Accession Number : AD0658340

Title :   GEOMAGNETICALLY TRAPPED ALPHA PARTICLES.

Descriptive Note : Progress rept. for Jul 67,

Corporate Author : IOWA UNIV IOWA CITY DEPT OF PHYSICS AND ASTRONOMY

Personal Author(s) : Krimigis,S. M. ; Van Allen,J. A.

Report Date : JUL 1967

Pagination or Media Count : 74

Abstract : This paper reports results of an extensive search for geomagnetically trapped nuclei heavier than deuterons in the energy range 0.52 < or = E < or = 4 MeV/nucleon, an energy region which is roughly two orders of magnitude below the regions previously investigated. The presence of geomagnetically trapped alpha particles was established. The significance of these observations lies in the fact that, although the intensity and energy spectrum of trapped protons E sub p approximately equal or > 30 MeV can be reasonably accounted for on the basis of the cosmic ray albedo neutron hypothesis, protons of energy below 30 MeV and down to 0.1 MeV or less cannot possibly be attributed to the albedo-neutron source. Thus, the special motivation for study of trapped nuclei having Z > or = 2 is to provide a set of parameters on one or more 'tracer' components of the radiation belts for testing the validity of hypotheses on their origin and on the origin of the much more abundant proton component.

Descriptors :   (*ALPHA PARTICLES, MAGNETOSPHERE), (*SCIENTIFIC SATELLITES, VAN ALLEN RADIATION BELT), SOLAR WIND, GEOMAGNETISM, PROTONS, DEUTERONS, MAGNETIC STORMS, COSMIC RAYS, DETECTORS

Subject Categories : Atmospheric Physics

Distribution Statement : APPROVED FOR PUBLIC RELEASE