IMP8 Observations of the Relative Onset Times of Relativistic Electrons and Protons in the January 20, 2005 Ground Level Event

Details IMP8 Observations of the Relative Onset Times of Relativistic Electrons and Protons in the January 20, 2005 Ground Level Event IMP8 Observations of the Relative Onset Times of Relativistic Electrons and Protons in the January 20, 2005 Ground Level Event

May 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006agusmsh42a..02d&link_type=abstract

American Geophysical Union, Fall Meeting 2007, abstract #SH42A-02

Physics

Nuclear Physics

Nuclear Experiment

7513 Coronal Mass Ejections (2101), 7514 Energetic Particles (2114), 7519 Flares, 2101 Coronal Mass Ejections (7513), 2114 Energetic Particles (7514)

Scientific paper

Although the IMP8 mission officially ended in October 2001, IMP8 telemetry was fortuitously recovered during the onset of the January 20, 2005 ground level event (GLE). The University of Chicago's Cosmic Ray Nuclear Experiment (CRNE) on IMP8 showed a >4-sigma increase in the rate of relativistic (>2 MeV) electrons at 06:50 UT. This time was one minute later than the onset of relativistic protons, as reported at the South Pole Neutron Monitor Station. This modest delay, which is probably attributable to limited instrumental sensitivity, suggests a common acceleration mechanism for relativistic electrons and protons in this event. Our results differ from a recent report (G.M. Simnett, A&A 445, 715, 2006) using ACE/EPAM electron data, which inferred a ~6 minute delay between the emission of relativistic protons and near-relativistic (~260 keV) electrons, after correction for differences in particle speeds. The first arriving particles in IMP8/CRNE were also highly anisotropic and registered in the azimuthal spin-sector containing the nominal Parker spiral direction. This result also differs from the ACE/EPAM report, in which the first-arriving electrons were observed in a detector viewing the anti-Sunward direction. We discuss possible causes of the discrepancies with ACE/EPAM and potential implications of our observations.

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