High-energy solar protons seen by the APE-B telescope

Details High-energy solar protons seen by the APE-B telescope High-energy solar protons seen by the APE-B telescope

Aug 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001icrc....8.3177m&link_type=abstract

Proceedings of the 27th International Cosmic Ray Conference. 07-15 August, 2001. Hamburg, Germany. Under the auspices of the Int

Physics

Scientific paper

APE-B is one of two Alpha-Proton-Electron telescopes on the Wind spacecraft. It was designed to accept high-energy particles which enter the instrument from either direction. We use the penetrating particles, which traverse the entire telescope, to extend the energy spectra of protons from SEP events to several hundred MeV. Fluxes are compared with those seen by IMP-8 near 100 MeV to judge the quality of the instrument response model. While the response model requires further work, useful qualitative information can be obtained on spectral evolution in SEP events. This is illustrated by spectra for the early part of the Bastille Day 2000 flare, which show evidence of velocity dispersion. Because of the design of the data system, the instrument has returned pulse height information for very few particles heavier than protons during SEP events. The onboard software is being modified to give a higher priority to the penetrating events produced by alphas and heavier nuclei during future SEP events.

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