Other
Scientific paper
Jun 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991baicz..42..165c&link_type=abstract
Astronomical Institutes of Czechoslovakia, Bulletin (ISSN 0004-6248), vol. 42, no. 3, June 1991, p. 165-170.
Other
2
Solar Activity, Solar Protons, Sunspots, Field Strength, H Alpha Line, Radio Emission, Solar Flares
Scientific paper
Observational characteristics of the solar regions associated with active levels of proton events serve as the basis for studying the events themselves. The review of proton-associated active regions includes data form 1966-1984, and significant features are reported. Proton events tend to begin at sunspots with field strengths of 1500-2500 Gauss which have specific configurations. The proton-associated active regions have H-alpha-flare index values that are usually more than 100 as well as type-III metric bursts. The Ca-II plage index, radio-emission flux, and maximum intensity of the 9.1-cm radio measurement tend to increase as the proton event approaches. H-alpha flares of two types are also related to a majority of the proton events. It is suggested that the factors associated with the proton events can be studied to supplement other methods of predicting the events.
Chakravorti T. B.
Das Tapas Kumar
Das Gupta M. K.
Sen Asok Kumar
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