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SORCE and Future Satellite Observations of Solar IrradianceWith solar activity just passing the maximum of cycle 23, SORCE is beginning a 5 year mission to measure total solar irradiance (TSI) with unprecedented accuracy using phase-sensitive detection, and to measure spectral solar irradiance (SSI) with unprecedented spectral coverage, from 1 to 2000 nm. The new Total Irradiance Monitor (TIM) has 4 active cavity radiometers, any one of which can be used as a fixed-temperature reference against any other that is exposed to the Sun via a shutter that cycles at a rate designed to minimize noise at the shutter frequency. The new Spectral Irradiance Monitor (SIM) is a dual Fery prism spectrometer that can employ either prism as a monochromatic source on the other prism, thus monitoring its transmission during the mission lifetime. Either prism can measure SSI from 200 to 2000 nm, employing the same phase-sensitive electrical substitution strategy as TIM. SORCE also carries dual SOLSTICE instruments to cover the spectral range 100-320 nm, similar to the instruments onboard UARS, and also an XUV Photometer System (XPS) similar to that on TIMED. SSI has now been added to TSI as a requirement of EOS and NPOESS, because different spectral components drive different components of the climate system - UV into upper atmosphere and stratospheric ozone, IR into tropospheric water vapor and clouds, and Visible into the oceans and biosphere. Succeeding satellite missions being planned for 2006 and 2011 will continue to monitor these critical solar variables.
Document ID
20040012775
Acquisition Source
Goddard Space Flight Center
Document Type
Conference Paper
Authors
Cahalan, Robert F.
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Rottman, G.
(Colorado Univ. Boulder, CO, United States)
Woods, T.
(Colorado Univ. Boulder, CO, United States)
Lawrence, G.
(Colorado Univ. Boulder, CO, United States)
Kopp, G.
(Colorado Univ. Boulder, CO, United States)
Harder, J.
(Colorado Univ. Boulder, CO, United States)
McClintock, W.
(Colorado Univ. Boulder, CO, United States)
Date Acquired
August 21, 2013
Publication Date
January 1, 2003
Subject Category
Solar Physics
Meeting Information
Meeting: IGARSS 2003
Location: Toulouse
Country: France
Start Date: July 21, 2003
End Date: July 25, 2003
Distribution Limits
Public
Copyright
Other

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