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Unusual Absorption of a Solar Type II Burst by ‘Shadow’ Type III Bursts

Published online by Cambridge University Press:  25 April 2016

K. Kai
K. Kai*
Affiliation:
Division of Radiophysics, CSIRO, Sydney
*
* On leave from Tokyo Astronomical Observatory, University of Tokyo.
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Extract

A Hα flare (12°N., 49°W.) on 1968 August 23d23h45m was followed by a short-lived type II burst whose dynamic spectrum, as recorded with the Culgoora radio-spectrograph, is shown in Figure 1. The type II burst had split-band structure; the upper band drifted from 130 MHz to 80 MHz, the lower band from 100 MHz to below 80 MHz (at the time the 25-74 MHz band of the spectrograph was less sensitive than the 74-220 MHz). Unusual spectral features can be seen in each split band. The most remarkable one is an absorption feature between 23h52m02s and 23h52m 10s – the depression in the bright type II emission along an ‘inverted U’ (between 120 and 85 MHz). Several other similar, though less marked, absorption features can be found between 23h51m45s and 23h52m30s.

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Contributions
Information
Publications of the Astronomical Society of Australia , Volume 2 , Issue 4 , October 1973 , pp. 219 - 222
Copyright
Copyright © Astronomical Society of Australia 1973

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References

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