Dependence of radio emission in large H alpha flares 1967-1970 upon the orientation of the local solar magnetic field

Details Dependence of radio emission in large H alpha flares 1967-1970 upon the orientation of the local solar magnetic field Dependence of radio emission in large H alpha flares 1967-1970 upon the orientation of the local solar magnetic field

Jun 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983soph...85..339r&link_type=abstract

Solar Physics (ISSN 0038-0938), vol. 85, June 1983, p. 339-349.

Physics

2

H Alpha Line, Magnetic Field Configurations, Radio Emission, Solar Flares, Solar Magnetic Field, Ionizing Radiation, Solar Corona, Solar Spectra, Solar X-Rays

Scientific paper

Published data on ionizing radiation (as reflected in sudden ionospheric disturbances), H-alpha importance, 10-cm flux, dynamic spectrum, and 200-MHz flux are analyzed for a group of 84 solar flares (from 1967 to 1970) classified by Pudovkin and Chertkov (1976). The group consists of 29 flares with southern orientation of the 100,000-km-scale overlying magnetic field, 32 with northern orientation, and 23 with indeterminate orientation; all have H-alpha importance greater than about 2. Slightly greater X-ray and optical emissions, but one-order-of-magnitude greater prompt 200-MHz and 10-cm fluxes are found in southern as compared to northern-oriented flares. It is inferred that the amount of electromagnetic flare energy radiated promptly from the corona, as compared with that radiated from the chromosphere, was significantly affectly by the orientation of the overlying large-scale magnetic field during the period of observation. This trend is shown to be consistent despite some periodic variation.

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