Physics
Scientific paper
Dec 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989jspro..26..416v&link_type=abstract
(AIAA, Aerospace Engineering Conference and Show, Los Angeles, CA, Feb. 14-16, 1989) Journal of Spacecraft and Rockets (ISSN 002
Physics
Energetic Particles, Geomagnetism, Solar Cycles, Spacecraft Design, Trapped Particles, Earth Magnetosphere, Magnetic Storms, Particle Flux Density, Particle Motion, Solar Activity, Solar Wind
Scientific paper
The energetic particle populations in the earth's magnetosphere, which are the result of geomagnetic activity and, ultimately, are due to solar activity, have a major impact on the operation and survival of spacecraft. Departures from the nominal in solar activity produce requirements for changes from the nominal in the design and operation of spacecraft. If the approaching solar maximum is a robust one, as is indicated by preliminary solar data, the energetic particle population can be expected to be in excess of that predicted by particle models such as AE8 and AP8, since those models include solar-cycle effects based on nonimal solar activity. In the event of a robust solar cycle, accelerated degradation of electronics and power systems, increased sensor background effects, and more frequent operational anomalies may be expected on spacecraft that were designed for a nominal solar cycle. This paper discusses the relationships between solar activity and geomagnetic activity and provides a short tutorial on the mechanisms by which the energetic particle environment is produced and modified by magnetic activity. As an aid to spacecraft systems design and mission planning, the paper also indicates the types of changes from a nominal energetic particle population that could be expected based on a robust solar cycle 22.
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