Summary: COMPARISON OF TOTAL SOLAR IRRADIANCE WITH NASA/NATIONAL SOLAR OBSERVATORY
SPECTROMAGNETOGRAPH DATA IN SOLAR CYCLES 22 AND 23
Harrison P. Jones
NASAGoddard Space Flight Center, Laboratory for Astronomy and Solar Physics, Southwest Solar Station, c/o National Solar Observatory, 1
P.O. Box 26732, Tucson, AZ 85726; hjones@noao.edu
Detrick D. Branston
National Solar Observatory, P.O. Box 26732, Tucson, AZ 86726; dbranston@noao.edu
Patricia B. Jones
University of Arizona, Center for Computing and Information Technology, Tucson, AZ 85721; pjones@jemez.rc.arizona.edu
and
Miruna D. Popescu 2
Astronomical Institute of the Romanian Academy, RO­75212 Bucharest 28, Romania; mdp@star.arm.ac.uk
Received 2002 December 9; accepted 2003 January 30
ABSTRACT
NASA/National Solar Observatory Spectromagnetograph (SPM) data are compared with spacecraft
measurements of total solar irradiance (TSI) variations for 8 yr beginning with the declining phase of solar
cycle 22 and extending into the maximum of cycle 23. Previously reported conclusions based on a similar
comparison for a shorter time period appear to be robust: three factors (sunspots, strong unipolar regions,
and strong mixed­polarity regions) describe most of the variation in the SPM record, but only the first two
are associated with TSI. Additionally, the residuals of a linear multiple regression of TSI against SPM obser­

Source: Armagh Observatory

Collections: Physics