Outer electron radiation belt evolution during weak high-speed solar-wind streams (HSSs): Density, temperature, and flux

Details Outer electron radiation belt evolution during weak high-speed solar-wind streams (HSSs): Density, temperature, and flux Outer electron radiation belt evolution during weak high-speed solar-wind streams (HSSs): Density, temperature, and flux

Dec 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011agufmsm24a..05d&link_type=abstract

American Geophysical Union, Fall Meeting 2011, abstract #SM24A-05

Physics

[2774] Magnetospheric Physics / Radiation Belts

Scientific paper

Electrons in the Earth's outer radiation belt are known to correlate strongly with the duration of elevated solar wind velocity. During the recent solar minimum the outer radiation belt was repeatedly enhanced following the arrival of a number of high-speed solar-wind streams (HSSs) at the magnetopause. These events were particularly 'weak' in comparison to HSSs during the earlier declining phase - the streams were of shorter duration, with lower maximum wind speeds. We present a superposed epoch study of 15 weak HSS-driven storms and examine the evolution of the outer radiation belt and the plasma sheet before, during, and after the storm onset. Our results indicate that the flux, density, and temperature of the outer electron radiation belt all increased to levels equal or in excess of those during earlier 'stronger' HSSs. We discuss possible reasons for this in terms of the system-response to HSSs.

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