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Journal Cover International Journal of Space Science and Engineering
  [3 followers]  Follow
    
   Hybrid Journal Hybrid journal (It can contain Open Access articles)
   ISSN (Print) 2048-8459 - ISSN (Online) 2048-8467
   Published by Inderscience Publishers Homepage  [412 journals]
  • Classification of cloud scenes by Argus spectral data
    • Authors: Rehan Siddiqui, Rajinder Jagpal, Naif Al Salem, Brendan M. Quine
      Pages: 295 - 311
      Abstract: The mini-spectrometer Argus 1000 being in space, continuously monitors the sources and sinks of the trace gases. This paper presents a methodology of classification of cloud scene by Argus Spectral Data (CCSArSD) by applying radiance enhancement (RE) technique within 900-1700 nm of wavelength bands at infrared sounder along with GENSPECT line by line radiative transfer code for different weeks per passes. Argus was launched on aboard CanX-2 micro-satellite on 28<SUP align="right">th</SUP> April 2008 as part of a technology demonstration mission. The algorithm describes a method to detect the cloudy or non-cloudy scenes. We have collected more than 300 weeks per passes with each have more than 200 spectra. The REi within the selected wavelength bands of Argus, provides a promising results to classify the cloud scene. We moreover worked on the shortwave upwelling radiative flux (W/m<SUP align="right">2</SUP>) to improve the CCSArSD model, which needs further study to jump up to higher rank.
      Keywords: radiance enhancement; remote sensing; radiative transfer; near infrared detectors; clouds; carbon retrieval; micro-spectrometer; cloudy scenes; Argus spectral data; trace gases
      Citation: International Journal of Space Science and Engineering, Vol. 3, No. 4 (2015) pp. 295 - 311
      PubDate: 2016-04-12T23:20:50-05:00
      DOI: 10.1504/IJSPACESE.2015.075911
      Issue No: Vol. 3, No. 4 (2016)
       
  • The high energy electromagnetic field generator
    • Authors: Rehan Siddiqui, Rajinder Jagpal, Naif Al Salem, Brendan M. Quine
      Pages: 312 - 317
      Abstract: The original concept described is named the high energy electromagnetic field generator. This concept's governing physics entail the coupling of gyration (high frequency spin), vibration (high frequency abrupt pulsations/harmonic oscillations) and possible curvilinear translation, of electrically charged systems. If we couple the system's high frequency of rotation (30,000 to 100,000 RPM, and higher) with high vibration (abrupt pulsations/harmonic oscillations) frequencies in the range of 10<SUP align="right">9</SUP> to<SUP align="right">10</SUP> Hertz (and above) we can obtain electromagnetic field intensity values in the range 10<SUP align="right">24</SUP> to 10<SUP align="right">28</SUP> Watts/m<SUP align="right">2</SUP> (and beyond). These extremely high electromagnetic field intensity values emphasise the novelty of this concept, especially suited for the design of energy generation machinery with power output levels much higher than those currently achievable. The utilisation of such high power sources for space power and propulsion generation, as it pertains to reduction in a spacecraft's inertial mass as a direct result of local vacuum polarisation, is an important application of the described theoretical concept. In this manner, extreme spacecraft speeds can be achieved.
      Keywords: faster than light travel; superluminal propulsion; quantum vacuum plasma; QVP; vacuum energy fluctuations; vacuum polarisation; spacetime manipulation; quantum vacuum engineering; quantum field theory; far from equilibrium thermodynamics; spatio-temporal e
      Citation: International Journal of Space Science and Engineering, Vol. 3, No. 4 (2015) pp. 312 - 317
      PubDate: 2016-04-12T23:20:50-05:00
      DOI: 10.1504/IJSPACESE.2015.075910
      Issue No: Vol. 3, No. 4 (2016)
       
