Astronomy and Astrophysics – Astrophysics
Scientific paper
Dec 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007agufmng21a0203y&link_type=abstract
American Geophysical Union, Fall Meeting 2007, abstract #NG21A-0203
Astronomy and Astrophysics
Astrophysics
4485 Self-Organization, 7835 Magnetic Reconnection (2723, 7526)
Scientific paper
Magnetized plasma systems are often driven such that excess free energy excites instabilities that cause the system to relax to a lower energy state by self-organizing its large-scale structure. In this magnetic self- organization process, the magnetic field fluctuates in space or time and thus the instabilities are magnetic. Laboratory plasmas which can be driven to a state of high magnetic energy by an applied electric field (such as seen in toroidal pinch devices) often self-organized to a relaxed state. Magnetospheric substorms are driven by the solar wind; solar dynamo and coronal activity may be driven by convection and rotation; magnetic activity in accretion disks may be driven by rotation. The specification of the drive differs between situation, and in some of the phenomena rearrangement of quantities other than the magnetic field may dominate. But, the phenomena share the underlying physics of magnetic self-organization. It has been recognized that "physics-issue-dedicated" laboratory experiments can contribute significantly to the understanding of the fundamental physics for the magnetic self-organization phenomena since they can create fundamental physics processes in a controlled manner and provide well-correlated measurements at multiple locations simultaneously. This paper reviews the findings of recent laboratory experiments which address magnetic reconnection and related physics issues, including two-fluid physics which have been intensively studied in recent decades. This paper also describes the goals and major results from the Center for Magnetic Self-organization to study magnetic self-organization phenomena, a common frontier for both laboratory and space astrophysics research. *In collaboration with the members of the Center for Magnetic Self-Organization.
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