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  Subjects -> AERONAUTICS AND SPACE FLIGHT (Total: 124 journals)
Showing 1 - 30 of 30 Journals sorted alphabetically
Acta Astronautica     Hybrid Journal   (Followers: 223)
Advances in Aerospace Engineering     Open Access   (Followers: 74)
Advances in Aerospace Science and Technology     Open Access   (Followers: 14)
Advances in Astronautics Science and Technology     Hybrid Journal   (Followers: 3)
Advances in Space Research     Hybrid Journal   (Followers: 297)
Aeronautical Journal, The     Hybrid Journal   (Followers: 9)
Aerospace     Open Access   (Followers: 64)
Aerospace Medicine and Human Performance     Full-text available via subscription   (Followers: 22)
Aerospace Science and Technology     Hybrid Journal   (Followers: 309)
Aerospace Systems     Hybrid Journal   (Followers: 10)
Aerospace technic and technology     Open Access   (Followers: 7)
Aerotecnica Missili & Spazio : Journal of Aerospace Science, Technologies & Systems     Hybrid Journal   (Followers: 6)
AIAA Journal     Hybrid Journal   (Followers: 1006)
Air Medical Journal     Hybrid Journal   (Followers: 7)
Aircraft Engineering and Aerospace Technology     Hybrid Journal   (Followers: 142)
Artificial Satellites     Open Access   (Followers: 21)
ASTRA Proceedings     Open Access   (Followers: 3)
Astrodynamics     Hybrid Journal   (Followers: 4)
Aviation     Open Access   (Followers: 12)
Aviation in Focus - Journal of Aeronautical Sciences     Open Access   (Followers: 7)
Aviation Psychology and Applied Human Factors     Hybrid Journal   (Followers: 23)
Aviation Week     Full-text available via subscription   (Followers: 415)
Canadian Aeronautics and Space Journal     Full-text available via subscription   (Followers: 31)
CEAS Aeronautical Journal     Hybrid Journal   (Followers: 30)
Chinese Journal of Aeronautics     Open Access   (Followers: 19)
Ciencia y Poder Aéreo     Open Access   (Followers: 3)
Civil Aviation High Technologies     Open Access   (Followers: 6)
Control Systems     Hybrid Journal   (Followers: 239)
Cosmic Research     Hybrid Journal   (Followers: 5)
Egyptian Journal of Remote Sensing and Space Science     Open Access   (Followers: 25)
Fatigue of Aircraft Structures     Open Access   (Followers: 21)
Frontiers in Aerospace Engineering     Open Access   (Followers: 20)
Frontiers in Astronomy and Space Sciences     Open Access   (Followers: 15)
Gyroscopy and Navigation     Hybrid Journal   (Followers: 181)
IEEE Aerospace and Electronic Systems Magazine     Full-text available via subscription   (Followers: 254)
IEEE Journal on Miniaturization for Air and Space Systems     Hybrid Journal   (Followers: 2)
IEEE Transactions on Aerospace and Electronic Systems     Hybrid Journal   (Followers: 284)
IEEE Transactions on Circuits and Systems I: Regular Papers     Hybrid Journal   (Followers: 43)
International Journal of Aeroacoustics     Hybrid Journal   (Followers: 37)
International Journal of Aerodynamics     Hybrid Journal   (Followers: 46)
International Journal of Aeronautical and Space Sciences     Hybrid Journal   (Followers: 4)
International Journal of Aerospace Engineering     Open Access   (Followers: 86)
International Journal of Aerospace Innovations     Full-text available via subscription   (Followers: 23)
International Journal of Aerospace Psychology     Hybrid Journal   (Followers: 22)
International Journal of Aerospace Sciences     Open Access   (Followers: 36)
International Journal of Applied Geospatial Research     Hybrid Journal   (Followers: 7)
International Journal of Aviation Management     Hybrid Journal   (Followers: 5)
International Journal of Aviation Technology, Engineering and Management     Full-text available via subscription   (Followers: 8)
International Journal of Aviation, Aeronautics, and Aerospace     Open Access   (Followers: 9)
International Journal of Crashworthiness     Hybrid Journal   (Followers: 10)
International Journal of Micro Air Vehicles     Open Access   (Followers: 11)
International Journal of Satellite Communications Policy and Management     Hybrid Journal   (Followers: 15)
International Journal of Space Science and Engineering     Hybrid Journal   (Followers: 13)
International Journal of Space Structures     Full-text available via subscription   (Followers: 19)
International Journal of Space Technology Management and Innovation     Full-text available via subscription   (Followers: 11)
International Journal of Sustainable Aviation     Hybrid Journal   (Followers: 5)
