Accession Number : AD0604197

Title :   ON THE RELATIONSHIP BETWEEN ABSOLUTE SOLAR COSMIC RAY INTENSITY AND RIOMETER ABSORPTION,

Corporate Author : IOWA STATE UNIV IOWA CITY

Personal Author(s) : Van Allen,J. A. ; Lin,W. C. ; Leinback,H.

Report Date : JUL 1964

Pagination or Media Count : 44

Abstract : 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)

Descriptors :   (*COSMIC RAYS, ABSORPTION), (*SOLAR RADIATION, COSMIC RAYS), ATMOSPHERES, PROTON BOMBARDMENT, ALPHA BOMBARDMENT, INTENSITY, EXTRATERRESTRIAL RADIO WAVES, POLAR REGIONS, NUCLEAR RADIATION SPECTROSCOPY, SCIENTIFIC SATELLITES

Distribution Statement : APPROVED FOR PUBLIC RELEASE