Other
Scientific paper
Jul 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990baicz..41..243v&link_type=abstract
Astronomical Institutes of Czechoslovakia, Bulletin (ISSN 0004-6248), vol. 41, no. 4, July 1990, p. 243-251.
Other
Irradiance, Noise Storms, Solar Atmosphere, Solar Flares, Annual Variations, Solar Magnetic Field, Sunspots
Scientific paper
The association of solar irradiance decreases with flare and noise storm activity is analyzed. The studied irradiance dips were accompanied by enhanced flare activity, but increased flare activity did not necessarily imply the occurrence of a dip. On the other hand, longlasting broadband noise storm activity was always accompanied by an irradiance dip. An upper limit to the amplitude of the irradiance perturbation caused by a sunspot group of a given area and flare activity is estimated. Also, a lower limit to the irradiance perturbation amplitude with respect to noise storm activity is established. The estimated energies associated with the considered processes were found to be much smaller than the energies related to the irradiance decreases. Nevertheless, the analysis indicates the importance of nonthermal processes in large agglomerations of magnetic fields related to irradiance decreases.
Ruzdjak Vladimir
Vrsnak Bojan
Zlobec Paolo
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