Are Pressure Variations in the Solar Wind Causally Related to Relativistic Electron Enhancements?

Details Are Pressure Variations in the Solar Wind Causally Related to Relativistic Electron Enhancements? Are Pressure Variations in the Solar Wind Causally Related to Relativistic Electron Enhancements?

May 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002agusmsm42a..09c&link_type=abstract

American Geophysical Union, Spring Meeting 2002, abstract #SM42A-09

Physics

2720 Energetic Particles, Trapped, 2752 Mhd Waves And Instabilities, 2784 Solar Wind/Magnetosphere Interactions

Scientific paper

Outer zone relativistic electrons in the Earth's magnetosphere are known to vary in response to the solar wind. One theory proposed for the acceleration of energetic electrons is that magnetospheric ULF waves resonantly accelerate these drifting electrons. There have also been some observations consistent with this proposal that show Pc5 wave power is enhanced during increased relativistic electron flux. However, the source of these oscillations has not been determined. Recently, Kepko et al. (2002) proposed that global magnetospheric ULF waves are driven directly by pressure waves in the solar wind. In this work, we test the combination of these proposals by investigating solar wind pressure variance in association with the variability of relativistic electron enhancements. We use data from the Solar Wind Experiment (SWE) on the Wind spacecraft together with data from the Proton/Electron Telescope (PET) on the Solar, Anomalous, and Magnetospheric Particle Explorer (SAMPEX) spacecraft. This comprehensive data set is used to explore the correlation between ULF pulsations and the appearance of relativistic electrons.

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