A Comparative Study of Magnetic Fields in the Solar Photosphere and Chromosphere at Low and Polar Latitudes

Details A Comparative Study of Magnetic Fields in the Solar Photosphere and Chromosphere at Low and Polar Latitudes A Comparative Study of Magnetic Fields in the Solar Photosphere and Chromosphere at Low and Polar Latitudes

May 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009spd....40.0924p&link_type=abstract

American Astronomical Society, SPD meeting #40, #9.24; Bulletin of the American Astronomical Society, Vol. 41, p.821

Astronomy and Astrophysics

Astronomy

Scientific paper

The SOLIS Vector-Spectromagnetograph produces full-disk line-of-sight (LOS) magnetic flux images deriving from both photospheric and chromospheric layers on a daily basis. We investigate key properties of the magnetic field in these two layers using more than five years of VSM data. We find from near-equatorial measurements that the East-West inclination angle of most photospheric fields is about 12°, while chromospheric fields expand in all directions to a significant degree. Using a simple stereoscopic inversion we find evidence that photospheric polar fields are also nearly radial, but that during 2008 the chromospheric field in the south pole was expanding super-radially. We obtain a spatially-resolved polar photospheric flux distribution up to 80° latitude whose strength increases poleward approximately as cosine(colatitude) to the power 9-10. This distribution would give a polar field strength of 5-6 G. These results have implications for future synoptic map construction and global modeling.
This work is carried out through the National Solar Observatory Research Experiences for Undergraduate (REU) site program, which is co-funded by the Department of Defense in partnership with the National Science Foundation REU Program.

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