McNab, M. C.,
Co-Authors: J. F. Fennell, and J. B. Blake,
Title: Polar, HEO and SAMPEX Energetic Particle Observations of the July 14, 2000 Event.,
Reference: American Geophysical Union Meeting, San Francisco, 15-19 December, 2000.
Reference Type: Contributed Talk
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Abstract:
The Bastille day solar event of July 2000 was the largest such event in the ISTP/GGS era, from the energetic particle perspective. The flotilla of interplanetary and near-Earth satellites captured the temporal history of this event in great detail. For this presentation we focus on the near-Earth energetic particle observations from the Polar, SAMPEX and HEO satellites. The high altitude Polar and HEO satellites hang for hours over the northern polar regions while SAMPEX traverses both polar caps every 90 minutes. Both the Polar and HEO satellites captured the rise of the solar protons and the shock associated discontinuous flux changes near 1540 UT on July 14 and near 1500 UT on July 15. Significant structure was observed in the fluxes over the polar caps. For example, the greater than 20 MeV protons measured by HEO1 showed oscillatory fluxes following the July 14 shock passage. The Polar/HIST obtained relatively high resolution angular distributions of the 1 to 1! 0 MeV protons during the shock passage on 15 July when there was also significant structure in the proton fluxes. The HEO electron fluxes show evidence of strong ULF oscillations on July 16, extending throughout the inner magnetosphere. These occurred during the early recovery phase of the associated magnetic storm when the peak of the MeV electrons moved to lower L. SAMPEX observed the peak of the MeV electron fluxes to be as low as L = 2.8. This combined set of energetic particle observations will be presented in detail.
