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The Position of a Type I Storm Source in the Magnetic Field of an Active Region

Published online by Cambridge University Press:  25 April 2016

G. A. Dulk  and
G. J. Nelson
G. A. Dulk
Affiliation:
Division of Radiophysics, CSIRO, Sydney
G. J. Nelson
Affiliation:
Division of Radiophysics, CSIRO, Sydney
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Extract

Type I storms generally occur in association with large sun-spots and the radiation is usually circularly polarized. Statistically it has been found that the sense of polarization, right-hand (RH) or left-hand (LH), usually corresponds to the ordinary magneto-ionic mode in the field of the dominant spot of the active region; when a following spot dominates, the polarization tends to be determined by this spot rather than by the leading field. One-dimensional position measurements show that the type I sources are usually not radially above the active region but are displaced by a few minutes of arc. The source sizes are about l′.2 to 4′.5 at 169 MHz and the sources frequently contain double, multiple or bipolar structure at 80 and 160 MHz.

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Publications of the Astronomical Society of Australia , Volume 2 , Issue 4 , October 1973 , pp. 211 - 214
Copyright
Copyright © Astronomical Society of Australia 1973

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