HR: 1330h
AN: SH23B-07    [Abstracts]
TI: Comparisons between Ground-Based Photometry and Space-Based Measurements of the Total Solar Irradiance
AU: * Chapman, G
EM: gchapman@csun.edu
AF: San Fernando Observatory/CSUN, 14031 San Fernando Road, Sylmar, CA 91342
AU: Cookson, A
EM: angela.cookson@csun.edu
AF: San Fernando Observatory/CSUN, 14031 San Fernando Road, Sylmar, CA 91342
AU: Dobias, J
EM: jan.dobias@csun.edu
AF: San Fernando Observatory/CSUN, 14031 San Fernando Road, Sylmar, CA 91342
AU: Walton, S
EM: stephen.walton@csun.edu
AF: San Fernando Observatory/CSUN, 14031 San Fernando Road, Sylmar, CA 91342
AB: We will review the usefulness of ground-based full-disk photometry in conjunction with space-based measurements of the Total Solar Irradiance (TSI). It is known that sunspots and faculae cause changes in the TSI. These features need to be modeled using ground-based photometry and their effects removed in order to search for possible other causes of TSI variation. Work to date has shown that approximately 94% of the variance in TSI can be explained by sunspots and faculae/network. Since ground-based photometry is carried out daily, it can help identify anomalies in space-based TSI measurements. Finally, ground-based photometry can help in tying together TSI measurements from different spacecraft that have different native irradiance scales. This work has been partially supported by grants from NASA and NSF.
DE: 7538 Solar irradiance
SC: SPA-Solar and Heliospheric Physics [SH]
MN: 2005 Joint Assembly