Highly significant detection of solar neutrons on 2005 September 7 |
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| Institution: | 1. Space Sciences Laboratory, University of California, Berkeley, 7 Gauss Way 7450, Berkeley, CA 94720, USA;2. Solar-Terrestrial Environment Laboratory, Nagoya University, Furo-cho, Chikusa-ku, Nagoya 464-8601, Japan;3. College of Industrial Technologies, Nihon University, 2-11-1, Shinei, Narashino, Chiba 275-0005, Japan;4. College of Engineering, Chubu University, Kasugai, Aichi 487-8501, Japan;5. Instituto de Geofísica, Universidad National Autónoma de México, Ciudad Universitaria, Coyoacán D.F. 04510, México;6. Instituto Investigaciones Fisicas, Universidad Mayor de San Andrés, La Paz, Bolivia;7. Department of Physics, Tokyo Institute of Technology, Meguro-ku, Tokyo 152-8551, Japan;8. Graduate School of Science, Osaka City University, Osaka 558-8585, Japan;9. Department of Earth and Planetary Science, University of Tokyo, Tokyo 113-0033, Japan;10. ISAS/JAXA, Sagamihara 229-8510, Japan;11. DSM/DAPNIA/SAp, CEA Saclay, 91191 Gif-sur-Yvette, France |
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| Abstract: | We have successfully detected solar neutrons at ground level in association with the X17.0 solar flare that occurred on 2005 September 7. Observations were made with the solar neutron telescopes and neutron monitors located in Bolivia and Mexico. In this flare, large fluxes of hard X-rays and γ-rays were observed by the GEOTAIL and the INTEGRAL satellites. The INTEGRAL observations include the 4.4 MeV line γ-rays of 12C. The data suggest that solar neutrons were produced at the same time as these hard electromagnetic radiations. We have however found an apparent discrepancy between the observed and the expected time profiles. This fact suggests a possible extended neutron emission. |
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