Forbush Decreases in the Cosmic-Ray Albedo Neutron Flux

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The Forbush decrease in the cosmic-ray albedo neutron flux has been measured by a neutron detector on board the OGO-6 satellite. For the events of June 7-10 and September 27-30, 1969, the Forbush decrease totalled 4.6 and 6% in amplitude respectively for the Mt. Washington neutron monitor (<I>P<SUB>c</SUB></I>=1.24 GV) while the respective depressions on the OGO-6 neutron rates in the polar region (<I>P<SUB>c</SUB></I> < 0.3 GV) were 5 and 9%. The depression in the OGO-6 neutron rates was larger at higher geomagnetic latitudes than at lower latitudes. These results indicate that Forbush decrease has greater effect on lower-energy charged particles, and that the phenomenon is reflected in the production of neutrons in the earth's atmosphere. However, it appears that the integrated effects of Forbush decreases on cosmic-ray albedo neutrons do not significantly decrease the CRAND source of charged particles in the radiation belt. For vertical cutoff rigidities <I>P<SUB>c</SUB></I>, < 1 GV, the total percent decrease in the OGO-6 neutron rates (≤10 MeV) during the Forbush decreases, 1969 June 7-10, September 27-30, and November 21-December 6 can be represented by -<I>mP<SUB>c</SUB></I>+<I>k</I>. Values of <I>m</I> and <I>k</I> are each constant for the particular Forbush decrease but increase with increasing Mt. Washington neutron monitor monthly average rates, an indication of a flattening of the rigidity dependence of Forbush decrease towards maximum solar modulation.

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  • Journal of geomagnetism and geoelectricity  

    Journal of geomagnetism and geoelectricity 48(8), 1025-1031, 1996-08 

    Society of Geomagnetism and Earth, Planetary and Space Sciences

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各種コード

  • NII論文ID(NAID)
    10002202109
  • NII書誌ID(NCID)
    AA00698879
  • 本文言語コード
    ENG
  • 資料種別
    ART
  • ISSN
    00221392
  • NDL 記事登録ID
    4079934
  • NDL 雑誌分類
    ZM41(科学技術--地球科学)
  • NDL 請求記号
    Z53-A457
  • データ提供元
    CJP書誌  NDL  J-STAGE 
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