Investigación Pecuaria     Open Access   (Followers: 1)
Journal of Aerodynamics     Open Access   (Followers: 27)
Journal of Aeronautical Materials     Open Access   (Followers: 10)
Journal of Aerospace Engineering     Full-text available via subscription   (Followers: 66)
Journal of Aerospace Engineering & Technology     Full-text available via subscription   (Followers: 22)
Journal of Aerospace Information Systems     Hybrid Journal   (Followers: 27)
Journal of Aerospace Information Systems     Hybrid Journal   (Followers: 57)
Journal of Aerospace Technology and Management     Open Access   (Followers: 10)
Journal of Aircraft     Hybrid Journal   (Followers: 267)
Journal of Aircraft and Spacecraft Technology     Open Access   (Followers: 15)
Journal of Airline and Airport Management     Open Access   (Followers: 11)
Journal of Astrobiology & Outreach     Open Access   (Followers: 5)
Journal of Aviation Technology and Engineering     Open Access   (Followers: 10)
Journal of Aviation/Aerospace Education & Research     Open Access   (Followers: 2)
Journal of Engineering and Technological Sciences     Open Access   (Followers: 2)
Journal of Guidance, Control, and Dynamics     Hybrid Journal   (Followers: 168)
Journal of KONBiN     Open Access   (Followers: 4)
Journal of Navigation     Hybrid Journal   (Followers: 180)
Journal of Propulsion and Power     Hybrid Journal   (Followers: 572)
Journal of Space Safety Engineering     Hybrid Journal   (Followers: 8)
Journal of Space Weather and Space Climate     Open Access   (Followers: 30)
Journal of Spacecraft and Rockets     Hybrid Journal   (Followers: 705)
Journal of Spatial Science     Hybrid Journal   (Followers: 4)
Journal of the American Helicopter Society     Full-text available via subscription   (Followers: 9)
Journal of the Astronautical Sciences     Hybrid Journal   (Followers: 11)
Journal of the Australasian Society of Aerospace Medicine     Open Access   (Followers: 3)
Journal of Wind Engineering and Industrial Aerodynamics     Hybrid Journal   (Followers: 21)
Life Sciences in Space Research     Hybrid Journal   (Followers: 5)
MAD - Magazine of Aviation Development     Open Access   (Followers: 3)
Mekanika : Jurnal Teknik Mesin i     Open Access  
Microgravity Science and Technology     Hybrid Journal   (Followers: 3)
New Space     Hybrid Journal   (Followers: 6)
Nonlinear Dynamics     Hybrid Journal   (Followers: 19)
npj Microgravity     Open Access   (Followers: 3)
Open Aerospace Engineering Journal     Open Access   (Followers: 4)
Perspectives of Earth and Space Scientists i     Open Access   (Followers: 1)
Population Space and Place     Hybrid Journal   (Followers: 10)
Problemy Mechatroniki. Uzbrojenie, lotnictwo, inżynieria bezpieczeństwa / Problems of Mechatronics. Armament, Aviation, Safety Engineering     Open Access   (Followers: 3)
Proceedings of the Human Factors and Ergonomics Society Annual Meeting     Hybrid Journal   (Followers: 16)
Proceedings of the Institution of Mechanical Engineers Part G: Journal of Aerospace Engineering     Hybrid Journal   (Followers: 42)
Progress in Aerospace Sciences     Full-text available via subscription   (Followers: 82)
Propulsion and Power Research     Open Access   (Followers: 89)
REACH - Reviews in Human Space Exploration     Full-text available via subscription   (Followers: 5)
Research & Reviews : Journal of Space Science & Technology     Full-text available via subscription   (Followers: 20)
RocketSTEM     Free   (Followers: 5)
Russian Aeronautics (Iz VUZ)     Hybrid Journal   (Followers: 23)
Science and Education : Scientific Publication of BMSTU     Open Access   (Followers: 1)
Space and Polity     Hybrid Journal   (Followers: 6)
Space Policy     Hybrid Journal   (Followers: 30)
Space Research Today     Full-text available via subscription   (Followers: 43)
Space Safety Magazine     Free   (Followers: 50)
Space Science International     Open Access   (Followers: 119)
Space Science Reviews     Hybrid Journal   (Followers: 92)
SpaceNews     Free   (Followers: 782)
Spatial Information Research     Hybrid Journal   (Followers: 1)
Transactions on Aerospace Research     Open Access   (Followers: 1)
Transport and Aerospace Engineering     Open Access   (Followers: 4)
Transportmetrica A : Transport Science     Hybrid Journal   (Followers: 7)
Unmanned Systems     Hybrid Journal   (Followers: 4)
Xibei Gongye Daxue Xuebao / Journal of Northwestern Polytechnical University     Open Access  
Вісник Національного Авіаційного Університету     Open Access   (Followers: 1)

