Cosmic ray decreases and particle acceleration in 1978-1982 and the associated solar wind structures

Details Cosmic ray decreases and particle acceleration in 1978-1982 and the associated solar wind structures Cosmic ray decreases and particle acceleration in 1978-1982 and the associated solar wind structures

Aug 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993jgr....9813295c&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 98, no. A8, p. 13,295-13,302.

Physics

16

Cosmic Rays, Interplanetary Medium, Particle Acceleration, Shock Waves, Solar Wind, Energetic Particles, Solar Protons, Stellar Mass Ejection, Stellar Models

Scientific paper

Results of a study of the time histories of particles in the energy range 1 MeV to 1 GeV at the times of greater than 3-percent cosmic ray decreases in the years 1978-1982 are presented. The intensity-time profiles of the particles are used to separate the cosmic ray decreases into four classes which are subsequently associated with three types of solar wind structures. Decreases in class 1 (15 events) and class 2 (26 events) are associated with shocks driven by energetic coronal mass ejections. For class 1 events, the ejecta are detected at 1 AU, whereas this is not usually the case for class 2 events. The shock must therefore play a dominant role in producing the cosmic ray depression in class 2 events. It is argued that since energetic particles (from MEV to GeV energies) seen at earth may respond to solar wind structures which are not detected at earth, consideration of particle observations over a wide range of energies is necessary for a full understanding of cosmic ray decreases.

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