Physics
Scientific paper
May 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002agusmsh32d..04r&link_type=abstract
American Geophysical Union, Spring Meeting 2002, abstract #SH32D-04
Physics
7507 Chromosphere, 7509 Corona, 7524 Magnetic Fields, 7549 Ultraviolet Emissions
Scientific paper
We study formation of two different coronal loop structures typical to regions overlying the sunspot penumbra: extremely ``quiet'' closed loops and ``open''- fan like - systems. We use coordinated observations from Swedish Vacuum Solar Telescope (SVST) on La Palma, the TRACE satellite and the MDI instrument on SOHO. High resolution MDI magnetograms are assembled in a 6-hour movie and co-aligned with TRACE Fe IX/X 171 Å images of the corona, Hα filtergrams showing plasma motions at the ``chromospheric'' level. This allowed us to follow the process of loop formation from its very early stage and establish links between different stages of the process and dynamic changes in underlying atmosphere. For quantitative analysis we propose a model for the loop formation based on the current drive caused by nonlinear magneto-hydrodynamic coupling between the sunspot magnetic field and velocity field. Farther evolution of loop structures can be described by electric circuit analogue. Plasma conditions in the overlying chromosphere and corona determine the main components of the circuit: resistance, ``inductance'' and capacitance of the system. Depending on these components and the character of the energy source (e.g. electro-mechanical driver in the photosphere) the formed circuit may exhibit either meta-stable oscillatory behavior or be explosively disrupted. We apply these results respectively to closed (meta-stable) loop system and the open (disrupted) structures and find good agreement with properties of the observed events.
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