File:Fivianetal2008.jpg

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Comparison of oblateness measurements from space. Here, we compare the RHESSI oblateness measurement, representing data from 29 June to 24 September 2004 (red crosses), with the best earlier values, namely the balloon-borne Solar Disk Sextant (SDS) experiment (green diamonds) (13) and the MDI instrument on board SOHO (blue triangles) (12). The surface rotation rate predicts the value shown with the dotted line. The histogram (scaled to the uniform rotation oblateness at solar minimum and to the higher MDI data point) shows the radio flux index F10.7, a good indicator of the solar cycle. All errors are +/-1 sigma.

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