Measurement of the solar diurnal anisotropy of the cosmic-ray albedo neutron flux

Abstract

The solar diurnal anisotropy of the cosmic-ray albedo neutron flux has been measured by a neutron detector on board the OGO-6 satellite. On the average the diurnal amplitudes and phases of the cosmic ray albedo neutron flux (_<10 MeV) were respectively 0.18 (+0.02)% and 15(+1) hr LT though there were substantial fluctuations of a few days duration which did not depend on the solar sector structure polarity and a 27-day periodicity in the diurnal amplitudes which was associated with the Sun's rotation.

Atmospheric Neutrons and Their Contributions to the Earth's Radiation Belts.

“…1. Comparison of the observed trapped proton flux at L=1.5 (FREDEN et at., 1965;FILLius and MCILWAI`N, 1964;VALOT, 1972) with that predicted by GRAND using the recent cosmic ray albedo neutron measurements (JENKINS et at., 1970(JENKINS et at., , 1971LocKwooD et at., 1973LocKwooD et at., , 1976IFEDILI 1972IFEDILI ,1982WHITE et at., 1972;KANBACH et at., 1974;PRESZLER et at., 1976). …”