Anatomy of a Radiation Belt Flux Dropout

Details Anatomy of a Radiation Belt Flux Dropout Anatomy of a Radiation Belt Flux Dropout

Dec 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011agufmsm41b2026f&link_type=abstract

American Geophysical Union, Fall Meeting 2011, abstract #SM41B-2026

Physics

[2720] Magnetospheric Physics / Energetic Particles: Trapped, [2730] Magnetospheric Physics / Magnetosphere: Inner, [2740] Magnetospheric Physics / Magnetospheric Configuration And Dynamics

Scientific paper

During the period 30 June to 4 July 2011 an extended flux dropout of energetic electrons was observed by multiple GOES, HEO and GPS satellites. The GOES >2 MeV electron flux dropped by more than two orders of magnitude to background levels and remained at the reduced levels for about four days. The HEO observations indicate the >6.5, >3 MeV, >1.5 MeV, >0.23 flux reductions were observed down to L~4.8, 4.9, 5.1 and 5.6 respectively. The >320 keV proton fluxes were also observe to drop out down to L~ 5.5. At the time of the flux dropout the interplanetary conditions were relatively steady with low solar wind speed and ion density of ~10/cc. However Bz was <0 and Dst turned negative on 1 July at 02 UT reaching -49 nT by 08 UT. The recovery and duration of the flux dropouts were energy dependent with the hundreds of keV electron fluxes recovering within a day near geosynchronous while the >MeV electrons and >320 keV protons recovered slowly. Only the <500 keV electrons reached flux levels exceeding or approaching their pre dropout levels at HEO and then only in the L=4.5-5.2 range. These < 0.5 MeV flux enhancements were temporary, lasting about a day. The HEO observations show that the recovery of the relativistic electron fluxes proceeded slowly from low to higher L. The >8.5 MeV electrons and >320 keV proton fluxes observed by the HEO satellites had still not recovered to L~6.5 after 6-7 days. We will fold all the available data together from GOES, multiple HEO and GPS satellites plus low altitude observations to provide a comprehensive view of this dropout event.

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