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Quasi-Periodicity in global solar radio flux at metric wavelengths during Noise Storms View all abstracts by submitter

G. A. Shanmugha Sundaram   Submitted: 2004-11-25 01:14

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 Nançay (sic.) Radioheliograph (NRH), while their active region (AR) counterparts on the photosphere (and the overlying chromosphere) were located from the Hα 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.

Authors: G. A. Shanmugha Sundaram, K. R. Subramanian
Projects: None

Publication Status: Published in 2004, Solar Physics, 222(2), 311
Last Modified: 2004-11-25 01:14
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