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ASTRA Proceedings
Number of Followers: 3  

  This is an Open Access Journal Open Access journal
ISSN (Print) 2199-3955 - ISSN (Online) 2199-3963
Published by Copernicus Publications Homepage  [54 journals]
  • Cross-field transport and pitch-angle anisotropy of solar energetic
           particles in MHD turbulence

    • Abstract: Cross-field transport and pitch-angle anisotropy of solar energetic particles in MHD turbulence
      F. Fraschetti
      ASTRA Proc., 2, 63-65, https://doi.org/10.5194/ap-2-63-2016, 2016
      Recent measurements of solar energetic particles (SEPs) by multi-spacecraft fleet at 1 AU in various energy ranges are compatible with a not-vanishing first-order anisotropy in pitch-angle of the particles phase-space distribution. By using an analytic model for the time-dependent perpendicular transport, we calculate the effect of an inhomogeneous magnetic turbulence on pitch-angle anisotropy. We find that the transport coefficient scales differently from previous transport models.
      PubDate: 2016-01-15T07:11:21+01:00
  • Gamma-ray emitting supernova remnants as the origin of Galactic cosmic

    • Abstract: Gamma-ray emitting supernova remnants as the origin of Galactic cosmic rays
      M. Kroll, J. Becker Tjus, B. Eichmann, and N. Nierstenhöfer
      ASTRA Proc., 2, 57-62, https://doi.org/10.5194/ap-2-57-2015, 2015
      It is generally believed that the cosmic ray spectrum below the knee is ofGalactic origin, although the exact sources making up the entire cosmic rayenergy budget are still unknown. Including effects of magnetic amplification,Supernova Remnants (SNR) could be capable of accelerating cosmic rays up to afew PeV and they represent the only source class with a sufficientnon-thermal energy budget to explain the cosmic ray spectrum up to the knee.Now, gamma-ray measurements of SNRs for the first time allow to derive thecosmic ray spectrum at the source, giving us a first idea of the concrete,possible individual contributions to the total cosmic ray spectrum. In thiscontribution, we use these features as input parameters for propagatingcosmic rays from its origin to Earth using GALPROP in order to investigate ifthese supernova remnants reproduce the cosmic ray spectrum and if supernovaremnants in general can be responsible for the observed energy budget.
      PubDate: 2015-11-12T07:11:21+01:00
  • A solution to the cosmic ray anisotropy problem

