Extreme flux enhancement of killer electrons due to the magnetosphere inflation during the recovery phase of geomagnetic storms

Details Extreme flux enhancement of killer electrons due to the magnetosphere inflation during the recovery phase of geomagnetic storms Extreme flux enhancement of killer electrons due to the magnetosphere inflation during the recovery phase of geomagnetic storms

Dec 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007agufmsm41a0317k&link_type=abstract

American Geophysical Union, Fall Meeting 2007, abstract #SM41A-0317

Physics

2101 Coronal Mass Ejections (7513), 2753 Numerical Modeling, 2774 Radiation Belts, 2784 Solar Wind/Magnetosphere Interactions, 7511 Coronal Holes

Scientific paper

Extreme flux enhancement of outer radiation belt electrons was observed during the recovery phase of a large magnetic storm on 27-30 July 2004. The storm main phase is driven by a very fast magnetic cloud of ~1000 km/s associated with a coronal mass ejection (CME). The high-speed stream of ~600 km/s originated from a coronal hole follows the magnetic cloud and the coronal hole stream (CHS) is rarefied due to the speed difference between the CME and CHS. During the storm recovery phase, the magnetosphere is surrounded by the very low- density CHS, causing an inflation of the magnetosphere. It is found that such a combination of the CME and CHS can be one of the most dangerous solar wind structures for the outer radiation belt, and the associated very low dynamic pressure can cause the magnetosphere inflation during the storm recovery phase as an excellent magnetic confinement of killer electrons. We report our space weather modeling effort to reproduce the magnetosphere inflation effect using a radiation belt simulation and a 3D-MHD solar wind simulation based on IPS observation.

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