Accession Number : AD0659480

Title :   OBSERVATIONS OF LOW ENERGY (0.5 MEV) TRAPPED PROTONS WITH INJUN IV.

Descriptive Note : Progress rept.,

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

Personal Author(s) : Krimigis,S. M.

Report Date : JUL 1967

Pagination or Media Count : 33

Abstract : Since the discovery of the low energy (of about 0.5 MeV) protons trapped in the geomagnetic field, several measurements have been reported on the intensities, angular distributions, energy spectra, and time variations of such protons. The present investigation extends the measurements to high latitudes (about 80 degrees) and low L values (L approximately = or > 1.1) with data obtained from the University of Iowa polar-orbiting Injun IV satellite. Constant intensity contours in absolute value of B - L space are presented for protons in the energy intervals 0.52 = or < Ep = or < 4 MeV and 0.90 = or < Ep = or < 1.8 MeV. The energy spectrum parameter Eo is computed as a function of L and it is shown that a major departure from the Eo proportional to 1/L cubed law is found for L approximately = or < 3.5 at absolute value of B = 0.19 gauss. Data are presented on the redistribution of protons in the radiation zones following the 17 April 1965 magnetic storm.

Descriptors :   (*PROTONS, *VAN ALLEN RADIATION BELT), (*SCIENTIFIC SATELLITES, SPACE ENVIRONMENTS), MAGNETIC STORMS, PROTON COUNTERS, PREDICTIONS, NUCLEAR RADIATION, DETECTORS, ALPHA PARTICLES, GEOMAGNETISM

Subject Categories : Atmospheric Physics
      Nuclear Physics & Elementary Particle Physics

Distribution Statement : APPROVED FOR PUBLIC RELEASE