Acceleration and extreme distortion within the Van Allen radiation belts during the "Halloween" solar storms of 2003

Details Acceleration and extreme distortion within the Van Allen radiation belts during the "Halloween" solar storms of 2003 Acceleration and extreme distortion within the Van Allen radiation belts during the "Halloween" solar storms of 2003

Dec 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004agufmsm11b..05m&link_type=abstract

American Geophysical Union, Fall Meeting 2004, abstract #SM11B-05

Physics

2720 Energetic Particles, Trapped, 2730 Magnetosphere: Inner, 2740 Magnetospheric Configuration And Dynamics, 2768 Plasmasphere, 2788 Storms And Substorms

Scientific paper

The center of the outer Van Allen radiation belt is usually about 20000 to 25000 km away from Earth. This belt of high-energy electrons that are trapped on magnetic field lines in near-Earth space was enhanced and driven into a highly unusual configuration during the recent solar activity in late October and November - known by scientists as the "Halloween Storm" of 2003. During and following the Halloween Storm, the Van Allen belt electron population was powerfully accelerated and redistributed inward. From November 1 to November 10, the outer belt had its center only about 10000 km from Earth's equatorial surface. As shown here using IMAGE spacecraft data, the Earth's ionized outer atmosphere (plasmasphere) was displaced inward (to an unprecedented degree) in October-November 2003, and concurrently the whole radiation belt structure was transformed. The region between the Van Allen belts, normally devoid of particles, became the location of highest radiation belt particle intensities. Such a remarkable deformation of the entire magnetosphere has not previously been witnessed and implies surprisingly powerful acceleration and loss processes deep within Earth's magnetosphere.

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