Contribution of Chromospheric Features to UV Irradiance Variability

Details Contribution of Chromospheric Features to UV Irradiance Variability Contribution of Chromospheric Features to UV Irradiance Variability

Aug 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006iaujd...8e...1k&link_type=abstract

Solar and Stellar Activity Cycles, 26th meeting of the IAU, Joint Discussion 8, 17-18 August 2006, Prague, Czech Republic, JD08,

Physics

Scientific paper

We have determined the time series data of the different parameters like the intensity, area, the full-disk intensity (spatial K index), and the Full Width at Half Maximum (FWHM) for the segregated features of the chromosphere from the CaII K spectroheliograms of 1992 and 1980, observed at the NSO at Sac Peak, using their histograms taken for the full-disk. We established, for the first time, from the results of 1992 and 1980 images that the FWHM can be used as a good index for measuring and describing the chromospheric activity in the K-line. Our study shows that besides the plages, a significant portion of the variation observed in UV irradiance is related to the changing emission of the network and intranetwork + background regions. This indicates that in addition to plages and network, the intranetwork + background regions may also play a significant role in their contribution to the variation in UV irradiance. We estimated the contribution of various chromospheric features to the total CaII K flux from the intensity time series data and found that about 50% of the CaII K solar cycle variability results from plages, about 32% from network, and about 18% from intranetwork + background features.

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