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December 2006

NIST Hosts TIM Optical Power Measurements

Since the launch of SORCE in early 2003, the Total Irradiance Monitor (TIM) has been measuring total solar irradiance (TSI) values approximately 0.34% lower than the other currently flying TSI instruments ERBE, VIRGO, and ACRIM3. Recent optical power measurements of the ground-based SORCE/TIM Witness Unit at NIST do not indicate that the TIM is measuring erroneously low by this amount. Such collaborations with NIST throughout the SORCE mission have been extremely valuable to TIM calibrations and uncertainties. (Read more in December 2006 newsletter.)

NIST Laser
The NIST laser and optics provide a stable, highpower illumination source for the TIM.


October 2006

SSI Intercomparison Workshop

On September 19, 2006, the SORCE instrument team convened a workshop to discuss and intercompare the past, present, and to some extent, the future instruments that have been responsible for defining the space-based spectral irradiance of the Sun. The Earth science and climate communities currently have a need for a standard top of the atmosphere reference spectra covering a very broad portion of the solar spectrum. The workshop was partitioned into morning and afternoon sessions concentrating first on the ultraviolet spectrum and then on the visible and infrared portions of the spectrum. The workshop took place in the San Juan Islands, WA and was the kick off of the SORCE 2006 Science Meeting.

Learn more about both the workshop and the meeting:


June 2006

SSI & Climate Modeling Workshop (Aug. 2006)

On Wednesday, August 9, 2006, the LASP SORCE science team is hosting a one-day workshop to address "SORCE Solar Spectral Irradiance Needs for the Modeling Community”. The focus in on meeting the needs of users of SORCE Solar Spectral Irradiance (SSI) data, and will include climate, chemistry, and radiative transfer models.

This informal workshop will include a small number of invited speakers with the primary emphasis on significant discussion on open issues related to implementation of SORCE SSI in a variety of applications.

This workshop is open to the public.

See the June 2006 newsletter for more information.