HR: 1340h
AN: SH53A-1075    [Abstracts]
TI: Center-to-Limb Variation of the Irradiance Contributions of Bright Active Regions.
AU: * Preminger, D G
EM: dora.preminger@csun.edu
AF: San Fernando Observatory, California State University Northridge, 18111 Nordhoff St, Northridge, CA 91330-8268, United States
AU: Chapman, G A
EM: gchapman@csun.edu
AF: San Fernando Observatory, California State University Northridge, 18111 Nordhoff St, Northridge, CA 91330-8268, United States
AB: 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.
DE: 7599 General or miscellaneous
SC: SPA-Solar and Heliospheric Physics [SH]
MN: 2007 Fall Meeting