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A moving Type IV radio burst and its relation to the coronal magnetic field

โœ Scribed by George A. Dulk; Martin D. Altschuler

Publisher
Springer
Year
1971
Tongue
English
Weight
645 KB
Volume
20
Category
Article
ISSN
0038-0938

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โœฆ Synopsis

A moving Type IV burst, observed with the Culgoora radioheliograph on 1970 April 29, moved out to about 3 R o and attained high circular polarization before fading. The appearance of the moving Type IV source suggests an isolated, self-contained, synchrotron emitting plasmoid. Magnetic field maps of the corona derived from photospheric observations indicate that the plasmoid moved almost radially outward from the flare region along open field lines. To explain the observed source structure and high unipolar polarization, we suggest that a ring of electric current was ejected from the low corona and guided by coronal magnetic field lines; the radio emission was synchrotron radiation generated by mildly-relativistic electrons trapped in the poloidal magnetic field of the ring current.

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