    • Abstract: A solution to the cosmic ray anisotropy problem
      P. Mertsch and S. Funk
      ASTRA Proc., 2, 51-55, https://doi.org/10.5194/ap-2-51-2015, 2015
      Observations of the cosmic ray (CR) anisotropy are widely advertised as ameans of finding nearby sources. This idea has recently gained currency afterthe discovery of a rise in the positron fraction and is the goal of currentexperimental efforts, e.g., with AMS-02 on the International Space Station.Yet, even the anisotropy observed for hadronic CRs is notunderstood, in the sense that isotropic diffusion models overpredictthe dipole anisotropy in the TeV–PeV range by almost two orders ofmagnitude. Here, we consider two additional effects normally not consideredin isotropic diffusion models: anisotropic diffusion due to the presence of abackground magnetic field and intermittency effects of the turbulent magneticfields. We numerically explore these effect by tracking test-particlesthrough individual realisations of the turbulent field. We conclude that alarge misalignment between the CR gradient and the background field canexplain the observed low level of anisotropy.
      PubDate: 2015-10-08T07:11:21+02:00
  • The power spectrum of cosmic ray arrival directions

    • Abstract: The power spectrum of cosmic ray arrival directions
      M. Ahlers
      ASTRA Proc., 2, 45-49, https://doi.org/10.5194/ap-2-45-2015, 2015
      Various experiments show that the arrival directions of multi-TeV cosmic raysshow significant anisotropies at small angular scales. It was recently arguedthat this small scale structure may arise naturally by cosmic ray diffusionin a large-scale cosmic ray gradient in combination with deflections in localturbulent magnetic fields. We show via analytical and numerical methods thatthe non-trivial power spectrum in this setup is a direct consequence ofLiouville's theorem and can be related to properties of relative diffusion.
      PubDate: 2015-10-07T07:11:21+02:00
  • The large-scale anisotropy with the PAMELA calorimeter

    • Abstract: The large-scale anisotropy with the PAMELA calorimeter
      A. Karelin, O. Adriani, G. Barbarino, G. Bazilevskaya, R. Bellotti, M. Boezio, E. Bogomolov, M. Bongi, V. Bonvicini, S. Bottai, A. Bruno, F. Cafagna, D. Campana, R. Carbone, P. Carlson, M. Casolino, G. Castellini, C. De Donato, C. De Santis, N. De Simone, V. Di Felice, V. Formato, A. Galper, S. Koldashov, S. Koldobskiy, S. Krut'kov, A. Kvashnin, A. Leonov, V. Malakhov, L. Marcelli, M. Martucci, A. Mayorov, W. Menn, M. Mergé, V. Mikhailov, E. Mocchiutti, A. Monaco, N. Mori, R. Munini, G. Osteria, F. Palma, B. Panico, P. Papini, M. Pearce, P. Picozza, M. Ricci, S. Ricciarini, R. Sarkar, M. Simon, V. Scotti, R. Sparvoli, P. Spillantini, Y. Stozhkov, A. Vacchi, E. Vannuccini, G. Vasilyev, S. Voronov, Y. Yurkin, G. Zampa, and N. Zampa
      ASTRA Proc., 2, 35-37, https://doi.org/10.5194/ap-2-35-2015, 2015
      The large-scale anisotropy (or the so-called star-diurnal wave) has beenstudied using the calorimeter of the space-born experiment PAMELA. The cosmicray anisotropy has been obtained for the Southern and Northern hemispheressimultaneously in the equatorial coordinate system for the time period2006–2014. The dipole amplitude and phase have been measured for energies1–20 TeV n-1.
      PubDate: 2015-10-02T07:11:21+02:00
  • Cosmic ray transport and anisotropies to high energies

