Relativistic electron flux enhancement on October 28, 2003

Details Relativistic electron flux enhancement on October 28, 2003 Relativistic electron flux enhancement on October 28, 2003

Dec 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004agufmsm13a1190x&link_type=abstract

American Geophysical Union, Fall Meeting 2004, abstract #SM13A-1190

Physics

2716 Energetic Particles, Precipitating, 2720 Energetic Particles, Trapped, 2730 Magnetosphere: Inner, 2788 Storms And Substorms

Scientific paper

Abrupt enhancement of relativistic electron (E>2MeV) flux was observed by geosynchronous and polar orbit satellites at ~11:50 UT on Oct. 28, 2003 after an intense X17 solar x-ray burst at 11:10 UT. The relativistic electron enhancement occurred before the magnetic storm starting at 6:00 UT on the next day and was directly correlated with the Solar Energetic Particle (SEP) event in the upstream solar wind. Observations by SAMPEX (E>1MeV) and NOAA/POES (E>0.3MeV) polar satellites show that the abrupt electron enhancement extends across all high L-values (L>6) with no notable time difference. The increase of electron flux lasted for more than one day, with its peak being clearly in conjunction with the arrival of an interplanetary shock at the Earth. Obviously, these relativistic electrons were not accelerated by the varying electric fields in geospace associated with development of the storm. Measurements from ACE/EPAM and SOHO/COSTEP experiments indicated that the enhancement of energetic electron with energy being a few hundreds keV in the solar wind was seen simultaneously with the increase of relativistic electron flux at high L-values in the Earth. Therefore the observations presented in this paper strongly suggest that the MeV electrons in the solar wind may provide an additional source for the relativistic electron in the magnetosphere.

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