  • Stabilisation of in-plane periodic motion of electrodynamic tether
           system by combining tether length control and current control
    • Authors: Hirohisa Kojima, Hidenori Aoki
      Pages: 318 - 341
      Abstract: A tether system is a large flexible structure connecting two or more satellites. Libration control methods of a tether system in elliptic orbits have been studied. For electrodynamic tether systems, these have included control of the tether length and the electric current. In previous studies, these two control methods were considered independently. However, by combining them, it is expected that the periodic motion of an electrodynamic tether system can be stabilised using a smaller electric current. The tether satellite system considered in the present study consists of two subsatellites and a mother satellite connected together in series via massless tethers. To stabilise the periodic motion using only a small electric current, two different tethers are used. The first is a non-electrodynamic tether whose length acceleration is varied using bang-bang control, and the other is an electrodynamic tether subject to proportional-derivative or delayed feedback control. The results of numerical simulations show that the proposed control scheme exhibits good performance for stabilising librational motion of the tether system to periodic motion, combining non-electrodynamic and electrodynamic tethers.
      Keywords: electrodynamic tethers; EDT; periodic motion; PD control; delayed feedback control; stabilisation; in-plane periodic motion; tether length control; current control; satellites; bang-bang control; numerical simulation
      Citation: International Journal of Space Science and Engineering, Vol. 3, No. 4 (2015) pp. 318 - 341
      PubDate: 2016-04-12T23:20:50-05:00
      DOI: 10.1504/IJSPACESE.2015.075915
      Issue No: Vol. 3, No. 4 (2016)
       
  • Hydrolysed polar terrain ice aerobot mission platform
    • Authors: Eric M. Shear, John E. Moores
      Pages: 342 - 359
      Abstract: HYPATIA is a proposed mission that would demonstrate the use of planetary balloon and water electrolysis technology on the Martian northern polar cap. The combination of both technologies allows a small science payload to be landed repeatedly and carried across the polar terrain. HYPATIA consists of a small gondola under a metallised Mylar balloon filled with hydrogen from the polar ice. This paper details the mission objectives and the science requirements. It describes the overall mission design and the science payload of the balloon vehicle.
      Keywords: mission concept; spacecraft design; ISRU; Mars; planetary balloons; water electrolysis; polar science; hydrolysed polar terrain; ice; aerobots
      Citation: International Journal of Space Science and Engineering, Vol. 3, No. 4 (2015) pp. 342 - 359
      PubDate: 2016-04-12T23:20:50-05:00
      DOI: 10.1504/IJSPACESE.2015.075918
      Issue No: Vol. 3, No. 4 (2016)
       
  • Analytical studies to visualise the geomagnetic storm conditions over
           different locations in the USA: Part 2
    • Authors: Eric M. Shear, John E. Moores
      Pages: 360 - 387
      Abstract: A-index data (from 1994 to 2013) obtained from Space Weather Prediction Center, NOAA, USA, are analysed statistically to visualise the variation in geomagnetic conditions over Fredericksburg (38.2047°N, 77.3729°W), College (64.8742°N, 147.8597°W) and Estimated Planetary in the USA. Year-to-year changes in percentage occurrence of different kind of geomagnetic storms have most prominently reflected over college, followed with estimated planetary. Fredericksburg has been accounted for least year-to-year changes in the percentage occurrence of different geomagnetic storm conditions during a month. Estimation of standard deviation quantify further the degree of year-to-year variability. These variations may be the key reason behind the drastic year-to-year changes in climatic conditions over the various region of this globe. These results may be proved useful in the areas of radio communication, civilaviation, navigation etc. It may also be helpful to incorporate essential measures while designing of electrical and electronics gadgets in order to save them from the severe effect of these storms.
      Keywords: percentage occurrence; A-indices; major geomagnetic storms; severe geomagnetic storms; USA; United States; visualisation; health hazards; geomagnetic conditions; electrical systems; electromagnetic systems; statistical analysis; Space Weather Prediction Cent
      Citation: International Journal of Space Science and Engineering, Vol. 3, No. 4 (2015) pp. 360 - 387
      PubDate: 2016-04-12T23:20:50-05:00
      DOI: 10.1504/IJSPACESE.2015.075922
      Issue No: Vol. 3, No. 4 (2016)
       
 
 
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