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Anthony Watts: The minimal solar activity in 2008–2009 and its implications for long‐term climate modeling
Saturday, March 19th 2011, 7:30 PM UTC
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Total absolute magnetic fluxes on the Sun for three models: solid/blue: flux estimate (Tapping et al., 2007) based on a partitioning between ‘strong field’ and ‘weak field’ components, scaled from sunspot numbers using their equations (1) and (4); dashed/green: a multi‐component flux model (Vieira and Solanki, 2010) (with time‐dependent couplings, multiplied by 1.25 (going back to 1700); diamonds/red: flux‐dispersal model based on the yearly‐average sunspot number (Schrijver et al., 2002), with points from July 1996 onward based on assimilated magnetic maps (Schrijver and DeRosa, 2003) based on SOHO’s MDI (Scherrer et al., 1995) sampled once per 25‐d period. The multipliers are chosen to bring the fluxes around 2000–2003 to a common scale. The horizontal dotted line shows the flux level characteristic of August‐September 2009.

This is a new paper in Geophysical Research Letters by C. J. Schrijver, W. C. Livingston, T. N. Woods, and R. A. Mewaldt. WUWT readers may recognize Livingston as the creator of one of the datasets we regularly follow graphically on our Solar Data and Images reference page.

They reconstruct total solar flux all the way back to 1650, as seen above:

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