Emergence of an active region with SDO: the first eight hours

Details Emergence of an active region with SDO: the first eight hours Emergence of an active region with SDO: the first eight hours

Dec 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010agufmsh11a1612r&link_type=abstract

American Geophysical Union, Fall Meeting 2010, abstract #SH11A-1612

Astronomy and Astrophysics

Astrophysics

[7509] Solar Physics, Astrophysics, And Astronomy / Corona, [7524] Solar Physics, Astrophysics, And Astronomy / Magnetic Fields, [7594] Solar Physics, Astrophysics, And Astronomy / Instruments And Techniques

Scientific paper

We report on the high resolution and high cadence observations of the birth of an active region in a supergranular cell. We use SDO/AIA EUV images to derive the evolution of the thermal properties, and SDO/HMI continuum images and line-of-sight magnetograms to study the time evolution of the magnetic polarities forming a pore. We restrict our study to the first eight hours of the emergence. With the broad temperature coverage of SDO/AIA, we determine the shift in time of appearance of loops in the different EUV channels and compare to the evolution of the photospheric magnetic field. We also observe the evolution of the thermal shielding of the active region with respect to the pre-existing corona. We combine the continuum images and magnetograms to explain the formation of a pore about six hours after the beginning of the flux emergence. Using a time series of potential field extrapolations at full spatial resolution using SDO/HMI magnetograms during the eight hours, we study the change of connectivity and magnetic topology associated with the emergence process: starting from field lines connecting the boundaries of the supergranules in a complex manner, the magnetic field becomes more and more bipolar.We also provide a lower and upper estimate of the magnetic energy inside the active region and therefore of the free magnetic energy that can be released.

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