Physics
Scientific paper
Dec 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011agufmsm12a..01l&link_type=abstract
American Geophysical Union, Fall Meeting 2011, abstract #SM12A-01
Physics
[2720] Magnetospheric Physics / Energetic Particles: Trapped, [2774] Magnetospheric Physics / Radiation Belts, [2784] Magnetospheric Physics / Solar Wind/Magnetosphere Interactions, [2788] Magnetospheric Physics / Magnetic Storms And Substorms
Scientific paper
It has been known for decades that the passage of high-speed solar wind correlates well with enhancements of radiation belt electrons in the magnetosphere. However an examination of fifteen years of continuous solar wind measurements and the daily averaged MeV electron fluxes at geosynchronous orbit shows that geomagnetic activity driven by a southward orientation of the interplanetary magnetic field, IMF, is a necessary condition for the MeV electron enhancement and that high-speed solar wind alone is neither necessary nor sufficient for the MeV electron enhancement. The reason that high-speed solar wind is almost always associated with the enhancement of MeV electrons is mainly because high-speed solar wind almost always has some southward components of the IMF. However, a combination of a long lasting high-speed solar wind and a southward oriented IMF produce highest fluxes of MeV electrons at geosynchronous orbit.
Baker Daniel N.
Li Xiaoliang
Reeves Geoff D.
Temerin Michael A.
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