Accession Number : AD0757754

Title :   Variability of Intensity Ratios of H to He and He to C,N,O in Energetic Solar Particle Events.

Descriptive Note : Progress rept.,

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

Personal Author(s) : Van Allen,J. A. ; Venkatarangan,P. ; Venkatesan,D.

Report Date : FEB 1973

Pagination or Media Count : 36

Abstract : Explorer 35 data on energetic solar particle events show that intensity ratios of H to He (p/alpha) and of He to Z > or = 3 ions (alpha/M) in the sub-MeV specific energy range (epsilon = or > 0.5 MeV/nucleon) vary from event to event and more especially during the time history of individual events. Ranges of observed values are 10 < p/alpha < 90 and 3 < alpha/M < 27. The interpretation emphasizes two interplanetary propagation effects as principally responsible for the observed variability of the intensity ratios of the various ionic species: (a) differential diffusion and (b) changes in intensity and spectra caused by reflection of diffusing particles by propagating magnetic discontinuities. (Author)

Descriptors :   (*SOLAR DISTURBANCES, COSMIC RAYS), HYDROGEN, HELIUM, CARBON, NITROGEN, OXYGEN, ISOTOPE AVAILABILITY, RADIATION MEASURING INSTRUMENTS, SCIENTIFIC SATELLITES

Subject Categories : Astrophysics

Distribution Statement : APPROVED FOR PUBLIC RELEASE