Center-to-Limb Variation of the Irradiance Contributions of Bright Active Regions.

Details Center-to-Limb Variation of the Irradiance Contributions of Bright Active Regions. Center-to-Limb Variation of the Irradiance Contributions of Bright Active Regions.

Dec 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007agufmsh53a1075p&link_type=abstract

American Geophysical Union, Fall Meeting 2007, abstract #SH53A-1075

Physics

7599 General Or Miscellaneous

Scientific paper

We investigate the variable contribution to TSI of a typical bright active region as it evolves and transits the solar disk. Bright active regions are manifest as bright faculae on images of the solar photosphere, but are in fact 3- dimensional structures, stretching up to coronal heights. Using spacecraft observations of TSI, and ground- based red and Ca-K line images from the San Fernando Observatory, we compute the center-to-limb variation of the irradiance contributions of bright active regions. We evaluate the red continuum irradiance component that originates in the photosphere and the spectral line irradiance component that originates in the lower chromosphere. We also attempt to infer the bolometric contrast of a bright active region. This work is supported in part by NSF grant ATM-0533511.

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