Coronal Sources at Meter and Optical Wavelengths during the Declining Phase of the Solar Cycle

Details Coronal Sources at Meter and Optical Wavelengths during the Declining Phase of the Solar Cycle Coronal Sources at Meter and Optical Wavelengths during the Declining Phase of the Solar Cycle

Apr 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996soph..165...83l&link_type=abstract

Solar Physics, Volume 165, Issue 1, pp.83-98

Physics

3

Scientific paper

We present observations of the corona at 169 MHz with the Nançay Radioheliograph during the summer of 1984. We compare synoptic maps of the metric radio emission on the solar disk with synoptic charts of the K-corona as well as of the green and the red lines. Local sources of radio emission are not located near regions of enhanced green or red line emission which, in turn, are in general above chromospheric faculae. Thus the radio emissions located in the surroundings of faculae are apparently related to different loop systems, with lower density. The comparison of the radio data with the K-corona showed one radio source associated with enhanced emission both at 1.3 and at 1.7 R &sun;, apparently a streamer. Other radio sources did not show any clear associations, but were nevertheless located within the coronal plasma sheet, delineated by the large-scale K-corona emission. Moreover the large-scale structure of the corona at 169 MHz was quite similar to the coronal plasma sheet observed at 1.3 R &sun; above the limb. The extent of the radio emission in latitude is very similar to that of the K-corona, while the coronal line emission is more concentrated near the solar equator.

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