Acceleration of Magnetospheric Relativistic Electrons by Ultra-Low Frequency Waves: A Comparison Study

Details Acceleration of Magnetospheric Relativistic Electrons by Ultra-Low Frequency Waves: A Comparison Study Acceleration of Magnetospheric Relativistic Electrons by Ultra-Low Frequency Waves: A Comparison Study

May 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009agusmsm73a..07t&link_type=abstract

American Geophysical Union, Spring Meeting 2009, abstract #SM73A-07

Physics

2720 Energetic Particles: Trapped, 2752 Mhd Waves And Instabilities (2149, 6050, 7836), 2774 Radiation Belts, 2788 Magnetic Storms And Substorms (7954)

Scientific paper

In a statistical study O'Brien et al. [2001] showed that magnetospheric relativistic electrons (MRE) can be accelerated significantly during the recovery phase of a magnetic storm when there exists sustained solar wind speeds of > 450 km s-1 and long duration of Pc5 ULF activity. While this statistical result supports the general tendency for MRE's to depend on solar wind speeds and ULF activity, individual events can behave quite differently. For example, during the storm recovery phases on September 25, 2001 and November 25, 2001, when the solar wind speeds were > 600 kms-1, the MRE data measured by LANL and GOES spacecraft indicate a 4-fold and negligible increases of 1.1-1.5 MeV electrons during ~3-hour strong ULF wave activity periods as observed by Cluster spacecraft at noon and dusk, respectively. In this paper, we present detailed comparisons between these two events. Our results show that the main difference between the two events is a strong day-night asymmetry of ULF wave distributions in the September event in contrast with the uniform ULF wave distribution in the November event. O'Brien, T. P., et al., 2001, Which magnetic storms produce relativistic electrons at geosynchronous orbit? J. Geophys. Res., 106, 15,533.

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