    • Abstract: Cosmic ray transport and anisotropies to high energies
      P. L. Biermann, L. I. Caramete, A. Meli, B. N. Nath, E.-S. Seo, V. de Souza, and J. Becker Tjus
      ASTRA Proc., 2, 39-44, https://doi.org/10.5194/ap-2-39-2015, 2015
      Using the data from the Interstellar Medium (ISM) we propose a physical model for the spectrum of the magnetic irregularities in the ISM. With this model we discuss the Galactic Cosmic Ray (GCR) spectrum, as well as the extragalactic Ultra High Energy Cosmic Rays (UHECRs), their chemical abundances and anisotropies. UHECRs may include a proton component from many radio galaxies integrated over vast distances, visible already below 3 EeV.
      PubDate: 2015-10-02T07:11:21+02:00
  • The cosmic ray anisotropy below 1015 eV

    • Abstract: The cosmic ray anisotropy below 1015 eV
      G. Di Sciascio
      ASTRA Proc., 2, 27-33, https://doi.org/10.5194/ap-2-27-2015, 2015
      The measurement of the anisotropy in the cosmic ray (CR) arrival directiondistribution provides important informations on the propagation mechanismsand on the identification of their sources. In the last decade the anisotropycame back to the attention of the scientific community, thanks to several newtwo-dimensional representations of the CR arrival direction distributionwhich clearly showed the existence of anisotropies at different angularscales in both hemispheres. The origin of the observed anisotropies is stillunknown. So far, no theory of CRs in the Galaxy exists yet to explain theobservations leaving the standard model of CRs and that of the local magneticfield unchanged at the same time. In this paper the observations of GalacticCR anisotropy will be briefly summarized, with particular attention to theresults obtained by the ARGO-YBJ experiment in the Northern Hemisphere.
      PubDate: 2015-09-29T07:11:21+02:00
  • Diffuse synchrotron emission from galactic cosmic ray electrons

    • Abstract: Diffuse synchrotron emission from galactic cosmic ray electrons
      G. Di Bernardo, D. Grasso, C. Evoli, and D. Gaggero
      ASTRA Proc., 2, 21-26, https://doi.org/10.5194/ap-2-21-2015, 2015
      Magnetic fields permeate the interstellar medium (ISM), extending far beyond the Galactic disc. The non-thermal phenomena, like e.g. the Galactic radio emission is doubtless a viable method of observation to clearly delineate the magnetic structure of our Galaxy.In this regard, the aim addressed in this contribution is to simulate the polarized Galactic synchrotron emission, due to the diffuse radiation by charged relativistic particles, at all relevant frequencies, 10 MHz up to 100 GHz.
      PubDate: 2015-09-22T07:11:21+02:00
  • Search for a positron anisotropy with PAMELA experiment

    • Abstract: Search for a positron anisotropy with PAMELA experiment
      B. Panico, O. Adriani, G. C. Barbarino, G. A. Bazilevskaya, R. Bellotti, M. Boezio, E. A. Bogomolov, M. Bongi, V. Bonvicini, S. Bottai, A. Bruno, F. Cafagna, D. Campana, P. Carlson, M. Casolino, G. Castellini, C. De Donato, C. De Santis, N. De Simone, V. Di Felice, V. Formato, A. M. Galper, U. Giaccari, A. V. Karelin, S. V. Koldashov, S. Koldobskiy, S. Y. Krutkov, A. N. Kvashnin, A. Leonov, V. Malakhov, L. Marcelli, M. Martucci, A. G. Mayorov, W. Menn, M. Mergé, V. V. Mikhailov, E. Mocchiutti, A. Monaco, N. Mori, R. Munini, G. Osteria, F. Palma, M. Pearce, P. Picozza, M. Ricci, S. B. Ricciarini, R. Sarkar, V. Scotti, M. Simon, R. Sparvoli, P. Spillantini, Y. I. Stozhkov, A. Vacchi, E. Vannuccini, G. I. Vasilyev, S. A. Voronov, Y. T. Yurkin, G. Zampa, and N. Zampa
      ASTRA Proc., 2, 17-20, https://doi.org/10.5194/ap-2-17-2015, 2015
      The PAMELA experiment has been collecting data since 2006; its resultsindicate a rise in the positron fraction with respect to the sum of electronsand positrons in the cosmic-ray (CR) spectrum above 10 GeV. This excess canbe due to additional sources, as SNRs or pulsars, which can lead to ananisotropy in the local CR positron, detectable from current experiments. Wereport on the analysis on spatial distributions of positron events collectedby PAMELA, taking into account also the geomagnetic field effects. Nosignificant deviation from the isotropy has been observed.
      PubDate: 2015-09-09T07:11:21+02:00
  • A Consistent Scenario for the IBEX Ribbon, Anisotropies in TeV Cosmic
           Rays, and the Local Interstellar Medium

