A Search for Periodic Variations of Solar Radio Emission at 3{middle dot}7- and 11{middle dot}1-cm Wavelengths
Open Access
- 1 October 1975
- journal article
- Published by Oxford University Press (OUP) in Monthly Notices of the Royal Astronomical Society
- Vol. 173 (1) , 65-76
- https://doi.org/10.1093/mnras/173.1.65
Abstract
We have looked for periodic time variations in the emission of quiet solar regions with the NRAO† three-element interferometer at 3·7 and 11·1 cm. The visibility function of a source as obtained with a tracking interferometer is an implicit function of time, because of projected baseline changes, and we have therefore only used observations taken when the baseline changes vary slowly with time. The visibility function shows significant time variations, but a power-spectrum analysis of the data revealed no unique periodicity. The estimated size of the time-varying elements is 2ʺ·5 ± 0ʺ·2 arc at 3·7 cm and 7ʺ·3 ± 0ʺ·4 arc at 11·1 cm.Keywords
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