Coronal magnetic field structure derived from two-frequency radioheliograph observations

✍ Scribed by K. Kai; K. V. Sheridan

• Publisher: Springer
• Year: 1974
• Tongue: English
• Weight: 577 KB
• Volume: 35
• Category: Article
• ISSN: 0038-0938
• DOI: 10.1007/bf00156966

✦ Synopsis

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.