Physics
Scientific paper
Dec 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006agufmsm43b1487s&link_type=abstract
American Geophysical Union, Fall Meeting 2006, abstract #SM43B-1487
Physics
2716 Energetic Particles: Precipitating, 2720 Energetic Particles: Trapped, 2772 Plasma Waves And Instabilities (2471), 2774 Radiation Belts, 2784 Solar Wind/Magnetosphere Interactions
Scientific paper
Precipitation of relativistic (>1 MeV) electrons into the upper atmosphere is regularly observed by the Solar, Anomalous and Magnetospheric Particle Explorer (SAMPEX) satellite. Recent work suggests that the primary agent for one such form of precipitation, known as (relativistic electron) microburst precipitation, is resonant wave-particle interactions with chorus waves. During periods of enhanced solar wind activity, plasma sheet electrons are convected Earthward from the magnetotail, which then become unstable and excite chorus waves. These chorus waves can be Doppler shifted to the electron gyrofrequency and exchange energy and momentum with radiation belt electrons. This wave-particle interaction most effectively increases the energy and pitch angle of high pitch angle electrons, and scatters small pitch angle electrons into the loss cone. Thus these microbursts can be used as a proxy for acceleration of radiation belt electrons. In the present study we find that relativistic electron microbursts persist throughout the period when high solar wind velocity and enhanced Alfven wave activity are observed, which are indicative of enhanced chorus activity in association with a corotating interaction region. We compare the fluxes of trapped particles as measured by the HEO satellite, to those of microbursts observed on SAMPEX to evaluate the relative effectiveness of chorus in acceleration and loss of radiation belt particles during this period. The relevant data from October 2003 is presented and results are discussed in light of radiation-belt acceleration processes.
Bortnik Jacob
Mansergh Thorne Richard
Spittler Connie
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