Long-term variations in total solar and UV irradiancesThe variations of total solar and UV irradiances during solar cycles 21 and 22 are compared. The total solar irradiance data used were obtained by the SMM/active cavity radiometer irradiance monitoring (ACRIM) 1, upper atmosphere research satellite (UARS)/ACRIM 2 and ERBS experiments. The space-based irradiance observations are compared to the Mount Wilson Magnetic Plage and Photometric Sunspot Index, which is derived from the area and position of sunspots published by the NOAA World Data Center Solar Geophysical Data Catalog. It is found that the variations in solar UV irradiance were similar during the maximum and minimum of solar cycles 21 and 22. The possible reasons for the differences in the irradiance values during the minima of the two solar cylces are discussed.
Document ID
19990056493
Acquisition Source
Langley Research Center
Document Type
Conference Paper
Authors
Pap, J. M. (California Univ. Los Angeles, CA United States)
Floyd, L. (Interferometrics, Inc. Chantilly, VA United States)
Lee, R. B. (NASA Langley Research Center Hampton, VA United States)
Parker, D. (California Univ. Los Angeles, CA United States)
Puga, L. (National Oceanic and Atmospheric Administration Boulder, CO United States)
Ulrich, R. (California Univ. Los Angeles, CA United States)
Varadi, F. (California Univ. Los Angeles, CA United States)
Viereck, R. (National Oceanic and Atmospheric Administration Boulder, CO United States)
Date Acquired
August 19, 2013
Publication Date
December 1, 1997
Publication Information
Publication: Proceedings of the 31st ESALB Symposium on Correlated Phenomena at the Sun, in the Heliosphere and in Geospace