Radial variation of energy spectra of low-flux MeV protons aboard Helios in 1975-77

Details Radial variation of energy spectra of low-flux MeV protons aboard Helios in 1975-77 Radial variation of energy spectra of low-flux MeV protons aboard Helios in 1975-77

Aug 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001icrc....8.3108k&link_type=abstract

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

Physics

2

Scientific paper

Pulse height data obtained by the Univ. Kiel energetic particle telescopes aboard Helios 1 and 2 at very low-flux quiet activity periods during the 1975-77 solar minimum are analysed by using a statistical background reduction method. The energy spectra of protons in the energy range of 4-27 MeV exhibit systematic radial variation. The shape of the energy spectra exhibit little variation with radial distance. The results are compared with simultaneous IMP-8 data at the same solar activity minimum and SOHO measurements in 1996, respectively. The analysis allows determining the radial gradient of the low-flux population as well as comparing the absolute fluxes at the two minima thus providing information about the origin of the particles.

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