Astronomy and Astrophysics – Astronomy
Scientific paper
May 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009spd....40.0926t&link_type=abstract
American Astronomical Society, SPD meeting #40, #9.26; Bulletin of the American Astronomical Society, Vol. 41, p.821
Astronomy and Astrophysics
Astronomy
Scientific paper
The photospheric vector magnetograms, G-band and coronal soft X-ray observations of two flare-quiet active regions, NOAA 10930 and 10963, were well covered by Hinode SOT and XRT observations almost synchronously. The combination of the photospheric/coronal observations and non-linear force free magnetic field extrapolation provides a unique opportunity to study how changes in magnetic energy relate to the corona heating. We study the temporal evolution of free magnetic energy, Poynting flux and total magnetic flux of the active regions during a period of 2-3 days when they were near the solar disk center, and compare them with the evolution of coronal heating properties including soft X-ray brightness, temperature and emission measure. Some techniques are utilized in this study, such as the local correlation tracking, the "minimum energy" method for the 180-degree ambiguity resolution and the optimization method for nonlinear force-free field extrapolation.
Jing Ji-liang
Tan Changyi
Wang Hai-Hong
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