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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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.|
|Department/Centre:||Division of Physical & Mathematical Sciences > Joint Astronomy Programme|
|Date Deposited:||02 May 2005|
|Last Modified:||19 Sep 2010 04:14|
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