The Spots of October 2003: The Largest Irradiance Dip of Cycle 23

Details The Spots of October 2003: The Largest Irradiance Dip of Cycle 23 The Spots of October 2003: The Largest Irradiance Dip of Cycle 23

May 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004aas...204.0214c&link_type=abstract

American Astronomical Society Meeting 204, #02.14; Bulletin of the American Astronomical Society, Vol. 36, p.669

Astronomy and Astrophysics

Astronomy

Scientific paper

In October 2003, two large active regions rotated onto the solar disk. During their transit across the disk, a third region emerged and rapidly grew. These active regions produced the largest decrease (over 4 W/m2) in the total solar irradiance (TSI) for cycle 23. Irradiance variations derived from ground-based photometry have been compared with the TSI record from the TIM/SORCE experiment. We find that ground-based irradiance variations due to sunspots and faculae/network are correlated with the TIM/SORCE TSI with a multiple correlation coefficient R2 = 0.9754 for an eight-month interval from 1 June 2003 to 31 January 2004. The residuals between the TIM/SORCE TSI and the ground-based data had a daily rms of approximately 80 ppm. The value of the quiet Sun irradiance was found to be 1361.3 ± 0.1 W/m2. This work was partially supported by grants from NASA and NSF.

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