Statistics – Applications
Scientific paper
May 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002agusmsh32a..01l&link_type=abstract
American Geophysical Union, Spring Meeting 2002, abstract #SH32A-01
Statistics
Applications
7538 Solar Irradiance, 1620 Climate Dynamics (3309), 1640 Remote Sensing, 1650 Solar Variability, 1704 Atmospheric Sciences
Scientific paper
During the 1978-2002, the total solar irradiance (TSI) was monitored using spacecraft radiometers, at the 0.01% precision level. The TSI measurements revealed long-term variations of the order 0.1%, which varied directly with solar magnetic activity associated with the 10-year sunspot cycle. From the Earth Radiation Budget Satellite (ERBS), the NASA Earth Radiation Budget Experiment (ERBE) active cavity radiometer (ACR) solar monitor was used to define 1365 Wm-2 level as the quiet sun magnitude of the TSI, normalized to the mean earth-sun distance. Earlier spacecraft TSI measurements were performed from the 1978-1993, Nimbus-7 and 1980-1989, Solar Maximum Mission [SMM] platforms which yielded higher TSI magnitudes of 1372 and 1367 Wm-2, respectively. Later TSI spacecraft experiments such as the Upper Atmosphere Research Satellite [UARS], European Retrievable Carrier (EURECA), Solar and Heliospheric Observatory [SOHO]/VIRGO, Space Shuttle Atmospheric Laboratory for Applications and Science [ATLAS], and AcrimSat ACR measurements confirmed that 1365 Wm-2 is the most likely TSI magnitude. Recent ERBS, AcrimSat, and VIRGO TSI measurements indicate that the TSI peaked in the 1999-2001; and that, after late 2001, the TSI appears to be decreasing to minimum levels. In this paper, 1984-2002, ERBS/ERBE solar monitor measurements are inter-compared with those from the other spacecraft missions to identify long-term TSI trends.
Lee Robert B.
Wilson Stephen R.
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