Recurrent CIR-accelerated particle events observed by Stereo/SEPT

Details Recurrent CIR-accelerated particle events observed by Stereo/SEPT Recurrent CIR-accelerated particle events observed by Stereo/SEPT

May 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007agusmsh41a..04g&link_type=abstract

American Geophysical Union, Spring Meeting 2007, abstract #SH41A-04

Physics

2101 Coronal Mass Ejections (7513), 2102 Corotating Streams, 2114 Energetic Particles (7514), 2194 Instruments And Techniques

Scientific paper

The Solar Electron and Proton Telescope (SEPT), part of the IMPACT investigation onboard the twin STEREO spacecraft, is designed to measure energetic electrons from 30 to 400 keV and protons from 60 to 7000 keV. During January and February 2007, the solar activity was very low, and only three small solar energetic electron events were observed by SEPT on January 23-24. Under these extremely quiet conditions, the enhancements of energetic proton fluxes are characterized by series of low energy (<1 MeV) bursts originating in the Earth magnetosphere or the bow shock (upstream events) and by recurrent, several days long enhancements associated with corotating interaction regions (CIRs). During this period, two different high speed solar wind streams originating in coronal holes were present, and both of them produced recurrent series of energetic proton events. The first sequence of events was observed by SEPT in correlation with solar wind stream interfaces on January 1-2, January 29 and February 26. The second series was correlated with stream interfaces observed on January 15 and February 12. Multi-spacecraft observations of time-intensity histories and energy spectra during the events are presented and discussed.

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