Magnetic Field and Long-Term Solar Irradiance Variations Over Solar Cycles 21 to 23

Details Magnetic Field and Long-Term Solar Irradiance Variations Over Solar Cycles 21 to 23 Magnetic Field and Long-Term Solar Irradiance Variations Over Solar Cycles 21 to 23

Dec 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003agufmsh32a1099p&link_type=abstract

American Geophysical Union, Fall Meeting 2003, abstract #SH32A-1099

Physics

1650 Solar Variability, 7524 Magnetic Fields, 7536 Solar Activity Cycle (2162), 7538 Solar Irradiance

Scientific paper

Total solar and UV irradiance has been measured from various space platforms over the last two and half solar cycles. Results based on these multi-decade measurements have demonstrated that both total and UV irradiances change on time scales of days to decades, confirming that our Sun is indeed a variable star. High spatial and temporal resolution photometric and magnetic field observations conducted by the SOHO/MDI experiment and also from the ground have demonstrated that the surface of the Sun and its outer atmosphere are highly variable on almost all spatial scales. To understand the physical causes of irradiance variations, it is necessary to study the spatial and temporal characteristics and evolution of the solar magnetic fields and to establish to what extent solar magnetic features may contribute to irradiance variations. In this paper we analyze the total solar and UV irradiance composites compiled from various space measurements starting in late 1978. To establish the effect of surface magnetic activity on irradiance variations as a function of the solar cycle, we show the association of the absolute value of the full disk magnetic field strength data measured and compiled at the National Solar Observatory at Kitt Peak for the time interval of 1978 to date. Using various pattern recognition techniques, we compare the observed irradiance variations with solar features (sunspots and faculae), derived from the MDI and Kitt Peak magnetograms from 1996 and 1992, respectively.

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