Global distributions of trapped he fluxes from OHZORA satellite during the geomagnetically quiet period of 1984—1987

Nobuyuki Hasebe, A. Ryowa, M. Kobayashi, K. Kondoh, J. Hamada, Y. Mishima, K. Nagata, K. Kohno, J. Kikuchi, T. Doke

Research output: Chapter in Book/Report/Conference proceedingChapter

1 Citation (Scopus)


We present the global distributions of trapped He (4.8-37 MeV) fluxes in the low altitude region under quiet-time conditions (|Dst| < 30 nT) of geomagnetic activity. Observations were obtained by the OHZORA satellite during 1984-1987 in the altitude of350-850km. We have compared the global distributions of He fluxes with those for trapped electrons and protons at the same altitudes. Auroral zones observed from energetic He are not so prominent as compared with those from electron and proton fluxes. It is found that the anomalous distributions of He fluxes are localized at the South Atlantic Anomaly, while the anomalous distributions of electron and proton fluxes are clearly seen to extend from South Atlantic region to Southern Anomaly. Further, the L-distributions of trapped He fluxes are also examined during quiet-time conditions. It is found that the distributions for lower energies (4.8-13MeV) have two peaks at L =~ 1.4 and ~ 2.7, while the distribution for higher energies (13-37 MeV) has a single peak at L ~ 1.5 and does not have the peak at L =~ 2.7.

Original languageEnglish
Title of host publicationRadiation Belts
Subtitle of host publicationModels and Standards, 1996
EditorsJ.F. Lemaire, D.N. Baker, D. Heynderickx
PublisherBlackwell Publishing Ltd
Number of pages4
ISBN (Electronic)9781118664261
ISBN (Print)9780875900797
Publication statusPublished - 1996 Jan 1
Externally publishedYes

Publication series

NameGeophysical Monograph Series
ISSN (Print)0065-8448
ISSN (Electronic)2328-8779


ASJC Scopus subject areas

  • Geophysics

Cite this

Hasebe, N., Ryowa, A., Kobayashi, M., Kondoh, K., Hamada, J., Mishima, Y., Nagata, K., Kohno, K., Kikuchi, J., & Doke, T. (1996). Global distributions of trapped he fluxes from OHZORA satellite during the geomagnetically quiet period of 1984—1987. In J. F. Lemaire, D. N. Baker, & D. Heynderickx (Eds.), Radiation Belts: Models and Standards, 1996 (pp. 255-258). (Geophysical Monograph Series; Vol. 97). Blackwell Publishing Ltd.