Astronomy and Astrophysics – Astronomy
Scientific paper
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.
Patrikeeva Irina
Petrie Gordon
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