3-11 July 2007
Merida, Mexico
Mexico/General timezone
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Contribution Oral

Merida, Mexico - Yucatan I (Fiesta Americana)

Ion acceleration and neutral emission mechanisms for 2005 September 7 flare

Speakers

  • Dr. Kyoko WATANABE

Primary authors

  • Dr. Kyoko WATANABE (Space Sciences Laboratory, University of California, Berkeley, 7 Gauss Way, Berkeley, CA 94720, U.S.A.)

Co-authors

  • Prof. Robert LIN (Space Sciences Laboratory, University of California, Berkeley, 7 Gauss Way, Berkeley, CA 94720, U.S.A.)
  • Dr. Shoichi SHIBATA (College of Engineering, Chubu University, Kasugai 487-8501, Japan)
  • Prof. Takasuke SAKAI (College of Industrial Technologies, Nihon University, Narashino 275-0005, Japan)
  • Prof. Jose VALDES-GALICIA (Instituto de Geofisica, Universidad Nacional Autonoma de Mexico, 04510, D. F. Mexico, Mexico)
  • Mr. Luis GONZALEZ (Instituto de Geofisica, Universidad Nacional Autonoma de Mexico, 04510, D. F. Mexico, Mexico)
  • Mr. Alejandro HURTADO (Instituto de Geofisica, Universidad Nacional Autonoma de Mexico, 04510, D. F. Mexico, Mexico)
  • Mr. Octavio MUSALEM (Instituto de Geofisica, Universidad Nacional Autonoma de Mexico, 04510, D. F. Mexico, Mexico)
  • Prof. Alfonso VELARDE (Instituto de Investigaciones Fisicas, Universidad Mayor de San Andres, La Paz, Bolivia)
  • Prof. Rolando TICONA (Instituto de Investigaciones Fisicas, Universidad Mayor de San Andres, La Paz, Bolivia)
  • Prof. Nicolas MARTINIC (Instituto de Investigaciones Fisicas, Universidad Mayor de San Andres, La Paz, Bolivia)
  • Prof. Pedro MIRANDA (Instituto de Investigaciones Fisicas, Universidad Mayor de San Andres, La Paz, Bolivia)
  • Dr. Gordon HURFORD (Space Sciences Laboratory, University of California, Berkeley, 7 Gauss Way, Berkeley, CA 94720, U.S.A.)
  • Prof. Fumio KAKIMOTO (Department of Physics, Tokyo Institute of Technology, Meguro-ku, Tokyo 152-8551, Japan)
  • Dr. Yoshiki TSUNESADA (Department of Physics, Tokyo Institute of Technology, Meguro-ku, Tokyo 152-8551, Japan)
  • Dr. Hisao TOKUNO (Institute for Cosmic Ray Research, University of Tokyo, Kashiwa, Chiba, 277-8582, Japan)
  • Dr. Shoichi OGIO (Graduate School of Science, Osaka City University, Osaka 558-8585, Japan)
  • Dr. Ronald MURPHY (Naval Research Laboratory, 4555 Overlook Avenue, SW, Code 7600A, Washington DC 20375, U.S.A.)
  • Dr. Gerald SHARE (Department of Astronomy, University of Maryland, College Park, MD 20742, U.S.A.)
  • Dr. Michael HARRIS (Max Planck Institut fur extraterrestrische Physik, D-85741 Garching, Germany)
  • Dr. Maurice GROS (DSM/DAPNIA/SAp, CEA Saclay, 91191 Gif-sur-Yvette, France)
  • Dr. Takashi SAKO (Solar-Terrestrial Environment Laboratory, Nagoya University, Nagoya, Aichi 464-8601, Japan)
  • Prof. Yasushi MURAKI (Solar-Terrestrial Environment Laboratory, Nagoya University, Nagoya, Aichi 464-8601, Japan)
  • Dr. Yutaka MATSUBARA (Solar-Terrestrial Environment Laboratory, Nagoya University, Nagoya, Aichi 464-8601, Japan)

Abstract content

In association with an X17.0 flare on 2005 September 7, strong neutral emissions were detected both in space and on the ground. In space, intense emissions of gamma-rays were registered by INTEGRAL and by RHESSI during the decay phase. Gamma-ray lines at 0.511, 2.2, 4.4, and 6.1 MeV were observed and there was evidence for pion-decay radiation. On the ground, relativistic neutrons were observed by the neutron monitors at Mt. Chacaltaya and Mexico City and by the solar neutron telescopes at Chacaltaya and Mt. Sierra Negra. The neutron signal continued for more than 20 minutes with high statistical significance. The long decay of the signals suggests that ions were continuously accelerated or trapped in the emission site. We also find that gamma-rays were emitted over a corresponding extended period. Only when we in cooperate the high-energy gamma-ray emission time history can we explain the long-lasting neutron emission. We also use the Hua et al. (2002) solar-flare magnetic loop transport and interaction model to find the best model to explain the data.

Reference

Proceedings of the 30th International Cosmic Ray Conference; Rogelio Caballero, Juan Carlos D'Olivo, Gustavo Medina-Tanco, Lukas Nellen, Federico A. Sánchez, José F. Valdés-Galicia (eds.); Universidad Nacional Autónoma de México, Mexico City, Mexico, 2008; Vol. 1 (SH), pages 45-48