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Development of directional flux anisotropy during the solar event on June 16, 1998

  • Authors: Torsti, Jarmo
  • Publication: Proceedings of the 26th International Cosmic Ray Conference. August 17-25, 1999. Salt Lake City, Utah, USA. Under the auspices of the International Union of Pure and Applied Physics (IUPAP). Volume 6. Edited by D. Kieda, M. Salamon, and B. Dingus, p.336, 1999
  • Solar event of 1998 June 16-21
  • Case study
  • ADS link
  • Abstract: In the analysis of the proton event observed by energetic particle telescope ERNE onboard the SOHO spacecraft during 16-21 June, 1998, we found two phases of strong anisotropy in the directional intensities of protons in energy range 16-40 MeV. The first one was during the beginning of the event, and the other about 39 hours from the event onset. The anisotropy at the latter time was stronger than anytime during the major 10-hour plateau type intensity phase. The ratio of intensities in two pitch angle ranges I(0-25°)/ I(60-90°) was ≈1.4, during 10-15 UT. The anisotropy was followed by average intensity enhancement which was roughly about 100 % higher than the intensity decay level of the major peak.


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