Astronomy and Astrophysics – Astronomy
Scientific paper
Jul 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010aspc..424...28d&link_type=abstract
Proceedings of the 9th International Conference of the Hellenic Astronomical Society, proceedings of a conference held 20-24 Sep
Astronomy and Astrophysics
Astronomy
Scientific paper
We simulate flaring events through a Cellular Automaton (CA) model, in which, for the first time, we use observed vector magnetograms as initial conditions. After non-linear force free extrapolation of the magnetic field from the vector magnetograms, we identify magnetic discontinuities, using two alternative criteria: (1) the average magnetic field gradient, or (2) the normalized magnetic field curl (i.e. the current). Magnetic discontinuities are identified at the grid-sites where the magnetic field gradient or curl exceeds a specified threshold. We then relax the magnetic discontinuities according to the rules of Lu and Hamilton (1991) or Lu et al. (1993), i.e. we redistribute the magnetic field locally so that the discontinuities disappear. In order to simulate the flaring events, we consider several alternative scenarios with regard to: (1) The threshold above which magnetic discontinuities are identified (applying low, high, and height-dependent threshold values); (2) The driving process that occasionally causes new discontinuities (at randomly chosen grid sites, magnetic field increments are added that are perpendicular (or may-be also parallel) to the existing magnetic field). We address the question whether the coronal active region magnetic fields can indeed be considered to be in the state of self-organized criticality (SOC).
Dimitropoulou Michaila
Georgoulis Manolis
Isliker Heinz
Vlahos Loukas
No associations
LandOfFree
Simulating Flaring Events via an Intelligent Cellular Automata Mechanism does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Simulating Flaring Events via an Intelligent Cellular Automata Mechanism, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Simulating Flaring Events via an Intelligent Cellular Automata Mechanism will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-953785