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Title:
The periodic variation of 6.7 days for total solar radiation
Authors:
Gan, W. Q.; Li, Y. P.
Affiliation:
AA(Purple Mountain Observatory, Chinese Academy of Sciences, Nanjing 210008, China ), AB(Purple Mountain Observatory, Chinese Academy of Sciences, Nanjing 210008, China )
Publication:
Solar and Stellar Variability: Impact on Earth and Planets, Proceedings of the International Astronomical Union, IAU Symposium, Volume 264, p. 84-86
Publication Date:
02/2010
Origin:
CUP
Keywords:
Sun: activity, Sun: magnetic fields, Sun: solar-terrestrial relations
DOI:
10.1017/S1743921309992432
Bibliographic Code:
2010IAUS..264...84G

Abstract

Analyzing the power spectrum of Total Solar Irradiance (TSI) for the period from 2003 February 25 to 2009 July 6, observed with the Total Irradiance Monitor (TIM) onboard SOlar Radiation and Climate Experiment (SORCE), we found that there are quite a number of periodic variations. The outstanding shortest one is the period of 6.7 days, about one fourth of the period of solar rotation. Checking the solar magnetic field for the same period of time observed with MDI onboard SOHO, we found that there is about 90 degree difference in longitude for the distribution of solar magnetic field. We therefore conclude that both the 90 degree difference in longitude for the distribution of solar magnetic field and the solar rotation are the reason resulting in the periodic variation of 6.7 days for the total solar radiation.

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