Quasi-Periodicity in global solar radio flux at metric wavelengths during Noise Storms

Details Quasi-Periodicity in global solar radio flux at metric wavelengths during Noise Storms Quasi-Periodicity in global solar radio flux at metric wavelengths during Noise Storms

Aug 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004soph..222..311s&link_type=abstract

Solar Physics, v. 222, Issue 2, p. 311-322 (2004).

Physics

2

Scientific paper

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 hr 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 was obtained with the radio imaging data from the Nan\c cay Radio Heliograph (NRH), while their active region counterparts on the photosphere (and the overlying chromosphere ) were located from the Hα images of the Big Bear Solar Observatory. The quasi-periodicity in flux was found to be 110 min, with the fluctuation in flux being 3(+/-1.5) solar flux units (s.f.u.). The results of such pulsations are interpreted qualitatively as evidence for coronal seismology.

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