Seminars of the Focus Area Complex Systems

Prof. Dr. C. Beta, Prof. Dr. K. Dethloff, Prof. Dr. R. Engbert, Prof. Dr. M. Holschneider, Prof. Dr. W. Huisinga, Prof. Dr. Ralf Metzler, Prof. Dr. A. Pikovsky, Prof. Dr. S. Reich, Prof. Dr. M. Rosenblum, Prof. Dr. G. Rüdiger, Prof. Dr. T. Scheffer, Prof. Dr. F. Scherbaum, Prof. Dr. J. Selbig, Prof. Dr. F. Spahn

Seminar

Speaker: Yuri Litvinenko, Department of Mathematics, University of Waikato, New Zealand

Title: Evolution of the axial magnetic field in solar filament channels

Time: Wed, Jan 27, 2010, 2pm

Place: Building 28, Room 2.100

Abstract:
A key observational condition for solar filament formation is flux cancellation at a polarity inversion line. Magnetic reconnection in the photosphere is the accepted mechanism of cancellation.

An MHD model for magnetic merging in a stagnation-point flow is presented. An exact analytical solution for the time-dependent axial magnetic field profile is derived. The maximum magnetic field in the channel is determined and its dependence on the reconnection inflow speed is discussed.

The results show that the rate of filament channel formation increases in the presence of a stronger magnetic field along the channel, in agreement with recent observations. The observed maximum magnetic field in a channel can serve as an indicator of the photospheric reconnection rate.

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Past NLD Seminars (1994-2007) & (2008 ...)

Students' seminar: Theoretical Physics, PIK, Modeling & TSA Berlin-Potsdam-Colloquia: PhysGesellschaft Berlin, TU Berlin, Pro Physik, AIP, AEI, MPI-KGF, GFZ, HMI, PIK, AWI, Max Planck Institute for the History of Science, Mathematik, DPG Disputationen, & Vorschau UP

Udo Schwarz, Zentrum für Dynamik komplexer Systeme,
Universität Potsdam, Campus Golm Karl-Liebknecht-Str. 24, 14476 Potsdam, building 28, room 2.107
Phone: (+49-331) 977-1658, Fax : (+49-331) 977-1045

Email: Udo.Schwarz AT uni-potsdam.de

DFG SFB 1294

DFG Sonderforschungsbereich 1294 Data assimilation

DFG SPP 1488

DFG Schwerpunktprogramm 1488 Planetmag


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