On the Relationship Between Absolute Solar Cosmic Ray Intensity and Riometer Absorption

摘要

A study was made of eight separate solar cosmic ray events during 1960 using (a) observations above the atmosphere by satellite Explorer VII of the integral omnidirectional intensity of particles J sub o (E > E sub o), where E sub o is 30 MeV for protons and 120 MeV for alpha particles; and (b) corresponding riometer values of atmospheric absorption A of cosmic radio noise at 27.6 mc/sec from College and Thule stations. It is concluded that atmospheric absorption over the polar caps is often due predominantly to protons of energy less than 30 MeV and/or to alpha particles of energy less than 120 MeV; and that the spectral form in the vicinity of these values of energy varies greatly from event to event and tends to remain about the same or to become steeper (softer) with increasing time during a given event. (Author)