    • Abstract: A Consistent Scenario for the IBEX Ribbon, Anisotropies in TeV Cosmic Rays, and the Local Interstellar Medium
      N. A. Schwadron, P. Frisch, F. C. Adams, E. R. Christian, P. Desiati, H. O. Funsten, J. R. Jokipii, D. J. McComas, E. Moebius, and G. Zank
      ASTRA Proc., 2, 9-16, https://doi.org/10.5194/ap-2-9-2015, 2015
      We develop a simple diffusive model of the propagation of cosmic rays and the associated cosmic ray anisotropy due to cosmic ray streaming against the local interstellar flow. We show that the local plasma and field conditions sampled by IBEX provide characteristics that consistently explain TeV cosmic ray anisotropies. These results support models that place the interstellar magnetic field direction near the center of the IBEX ribbon.
      PubDate: 2015-09-08T07:11:21+02:00
  • Observation of the Cosmic-Ray Shadow of the Moon and Sun with IceCube

    • Abstract: Observation of the Cosmic-Ray Shadow of the Moon and Sun with IceCube
      F. Bos, F. Tenholt, J. Becker Tjus, and S. Westerhoff
      ASTRA Proc., 2, 5-8, https://doi.org/10.5194/ap-2-5-2015, 2015
      Moon shadow analyses are standard methods to calibrate cosmic-ray detectors.We report on a three-year observation of cosmic-ray Moon and Sun shadows indifferent detector configurations. The cosmic-ray Moon shadow was observedwith high statistical significance (> 6σ) in previous analyses when theIceCube detector operated in a smaller configuration before it was completedin December 2010. This work shows first analyses of the cosmic-ray Sun shadowin IceCube. A binned analysis in one-dimension is used to measure the Moonand Sun shadow with high statistical significance greater than 12σ.
      PubDate: 2015-08-05T07:11:21+02:00
  • The Local Bubble as a cosmic-ray isotropizer

    • Abstract: The Local Bubble as a cosmic-ray isotropizer
      I. Gebauer, M. Weinreuter, S. Kunz, and D. Gaggero
      ASTRA Proc., 2, 1-3, https://doi.org/10.5194/ap-2-1-2015, 2015
      The Sun resides in the so-called Local Bubble, an underdense region, embedded in a dense wall of molecular clouds. This structure is expected to act as an efficient cosmic-ray isotropizer. Using realistic assumptions on the impact of the Local Bubble on cosmic-ray diffusion, we demonstrate that the Local Bubble can dilute the directional information of energetic positrons and electrons in cosmic rays.
      PubDate: 2015-07-31T07:11:21+02:00
  • TeV Cosmic Ray Anisotropy and the Heliospheric Magnetic Field

