Astronomy and Astrophysics – Astrophysics
Scientific paper
May 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agusmsp31b..07l&link_type=abstract
American Geophysical Union, Spring Meeting 2008, abstract #SP31B-07
Astronomy and Astrophysics
Astrophysics
7500 Solar Physics, Astrophysics, And Astronomy, 7507 Chromosphere, 7524 Magnetic Fields, 7529 Photosphere
Scientific paper
The solar magnetic field controls coronal activity and the solar wind. The physical process of the coronal response to the magnetic field at its lower boundary is far from fully understood. In observational analyses and coronal modeling studies, commonly used observational data are single-height photospheric magnetograms. Comparative studies of photospheric and chromospheric magnetic field properties may shed light on the question of how magnetic fields from below impact the corona. In this study, we report our preliminary analysis of recently available photospheric and chromospheric magnetograms by the NSO SOLIS project. From full disc magnetograms, we select regions of interest near the disc center, including emerging, stable and decaying active regions, and quiet Sun regions. We comparatively analyze the motions of the field derived from local correlation tracking, as well as magnetic flux content and distribution at two heights. We also perform potential and non- linear-force-free extrapolations from a few regions when photospheric vector field data are available, and make comparison between the modeled and observed choromospheric line-of-sight fields. Where applicable, we relate our results to solar activity from the associated region. While caveats and uncertainties remain due to technical issues for observations and calibrations, our study may also serve as part of the effort towards improved use of chromospheric magnetograms.
Bercik David John
Li Yadong
Luhmann Janet G.
Lynch Benjamin J.
McTiernan James M.
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