The slope of the energy spectra of 10-200 MeV protons

Details The slope of the energy spectra of 10-200 MeV protons The slope of the energy spectra of 10-200 MeV protons

Aug 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001icrc...10.3988k&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

Energy spectra of protons in the 1-100 MeV range have been constructed from the observations of three energetic particle instruments aboard IMP-8, for near one hundred quiet-time periods between 1974 and 1991. The spectra were approximated by J(E)=A.E -γ +C.E ν , where the first term is responsible for solar particles and the second describes the galactic (and possibly anomalous) component. Theoretically, a value of ν=1 is expected in the low-energy (10-30 MeV) region where adiabatic cooling is predominant. Instead, in the majority of cases ν turns out significantly larger than unity. The distribution of ν was found to be slightly asymmetric with a peak around 1.2 and a shoulder below 1. ν does not exhibit any correlation with the other inferred parameters A and γ. Comparing ν with the count rates of the Deep River neutron monitor for the same time periods a slight positive correlation has been found. Theoretical implications and possible interpretations are discussed.

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