Astronomy and Astrophysics – Astronomy
Scientific paper
May 1975
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975jgr....80.1725l&link_type=abstract
Journal of Geophysical Research, vol. 80, May 1, 1975, p. 1725-1734.
Astronomy and Astrophysics
Astronomy
2
Cosmic Ray Showers, Interplanetary Magnetic Fields, Magnetic Variations, Solar Protons, Astronomical Models, Forbush Decreases, Galactic Radiation, Magnetic Field Configurations, Relativistic Particles, Solar Activity Effects, Solar Flares, Solar Wind
Scientific paper
The cosmic ray storm in August 1972 is analyzed on the basis of solar proton and interplanetary magnetic field data. Three features of this storm are described in detail: a ground level event at 1500 UT on August 4, a precursory increase of galactic cosmic rays recorded by neutron monitors at 2100 UT, and a sharp Forbush decrease at 2100-2200 UT followed by a rapid recovery and overshoot. Models are presented and discussed to describe these features. It is concluded that the ground level event was caused by relativistic solar particles experiencing coronal spreading onto flux tubes coming out toward earth; the precursory increase was due to a nearly radial cosmic ray current with a fractional magnitude of about 0.05 in the interplanetary region; and the Forbush decrease was the result of a magnetic tangential discontinuity behind the shock which arrived at earth at 2100 UT.
Hsieh L.
Lockwood John A.
Quenby John J.
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