Astronomy and Astrophysics – Astronomy
Scientific paper
May 2012
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012apj...750l..30s&link_type=abstract
The Astrophysical Journal Letters, Volume 750, Issue 2, article id. L30 (2012).
Astronomy and Astrophysics
Astronomy
Magnetic Reconnection, Methods: Numerical, Plasmas, Sun: General, Sun: Heliosphere
Scientific paper
Current sheets thinner than the ion inertial length are unstable to the tearing instability and will develop magnetic islands that grow due to magnetic reconnection. We investigate whether the growth of magnetic islands in a current sheet can continue indefinitely, or in the case of the heliosheath, until reaching a neighboring current sheet, and at what rate the islands grow. We investigate the development and growth of magnetic islands using a particle-in-cell code, starting from particle noise. Performing a scaling of the growth of magnetic islands versus the system size, we find that the growth rate is independent of the system size up to the largest simulation we were able to complete. The islands are able to continue growing as long as they merge with each other and maintain a high aspect ratio. Otherwise, there is not enough magnetic tension to sustain reconnection. When applied to the sectored magnetic fields in the heliosheath, we show that the islands can continue growing until they reach the sector width and do so in much less time than it takes for the islands to convect through the heliosheath.
Drake James F.
Schoeffler K. M.
Swisdak Michael
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