Accession Number : AD0669066

Title :   ATS-1 OMINIDIRECTIONAL SPECTROMETER.

Descriptive Note : Final rept.,

Corporate Author : AEROSPACE CORP EL SEGUNDO CALIF LAB OPERATIONS

Personal Author(s) : Paulikas,G. A. ; Blake,J. B. ; Freden,S. C. ; Imamoto,S. S.

Report Date : MAR 1968

Pagination or Media Count : 118

Abstract : The omnidirectional spectrometer on ATS-1 measures energetic electrons above four integral thresholds (>300 keV, >450 keV, >1.05 MeV, and >1.9 MeV) and energetic protons in two differential channels (5 to 21 MeV and 21 to 70 MeV) by means of solid-state detectors. Analysis of about nine months of electron data shows that during magnetically quiet or moderately disturbed times a diurnal variation in the electron fluxes exists, with the noon-to-midnight ratio being larger for the more energetic electron groups and also, on the average, being larger for magnetically disturbed days. Magnetic storms produce a great deal of fine structure in the electron fluxes, with changes occurring on the time scale of minutes. The effect of such storms is to disrupt the diurnal variation and to depress the electron fluxes. Recovery to pre-storm levels is an energy-dependent process proceeding more sharply for more energetic electrons. Recovery is not smooth, but proceeds in a stepwise fashion. Modulation of electron fluxes is seen on a six-to-eight-day scale; preliminary data show that these modulations are associated with the sector structure of the interplanetary field. Protons were detected associated with impulsive solar proton events of 28 January 1967, 14 February 1967, and 23 May 1967. (Author)

Descriptors :   (*SPECTROMETERS, MEASUREMENT), (*SCIENTIFIC SATELLITES, SPECTROMETERS), ELECTRON DENSITY, PROTONS, DETECTORS, MULTIPLE OPERATION, DIURNAL VARIATIONS, MAGNETIC STORMS, DETECTION, SOLAR RADIATION, MAGNETOSPHERE, SYNCHRONOUS SATELLITES, COMPUTER PROGRAMS, SOLAR FLARES, VAN ALLEN RADIATION BELT, INFRARED SPECTRA, MAGNETOMETERS

Subject Categories : Astrophysics
      Optics
      Unmanned Spacecraft

Distribution Statement : APPROVED FOR PUBLIC RELEASE