Abstract
An exceptional variety of positions and polarizations was found for two type I storms and numerous sporadic bursts observed during 15 consecutive days with the Culgoora radioheliograph at 80 and 160 MHz. The radio data are combined with optical data to derive a model of the coronal magnetic field structure for a complex of active regions; in this model the type I sources are located on multiple strong-field loops, and the sources of the sporadic bursts on widely diverging weak-field arches. It is also shown that this model can explain the seemingly erratic placement of the storm sources and the appearance of the sporadic sources round a large arc. The observed positions and polarizations support, rather convincingly, the hypothesis that type I and type III radiations are of the ordinary magnetoionic mode.
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On leave from Tokyo Astronomical Observatory, University of Tokyo.
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Kai, K., Sheridan, K.V. Coronal magnetic field structure derived from two-frequency radioheliograph observations. Sol Phys 35, 181–192 (1974). https://doi.org/10.1007/BF00156966
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DOI: https://doi.org/10.1007/BF00156966