    • Abstract: TeV Cosmic Ray Anisotropy and the Heliospheric Magnetic Field
      P. Desiati and A. Lazarian
      ASTRA Proc., 1, 65-71, https://doi.org/10.5194/ap-1-65-2014, 2014
      Cosmic rays are observed to possess a small non uniform distribution in arrival direction. Such anisotropyappears to have a roughly consistent topology between tens of GeV and hundreds of TeV, with asmooth energy dependency on phase and amplitude.Above a few hundreds of TeV a sudden change in the topology of the anisotropyis observed. The distribution of cosmic ray sources in the Milky Way isexpected to inject anisotropy on the cosmic ray flux. The nearest and mostrecent sources, in particular, are expected to contribute more significantlythan others. Moreover the interstellar medium is expected to have differentcharacteristics throughout the Galaxy, with different turbulent propertiesand injection scales. Propagation effects in the interstellar magnetic fieldcan shape the cosmic ray particle distribution as well. In particular, in the1–10 TeV energy range, they have a gyroradius comparable to the size of theHeliosphere, assuming a typical interstellar magnetic field strength of 3 μG.Therefore they are expected to be strongly affected by theHeliosphere in a manner ordered by the direction of the local interstellarmagnetic field and of the heliotail. In this paper we discuss on thepossibility that TeV cosmic rays arrival distribution might be significantlyredistributed as they propagate through the Heliosphere.
      PubDate: 2014-10-31T07:11:21+01:00
  • Effects of stellar evolution and ionizing radiation on the environments of
           massive stars

    • Abstract: Effects of stellar evolution and ionizing radiation on the environments of massive stars
      J. Mackey, N. Langer, S. Mohamed, V. V. Gvaramadze, H. R. Neilson, and D. M.-A. Meyer
      ASTRA Proc., 1, 61-63, https://doi.org/10.5194/ap-1-61-2014, 2014
      We discuss two important effects for the astrospheres of runaway stars: thepropagation of ionizing photons far beyond the astropause, and the rapidevolution of massive stars (and their winds) near the end of their lives. Hotstars emit ionizing photons with associated photoheating that has asignificant dynamical effect on their surroundings. 3-D simulations show thatH ii regions around runaway O stars drive expanding conical shellsand leave underdense wakes in the medium they pass through. For late O starsthis feedback to the interstellar medium is more important than that fromstellar winds. Late in life, O stars evolve to cool red supergiants morerapidly than their environment can react, producing transient circumstellarstructures such as double bow shocks. This provides an explanation for thebow shock and linear bar-shaped structure observed around Betelgeuse.
      PubDate: 2014-09-11T07:11:21+02:00
  • MHD flows at astropauses and in astrotails

    • Abstract: MHD flows at astropauses and in astrotails
      D. H. Nickeler, T. Wiegelmann, M. Karlický, and M. Kraus
      ASTRA Proc., 1, 51-60, https://doi.org/10.5194/ap-1-51-2014, 2014
      The geometrical shapes and the physical properties of stellar wind –interstellar medium interaction regions form an important stage for studyingstellar winds and their embedded magnetic fields as well as cosmic raymodulation. Our goal is to provide a proper representation and classificationof counter-flow configurations and counter-flow interfaces in the frame offluid theory. In addition we calculate flows and large-scale electromagneticfields based on which the large-scale dynamics and its role as possiblebackground for particle acceleration, e.g., in the form of anomalous cosmicrays, can be studied. We find that for the definition of the boundaries,which are determining the astropause shape, the number and location ofmagnetic null points and stagnation points is essential. Multipleseparatrices can exist, forming a highly complex environment for theinterstellar and stellar plasma. Furthermore, the formation of extended tailstructures occur naturally, and their stretched field and streamlines providesurroundings and mechanisms for the acceleration of particles byfield-aligned electric fields.
      PubDate: 2014-09-05T07:11:21+02:00
  • Lyman-α observations of astrospheres

