Intensity maps of MeV electrons and protons below the radiation belt

T. Kohno, K. Munakata, K. Nagata, H. Murakami, A. Nakamoto, Nobuyuki Hasebe, J. Kikuchi, T. Doke

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19 Citations (Scopus)


Global distributions of energetic electrons (0.19-3.2 MeV) and protons (0.64-35 MeV) are presented in the form of contour maps. The data were obtained by two identical energetic particle telescopes using ΔE × E solid state detectors on board the satellite OHZORA. The observed altitude range is 350-850 km, which is divided into three ranges for contour representation. Ten-degree meshes in longitude and latitude were used to obtain the intensity contours. A pitch angle distribution of J(α) = J(90) · sinn α with n = 5 is assumed in order to get the intensity whose pitch angle is perpendicular to the geomagnetic line of force. In the map of the highest altitude region, a "ridge" extending from the South Atlantic Anomaly to the Northern Hemisphere exists above Mexico. A contour map in the B-L diagram is also presented. Here we can see some discrepancies at L = 1.1-1.5 from the radiation environment model of NSSDC. The data analyzed here were obtained during three years from February 1984 to January 1987. No geomagnetic activity was concerned.

Original languageEnglish
Pages (from-to)483-490
Number of pages8
JournalPlanetary and Space Science
Issue number4
Publication statusPublished - 1990
Externally publishedYes

ASJC Scopus subject areas

  • Geophysics
  • Space and Planetary Science
  • Astronomy and Astrophysics


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