A STUDY OF THE RELATIONSHIP BETWEEN ABSORPTION-TIME PROFILES OF POLAR-CAP- ABSORPTION EVENTS AND FORBUSH DECREASES OF COSMIC-RAY INTENSITY
Forbush decrease data recorded by neutron monitors during PCA events support the interpretation of the absorption-time profiles of PCA events as due to solar particles under the influence of magnetic fields carried by solar plasma. All PCA events showing evidence of strong trapping of solar particles are accompanied by strong Forbush decreases, the magnitudes of which are a function of the delay time from flare to SC storm. Those PCA events showing little evidence of trapping are accompanied by only very weak decreases. The large western excess of these latter events is explained in terms of sun-earth magnetic linkage set up by earlier flare activity. The relative merits of two models of the interplanetary fields are examined. (auth)
- Research Organization:
- Univ. of California, Berkeley
- Sponsoring Organization:
- USDOE
- NSA Number:
- NSA-18-018598
- OSTI ID:
- 4028440
- Journal Information:
- Journal of Geophysical Research (U.S.), Journal Name: Journal of Geophysical Research (U.S.) Vol. Vol: 69; ISSN JGREA
- Country of Publication:
- Country unknown/Code not available
- Language:
- English
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THE RECOVERY CHARACTERISTICS OF FORBUSH DECREASES AND THE CONFIGURATION OF THE ASSOCIATED SOLAR EMISSION
Asymmetries in the Forbush decreases of the cosmic radiation: 1. Differences in onset times