1998 Fiscal Year Final Research Report Summary
The study of the precursory decrease of cosmic rays before the Forbush decrease.
| Project/Area Number |
09640531
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Space and upper atmospheric physics
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| Research Institution | Nagoya University |
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Principal Investigator |
FUJIMOTO Kazuhiko Solar-Terrestrial Environment Laboratory, Nagoya University, Assistant, 太陽地球環境研究所, 助手 (10022617)
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| Co-Investigator(Kenkyū-buntansha) |
MORISHITA Isao Department of Information Management, Asahi University, Professor, 経営学部, 教授 (40148200)
JUJII Zenjiro Solar-Terrestrial Environment Laboratory, Nagoya University, Assistant, 太陽地球環境研究所, 助手 (10022724)
YASUNO Shizuko Solar-Terrestrial Environment Laboratory, Nagoya University, Assistant Professor, 太陽地球環境研究所, 助教授 (30022586)
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| Project Period (FY) |
1997 – 1998
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| Keywords | Cosmic ray / Solar Magnetic Cloud / Forbush decrease / Precusory event |
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| Research Abstract |
The existence of the precursory decrease of cosmic rays in front of the shock wave of the interplanetary magnetic field (IMF) was pointed out by Fujimoto et al. and the phenomenon has been interpreted as being due to their IMF-collimated outward flow across the shock from the inside of the Forbush decrease.
To observe such a beam-like precursory decrease effectively, a new narrow angle multidirectional muon telescope have been constructed at Mt. Norikura and fully operated since May 1998. The telescope covers *50ﾟ of the sky with the angular resolution of about 7ﾟ Forbush decrease events were observed on 26 August and 25 September in 1998. The counting rates of the event are plotted in the two-dimensional map of 21*21 bin. The time sequence of the plot seems to indicate that the F.D.event is not uniform in space and is non-stable in time. We submit the report of the above results to 26th Int. Cosmic ray Conference, Salt Lake City, in August 1999.
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Research Products
(10 results)
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[Publications] K.Fujimoto, Z.Fujii, K.Munakata, S.Yasue, I.Mor-ishita, J.E.Humble, A.G.Fenton, K.B.Fenton and M.L.Duldig: "Mean free path of cosmic rays in the disturbance region behind IMF-shock, causing Forbush decrease at Septem-ber, 9,1992." Proc.25th Int.Cosmic Ray Con-f., Durban. 1. 433-436 (1997)
Description
「研究成果報告書概要(欧文)」より
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[Publications] I.Morishita, K.Fujimoto, Z.Fujii, S.Sakakibara, K.Nagashima, K.Munakata, S.Yasue, J.E.Humble, K.B.Fenton, A.G.Fenton and M.L.Duldig: "Characteristics of precursory decrease of Forbush de-crease inferred from world wide observations of muon and neutron intensities." Proc.25th Int.Cosmic Ray Con-f., Durban. 1. 405-408 (1997)
Description
「研究成果報告書概要(欧文)」より
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