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Quasi-Periodicity in global solar radio flux at metric wavelengths during noise storms

Sundaram, Shanmugha GA and Subramanian, KR (2004) Quasi-Periodicity in global solar radio flux at metric wavelengths during noise storms. In: Solar Physics, 222 (2). pp. 311-322.

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Abstract

We present observational results from studying the quasi-periodicities in global solar radio flux during periods of enhanced noise storm activity,over durations of ~ 4 hrs a day ( "intra-day"variations ), observed at 77.5 MHz with the newly commissioned log-periodic array tracking system at the Gauribidanur radio observatory. Positional information on the storm centers were obtained with the radio imaging data from the Nancay (sic.) Radioheliograph ( NRH ), while their active region ( AR ) counterparts on the photosphere( and the overlying chromosphere ) were located from the H_alpha images of the Big Bear Solar Observatory ( BBSO ). The quasi-periodicity in flux was found to be 110 minutes, with the fluctuation in flux being 3 (+/- 1.5) solar flux units ( sfu ). The results of such pulsations are interpreted qualitatively as evidence for coronal seismology.

Item Type: Journal Article
Additional Information: Copyright for this article belongs to Kluwer Academic Publishers.
Keywords: corona;radio;noise storms;quasi-periodicity;pulsations;seismology
Department/Centre: Division of Physical & Mathematical Sciences > Joint Astronomy Programme
Date Deposited: 02 May 2005
Last Modified: 19 Sep 2010 04:14
URI: http://eprints.iisc.ernet.in/id/eprint/1042

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