Physics
Scientific paper
Dec 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agufmsm53a1663c&link_type=abstract
American Geophysical Union, Fall Meeting 2008, abstract #SM53A-1663
Physics
2700 Magnetospheric Physics (6939), 2720 Energetic Particles: Trapped, 2774 Radiation Belts, 2788 Magnetic Storms And Substorms (7954), 2794 Instruments And Techniques
Scientific paper
The current phase of the solar cycle is characterized by long intervals between significant magnetic storms during which the trapped electron population decays and electron spectra harden significantly. Indeed, during the long recovery phase between storms a characteristic lower-energy (0.1 to 1.5 MeV) feature develops systematically as the magnetic equator is approached and is most significant at the lowest L-shell visited along the orbit of GPS satellites; such features have been reported previously for this region of the magnetosphere.1-4 Following the main phase of a magnetic storm a smooth featureless increase below about 1.5 MeV replaces the low-energy structure mentioned above -- a spectral characteristic of the electron population near the geostationary orbit. Electron spectral results at the magnetic equator from 9 Combined X-ray senor and Dosimeter instruments will be presented here for the small (55 nT) storm of 4 September 2008. 1. A. L. Vampola, J. B. Blake, and G. A. Paulikas, "A New Study of the Magentospheric Electron Environment," Journal of Spacecraft and Rockets 14, 690 (1977). 2. J. B. Reagan, R. W. Nightingale, E. E. Gaines, W. L. Imhof, and E. G. Stassinopoulos, "Outer Zone Energetic Electron Spectral Measurements," Journal of Spacecraft and Rockets 18, 83 (1981). 3. A. L. Vampola, "Solar Cycle Effects on Trapped Energetic Particles," Journal of Spacecraft and Rockets 26, 416 (1989). 4. W. D. Pesnell, "Fluxes of Relativistic Electrons in Low-Earth Orbit during the Decline of Solar Cycle 22," IEEE Transactions on Nuclear Science 48, 2016 (2001).
Cayton Thomas E.
Friedel Reiner H.
Varotsou Athina
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