Scaling the energy conversion rate from magnetic field reconnection to different bodies

Author
Keywords
Abstract
<p>Magnetic field reconnection is often invoked to explain electromagnetic energy conversion in planetary magnetospheres, stellar coronae, and other astrophysical objects. Because of the huge dynamic range of magnetic fields in these bodies, it is important to understand energy conversion as a function of magnetic field strength and related parameters. It is conjectured theoretically and shown experimentally that the energy conversion rate per unit area in reconnection scales as the cube of an appropriately weighted magnetic field strength divided by the square root of an appropriately weighted density. With this functional dependence, the energy release in flares on the Sun, the large and rapid variation of the magnetic flux in the tail of Mercury, and the apparent absence of reconnection on Jupiter and Saturn, may be understood. Electric fields at the perihelion of the Solar Probe Plus mission may be tens of V/m.</p>
Year of Publication
2010
Journal
Physics of Plasmas
Volume
1726324115275
Number of Pages
102906
Date Published
10/2010
ISSN Number
1070-664X
URL
http://aip.scitation.org/doi/10.1063/1.3504224http://aip.scitation.org/doi/pdf/10.1063/1.3504224
DOI
10.1063/1.3504224