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Geoeffective coronal mass ejections and energetic particles

  • Authors: Valtonen, E.
  • Publication: AGU Geophysical Monograph, Vol. 165, p. 335, 2006
  • Theoretical study
  • ADS link
  • Abstract: Coronal mass ejections (CMEs) can be geoeffective and they are believed to cause major non-recurrent geomagnetic storms. Energetic particles are closely related to the shocks driven by coronal mass ejections in the interplanetary medium. In this paper, the geoeffectiveness of CMEs is reviewed and the means how energetic particle observations can be used to identify interplanetary CMEs approaching the Earth are discussed. A summary is given of the observed geoeffectiveness of halo CMEs and, in particular, of those ejecta, which are identified as magnetic clouds. The principal mechanism and the prerequisites for a geomagnetic storm to occur are very briefly outlined. Relations between CMEs and energetic particles are discussed, and the possibilities are examined to use solar energetic particles and energetic storm particles in the investigation of the properties of interplanetary CMEs and shocks. As a feasibility demonstration, two examples are given of methods using energetic particle observations for geomagnetic storm forecasting.

Created by mevali. Last Modification: Tuesday 22 of May, 2007 13:08:50 UTC by mevali.