Impulsive and Extended Acceleration in the 1977 November 6 Solar Flare

Abstract

Yohkoh observed strong gamma-ray emission from a flare (X9.4/2B) on November 6, 1997. The emission was impulsive and lasted for about 4 min (11:52-11:56 UT). The spectrum exhibits gamma-ray lines and extends up to a few tens of MeV. The Oriented Scintillation Spectrometer Experiment (OSSE) on board the Compton Gamma-Ray Observatory (CGRO) missed the peak phase of gamma-ray flare but detected significant solar neutrons between 12:08 and 12:28 UT. In order to explain the OSSE neutron time profile, we propose an extended neutron production. We find a continued gamma-ray production after the peak phase from the Yohkoh result, supporting our proposal. We discuss the possibility that particle acceleration is associated with a magnetic reconnection and its site moves up with time.

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Document Details

Document Type
Technical Report
Publication Date
Jan 01, 2002
Accession Number
ADA596975

Entities

People

  • Gerald H. Share
  • H. Ogawa
  • H. Takeda
  • M. Yoshimori
  • Ronald J. Murphy
  • S. Nakayama

Organizations

  • United States Naval Research Laboratory

Tags

Communities of Interest

  • Energy and Power Technologies

DTIC Thesaurus Topics

  • Cosmic Rays
  • Detection
  • Emission
  • Energy
  • Gamma Rays
  • Hard X Rays
  • High Energy
  • Measurement
  • Nuclear Reactions
  • Observatories
  • Particles
  • Production
  • Solar Flares
  • Solar Physics
  • Space Sciences
  • Spectra
  • X Rays

Fields of Study

  • Physics

Readers

  • Solar Physics