Outer Radiation Belt Electron Specification using Solar Cycle of GPS Data

Details Outer Radiation Belt Electron Specification using Solar Cycle of GPS Data Outer Radiation Belt Electron Specification using Solar Cycle of GPS Data

May 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002agusmsm42a..11b&link_type=abstract

American Geophysical Union, Spring Meeting 2002, abstract #SM42A-11

Mathematics

Logic

2720 Energetic Particles, Trapped, 2730 Magnetosphere: Inner

Scientific paper

Particle data from a number of Global Positioning Satellites (GPS) are used to develop a climatology model for the outer radiation belt electron environment. The outer radiation belt electron (>1 MeV) population represents a significant hazard to spacecraft systems vulnerable to deep dielectric charging. It is thus important to be able to specify that radiation environment at a given time in terms of radiation alerts to spacecraft operators. It is also important to be able to specify the environment in a climatological (statistical) sense to facilitate spacecraft design. The specification of the outer belt electrons is particularly challenging because its flux intensity varies by several orders of magnitude both spatially and temporally. In particular, fluxes may rise and fall dramatically on the time scale of hours to days throughout a magnetic storm, and also show long-term variation trends over the 11-year solar cycle. Daily average particle count rates from multiple GPS spacecraft flying at different times throughout a complete solar cycle (1991-2001) are analyzed and binned in L-shell to provide continuous coverage of daily radial profiles. GPS data from 1991 are directly cross-calibrated with CRRES flux data. The temporal overlap in coverage within the GPS fleet of spacecraft enables particle data from all subsequent GPS spacecraft to be either directly or indirectly normalized to the 1991 GPS dataset. Statistical models are constructed that give the probability of occurrence of a given state of the outer radiation environment. Solar cycle trends are also delineated.

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