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SOLAR SCIENCE
The Sun's Almost Perfectly Round Shape Baffles Scientists
by Staff Writers
Manoa HI (SPX) Aug 20, 2012


Image of the sun taken by the Solar Dynamics Observatory. Credit: NASA.

The sun is nearly the roundest object ever measured. If scaled to the size of a beach ball, it would be so round that the difference between the widest and narrow diameters would be much less than the width of a human hair.

The sun rotates every 28 days, and because it doesn't have a solid surface, it should be slightly flattened. This tiny flattening has been studied with many instruments for almost 50 years to learn about the sun's rotation, especially the rotation below its surface, which we can't see directly.

Now Jeff Kuhn and Isabelle Scholl (Institute for Astronomy, University of Hawaii at Manoa), Rock Bush (Stanford University), and Marcelo Emilio (Universidade Estadual de Ponta Grossa, Brazil) have used the Helioseismic and Magnetic Imager (HMI) onboard the Solar Dynamics Observatory satellite to obtain what they believe is the definitive--and baffling--answer.

Because there is no atmosphere in space to distort the solar image, they were able to use HMI's exquisite image sensitivity to measure the solar shape with unprecedented accuracy.

The results indicate that if the Sun were shrunk to a ball one meter in diameter, its equatorial diameter would be only 17 millionths of a meter larger than the diameter through its North-South pole, which is its rotation axis.

They also found that the solar flattening is remarkably constant over time and too small to agree with that predicted from its surface rotation. This suggests that other subsurface forces, like solar magnetism or turbulence, may be a more powerful influence than expected.

Kuhn, the team leader and first author of an article published in Science Express, said, "For years we've believed our fluctuating measurements were telling us that the sun varies, but these new results say something different.

"While just about everything else in the sun changes along with its 11-year sunspot cycle, the shape doesn't."

This work was supported by NASA grants to Stanford University and the University of Hawaii.

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Related Links
Institute for Astronomy, University of Hawaii
SDO at Goddard
SDO at NASA
Solar Science News at SpaceDaily






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New Report Presents Research Program for Solar and Space Physics Over the Next Decade
Washington DC (SPX) Aug 20, 2012
A new report from the National Research Council presents a prioritized program of basic and applied research for 2013-2022 that will advance scientific understanding of the sun, sun-Earth connections and the origins of "space weather," and the sun's interactions with other bodies in the solar system. This second decadal survey in solar and space physics - the product of a 18-month effort b ... read more


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