AAS 204th Meeting, June 2004
Session 2 When the Sun Went Wild
SPD Topical Related Poster, Monday, May 31, 2004, 9:20am-6:30pm, Ballroom

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[2.14] The Spots of October 2003: The Largest Irradiance Dip of Cycle 23

G.A. Chapman, A.M. Cookson, D.P. Preminger, S.R. Walton (San Fernando Observatory/CSUN)

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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