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Observations of Solar Active Regions at 2 and 6 cm Wavelengths with 3 Arc Second Resolution

Published online by Cambridge University Press:  14 August 2015

T. Velusamy
Affiliation:
Astronomy Program, University of Maryland, College Park, MD
M. R. Kundu
Affiliation:
Astronomy Program, University of Maryland, College Park, MD

Extract

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We have used the Very Large Array of the NRAO to observe solar active regions at 2 and 6 cm wavelengths in May 1979. In this paper we present and discuss the fine structure components of a sunspot associated radio region observed with a resolution of 3″ arc on May 4 and 5, 1979. In this region (McMath 15974) there were two distinct groups of sunspots separated by about 3′ arc. Group I located towards the west limb contained two spots while Group II in the east was a complex containing several spots that emerged during the period of our observations. At 6 cm both the sunspot groups were within the primary beam whereas at 2 cm only Group I was within the field of view. The VLA observations were made at 6 and 2 cm alternating between them every 5 minuts. The region was mapped with a resolution of about 3″ x 3″ using 10 hours of synthesis data on each day.

Type
Session II - Active Regions
Copyright
Copyright © Reidel 1980