A Comparison of Sunspot Photometric Indices From Ground-Based Data and MDI/SOHO

Details A Comparison of Sunspot Photometric Indices From Ground-Based Data and MDI/SOHO A Comparison of Sunspot Photometric Indices From Ground-Based Data and MDI/SOHO

Dec 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006agufmsh41a..05c&link_type=abstract

American Geophysical Union, Fall Meeting 2006, abstract #SH41A-05

Physics

7529 Photosphere, 7537 Solar And Stellar Variability (1650), 7538 Solar Irradiance

Scientific paper

Comparing ground-based and space-based sunspot photometric indices is useful in extending the time series for studying variatons in total solar irradiance (TSI). Photometric sunspot indices from CFDT2 images obtained at the San Fernando Observatory have been compared with those from images obtained by MDI/SOHO and the Mauna Loa PSPT. We find very high correlations between them (R greater than about 0.99 for most). However, sunspot darkness is overestimated using MDI images by between 10 to 20 %. A composite sunspot deficit created from red and blue SFO/CFDT2 images correlates well (R =.99, n=53) with deficits from PSPT red images. This work has been partially supported by grants from NASA (NAG5-12905) and the NSF (ATM-0533511).

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