Physics
Scientific paper
Mar 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989soph..120..153s&link_type=abstract
Solar Physics (ISSN 0038-0938), vol. 120, no. 1, 1989, p. 153-172.
Physics
16
Cosmic Rays, Forbush Decreases, Shock Waves, Solar Flares, Interplanetary Magnetic Fields, Shock Fronts
Scientific paper
A ten-year survey of the effects of solar flare-generated shock-waves on the ambient cosmic rays (E equal to or greater than 35 MeV) as well as on the solar particle population at low energies (E equal to or greater than 300 keV) shows that the quasi-perpendicular side of the expanding shock front (solar flare site to the east of the sun-spacecraft line) gives rise to prominent Forbush decreases and large ESP events, whereas the presumably turbulent quasi-parallel part of the large-scale shock front-IMF configurations (source site to the west of the sun-spacecraft line) is associated, on the average, with small (4 percent or less) or no Forbush decreases and weak or no ESP events. The role of grad-B drifts of the particles at quasi-perpendicular shocks is suggested as a common cause for both the ESP events and the Forbush decreases. The observations indicate that turbulence is not a dominant factor in the above shock effects on the energetic particle populations both at low and high energies.
Dodopoulos C. A.
Sarris Emmanuel T.
Venkatesan D.
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