Astronomy and Astrophysics – Astronomy
Scientific paper
May 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aas...210.2901d&link_type=abstract
American Astronomical Society Meeting 210, #29.01; Bulletin of the American Astronomical Society, Vol. 39, p.137
Astronomy and Astrophysics
Astronomy
Scientific paper
We have performed numerical simulations of a bipolar active region embedded in a dipolar background field and subjected to twisting footpoint displacements concentrated near its polarity inversion lines. These displacements preserve the initial radial flux distribution at the inner surface of our spherical domain while introducing strong magnetic shear between the region’s two polarity concentrations. The dipole moments of the active region and the background field are antiparallel and aligned with the Sun’s polar axis, so that the initially potential magnetic field has a null point in the corona above the equator. This configuration is vulnerable to magnetic breakout eruptions, which occur in our MHD simulations and exhibit three novel features not previously found in our studies of coronal mass ejection initiation. First, the eruptions are multiple and homologous, i.e., as a consequence of the flare reconnection that follows each eruption, the coronal null point reforms above the equator, setting the stage for the subsequent onset of a new episode of breakout reconnection and eruption driven by the ongoing footpoint motions. Second, the eruptions are confined, that is, the highest lying, rapidly rising, strongly sheared field lines of the active region do not escape the Sun but instead come to rest in the outer corona well above the reforming null point, forming a large transequatorial loop. Third, the lowest lying, strongly sheared field lines of the active region are very flat prior to the eruption and, after expanding upward sharply during the event, return to their flat configuration within just a few hours, consistent with filament disappearance and prompt reformation. All of these features of our simulations - homology, confinement, and reformation - are commonly observed aspects of the Sun’s eruptive activity. NASA and ONR sponsored this research.
Antiochos Spiro K.
DeVore Richard C.
No associations
LandOfFree
Homologous Confined Filament Eruptions via Magnetic Breakout 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 Homologous Confined Filament Eruptions via Magnetic Breakout, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Homologous Confined Filament Eruptions via Magnetic Breakout will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1029682