HR: 14:55h
AN: SH33C-05    [Abstracts]
TI: The Absolute Accuracy of Space-Borne TSI Instruments: A Summary From the July 2005 TSI Accuracy Workshop
AU: * Kopp, G
EM: Greg.Kopp@LASP.Colorado.edu
AF: CU/LASP, 1234 Innovation Drive, Boulder, CO 80303 United States
AU: Butler, J J
EM: James.J.Butler@nasa.gov
AF: NASA/GSFC, MS 614.4, Greenbelt, MD 20771 United States
AU: Lawrence, G
EM: George.Lawrence@LASP.Colorado.edu
AF: CU/LASP, 1234 Innovation Drive, Boulder, CO 80303 United States
AB: Space-borne measurements of the total solar irradiance (TSI) have been continuous since 1978 due to the temporal overlap from multiple instruments. Offsets between the several instruments contributing to the data record exceed the stated uncertainties of many of the instruments. To review the stated and assess the actual accuracies of the instruments, a workshop was held at NIST, Gaithersburg in July 2005 with speakers representing 7 of the space-borne TSI instruments. This workshop focused on two key areas of TSI measurement:
1) What is the absolute accuracy of each instrument?
2) How stable is each instrument, and thus how well can each track long-term changes in the TSI? We summarize the results of the workshop addressing the first of these questions, the absolute accuracy of the instruments. This is the 'Day 1' problem: after ground calibrations and launch, and prior to degradation from solar exposure and the space environment, how well does each instrument measure the true value of the TSI on an absolute scale?
DE: 1650 Solar variability (7537)
DE: 7537 Solar and stellar variability (1650)
DE: 7538 Solar irradiance
DE: 7594 Instruments and techniques
SC: SPA-Solar and Heliospheric Physics [SH]
MN: Fall Meeting 2005