Back to Search Start Over

The quiet-time spectra of cosmic-ray electrons of energies between 10 and 200 MeV observed on OGO-5.

Authors :
L'Heureux, J
Fan, C. Y
Meyer, P
Source :
Astrophysical Journal. 171
Publication Year :
1972
Publisher :
United States: NASA Center for Aerospace Information (CASI), 1972.

Abstract

Measurement of spectra of cosmic-ray electrons of energies between 10 and 200 MeV over a one-year period starting 1968 March. The measurement was made with a detector system on board the OGO-5 satellite. The instrument consists of a solid-state dE/dx detector, a total-energy CsI detector, a gas Cerenkov threshold detector, and two scintillation guard counters. Time periods during which no solar-flare events were recorded were selected for the study. It was found that during these quiet periods there were numerous intensity variations of the electron flux. These variations, which are seen only below 25 MeV, do not show marked correlation with any solar or interplanetary-medium parameters. The flux of the electrons of energies above 25 MeV, on the other hand, showed a gradual decrease over the one-year period, paralleling the neutron monitor intensity. The parameter describing this long-term modulation is almost independent of the rigidity of the electrons in the reported energy range. The physical implication of the finding is discussed.

Subjects

Subjects :
Space Sciences

Details

Language :
English
Volume :
171
Database :
NASA Technical Reports
Journal :
Astrophysical Journal
Notes :
NGR-03-002-107, , NGL-14-001-005, , NAS5-11444, , NAS5-9096
Publication Type :
Report
Accession number :
edsnas.19720033053
Document Type :
Report
Full Text :
https://doi.org/10.1086/151287