    • Abstract: Lyman-α observations of astrospheres
      J. L. Linsky and B. E. Wood
      ASTRA Proc., 1, 43-49, https://doi.org/10.5194/ap-1-43-2014, 2014
      Charge-exchange reactions between outflowing stellar wind protons andinterstellar neutral hydrogen atoms entering a stellar astrosphere produce aregion of piled-up-decelerated neutral hydrogen called the hydrogen wall.Absorption by this gas, which is observed in stellar Lyman-α emissionlines, provides the only viable technique at this time for measuring themass-loss rates of F–M dwarf stars. We describe this technique, present analternative way for understanding the relation of mass-loss rate with X-rayemission, and identify several critical issues.
      PubDate: 2014-08-25T07:11:21+02:00
  • Clumps in stellar winds

    • Abstract: Clumps in stellar winds
      J. S. Vink
      ASTRA Proc., 1, 39-41, https://doi.org/10.5194/ap-1-39-2014, 2014
      We discuss the origin and quantification of wind clumping and mass–lossrates (Ṁ), particularly in close proximity to the Eddington(Γ) limit, relevant for very massive stars (VMS). We present evidencethat clumping may not be the result of the line-deshadowing instability(LDI), but that clumps are already present in the stellar photosphere.
      PubDate: 2014-07-30T07:11:21+02:00
  • Observations of the anisotropy of cosmic rays at TeV–PeV

    • Abstract: Observations of the anisotropy of cosmic rays at TeV–PeV
      S. BenZvi
      ASTRA Proc., 1, 33-37, https://doi.org/10.5194/ap-1-33-2014, 2014
      During the past decade, multiple observatories have reported significantobservations of the anisotropy of cosmic rays in the TeV energy band. Theanisotropy has been observed at large scales and small scales in both theNorthern and Southern Hemispheres. The source of the anisotropy is notwell-understood, though both a galactic and a heliospheric origin have beensuggested. We discuss recent observations of the shape and energy dependenceof the anisotropy, with particular attention to measurements by the IceCubeNeutrino Observatory in the Southern Hemisphere and the Milagro andHigh-Altitude Water Cherenkov (HAWC) observatories in the NorthernHemisphere.
      PubDate: 2014-07-25T07:11:21+02:00
  • Cosmic rays as regulators of molecular cloud properties

    • Abstract: Cosmic rays as regulators of molecular cloud properties
      M. Padovani, P. Hennebelle, and D. Galli
      ASTRA Proc., 1, 23-27, https://doi.org/10.5194/ap-1-23-2014, 2014
      Cosmic rays are the main agents in controlling the chemical evolution andsetting the ambipolar diffusion time of a molecular cloud. We summarise theprocesses causing the energy degradation of cosmic rays due to theirinteraction with molecular hydrogen, focusing on the magnetic effects thatinfluence their propagation. Making use of magnetic field configurationsgenerated by numerical simulations, we show that the increase of the fieldline density in the collapse region results in a reduction of the cosmic-rayionisation rate. As a consequence the ionisation fraction decreases,facilitating the decoupling between the gas and the magnetic field.
      PubDate: 2014-06-27T07:11:21+02:00
  • Cosmic ray particles from exploding massive stars with winds

    • Abstract: Cosmic ray particles from exploding massive stars with winds
      P. L. Biermann
      ASTRA Proc., 1, 29-31, https://doi.org/10.5194/ap-1-29-2014, 2014
      The origin of cosmic rays is still unsettled. Many sources have been proposedover the years, and exploding stars still provide the most promisingcandidates. Here we examine one of these scenarios, and compare the resultingpredictions with data: Massive stars have winds, and when these starsexplode, the resulting shock runs through the wind. The observable phenomenonis called radio-supernova, and many have been observed in non-thermal radioemission. This emission allows to determine the magnetic field in the wind asa function of radius, and so allows to check, whether such explosions canachieve the high energies required and also explain the flux and the spectraof cosmic rays. The observations show this to be the case, and so we concludethat radio supernovae can explain the high-energy Galactic cosmic rays overthe entire energy range, and that the spectral predictions are compatiblewith observations.
      PubDate: 2014-06-27T07:11:21+02:00
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