2005 Fiscal Year Final Research Report Summary
Observation of solar neutrons at high altitudes near the equator
| Project/Area Number |
16540242
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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 |
Particle/Nuclear/Cosmic ray/Astro physics
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| Research Institution | Nagoya University |
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Principal Investigator |
MATSUBARA Yutaka Nagoya University, Solar-Terrestial Environment Laboratory, Associate Professor, 太陽地球環境研究所, 助教授 (80202323)
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| Project Period (FY) |
2004 – 2005
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| Keywords | network of solar neutron detector / high altitude near the equator / particle acceleration / Chacaltaya / Sierra Negra / automatic data taking / solar flare / 2005 September 7 |
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| Research Abstract |
This research aims to clarify the acceleration mechanism of high energy particles at the solar surface, by observing on the ground high energy solar neutrons (>100MeV) produced by the interaction between accelerated protons and the solar atmosphere. It is more preferable to use neutrons than protons to study solar acceleration, because neutrons are not reflected by the interplanetary magnetic field. In order to detect solar neutrons effectively, the group which mainly includes Solar-Terrestrial Environment Laboratory, Nagoya University, has completed a network of solar neutron detectors in the world to observe the Sun for a whole day. These detectors are located at high mountains near the equator, because solar neutrons are attenuated while propagating in the air. According to the Grant-in-Aid for Scientific Research, the data taking system of the solar neutron detector at Chacaltaya in Bolivia, which was designed more than 15 years ago, has been replaced by a quite a new system, by wh
… More
ich a data taking starts automatically after a power cut of the electricity. Chacaltaya (altitude : 5250m, latitude : 16 degrees S) is the best place to observe solar neutrons in our network. This experience was useful to adopt the same system to the detector at Sierra Negra in Mexico, where nobody stays permanently. Sierra Negra (altitude : 4600m, latitude : 19 degrees N) the second best place to observe solar neutrons. These new systems are believed to work properly during the next solar cycle, which will start in 2007, and, we bacame to detect solar neutrons much more efficiently than before. While we were improving both systems, a large solar flare occurred on September 7, 2005. The solar neutron detectors both at Chacaltaya and Sierra Negra have succeeded in detecting solar neutron signals, which are the most significant ones so far obtained by our detectors. Moreover, neutron monitors at Chacaltaya and Mexico City also detected clear signals. The analysis on this events is now in progress, but obtaing this kind of event is what we have aimed by this Grant-in-Aid for Scientific Research. Less
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[Journal Article] Solar neutron events of October-November 20032006
Author(s)
K.Watanabe, M.Gros, P.H.Stoker, K.Kudela, C.Lopate, J.F.Valdes-Galicia, A.Hurtado, O.Musalem, R.Ogasawara, Y.Mizumoto, M.Nakagiri, A.Miyashita, Y.Matsubara, T.Sako, Y.Muraki, T.Sakai, S.Shibata
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Journal Title
Astrophys.J. 636
Pages: 1135-1144
Description
「研究成果報告書概要(欧文)」より
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[Journal Article] Solar neutron events that have been found in solar cycle 232005
Author(s)
E.O.Flueckiger, R.Buetikofer, A.Chilingarian, G.Hovsepyan, Y.H.Tan, T.Yuda, H.Tsuchiya, M.Ohnishi, Y.Katayose, Y.Muraki, Y.Matsubara, T.Sako, K.Watanabe, S.Masuda, T.Sakai, S.Shibata, R.Ogasawara, Y Mizumoto, M.Nakagiri, A.Miyashita, P.H.Stoker, C.Lopate, K.Kudela, M.Gros
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Journal Title
Int.J.Mod.Phys.A 20
Pages: 6646-6649
Description
「研究成果報告書概要(欧文)」より
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[Journal Article] Search for solar neutrons associated with proton flares in solar cycle 232005
Author(s)
Y.Matsubara, Y Muraki, T.Sako, K.Watanabe, S.Masuda, T.Sakai, S.Shibata, E.Flueckiger, R.Buetikofer, A.Chilingarian, G.Hovsepyan, Y.H.Tan, T.Yuda, M.Ohnishi, H.Tsuchiya, Y.Katayose, R.Ogasawara, Y.Mizumoto, M.Nakagiri, A.Miyashita, A.Velarde, R.Ticona, N.Martinic
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Journal Title
Proc.29th Int.Cosmic Ray Conf. Vol.1
Pages: 17-20
Description
「研究成果報告書概要(欧文)」より
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[Journal Article] Solar neutron events associated with large solar flares in solar cycle 232005
Author(s)
K.Watanabe, Y.Muraki, Y.Matsubara, T.Sako, T.Sakai, H.Tsuchiya, S.Shibata, S.Masuda, M.Yoshimori, N.Ohmori, A.Velarde, R.Ticona, N.Martinic, P.Miranda, F.Kakimoto, S.Ogio, Y.Tsunesada, H.Tokuno, Y.Shirasaki, J.F.Valdes-Galicia, A.Hurtado, O.Musalem, L.X.Gonzalez, R.Ogasawara, Y.Mizumoto, M.Nakagiri, A.Miyashita, P.H.Stoker, C.Lopate, K.Kudela, M.Gros
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Journal Title
Proc.29th Int.Cosmic Ray Conf. Vol.1
Pages: 37-40
Description
「研究成果報告書概要(欧文)」より
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[Journal Article] An improved solar neutron telescope installed at a very high altitude in Mexico2004
Author(s)
J.F.Valdes-Galicia, Y.Muraki, H.Tsujihara, T.Sako, O.Musalem, A.Hurtabo, L.X.Gonzalez, Y.Matsubara, K.Watanabe, N.Hirano, N.Tateiwa, S.Shibata, T.Sakai
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Journal Title
Nucl.Instr.and Meth. A535
Pages: 656-664
Description
「研究成果報告書概要(欧文)」より
