Statistics – Computation
Scientific paper
Dec 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009agufmsm43b1768r&link_type=abstract
American Geophysical Union, Fall Meeting 2009, abstract #SM43B-1768
Statistics
Computation
[0545] Computational Geophysics / Modeling, [2723] Magnetospheric Physics / Magnetic Reconnection, [7526] Solar Physics, Astrophysics, And Astronomy / Magnetic Reconnection, [7863] Space Plasma Physics / Turbulence
Scientific paper
Recently, secondary island formation due to the tearing instability of the Sweet-Parker current sheet was identified as a possible mechanism that can lead to fast reconnection (less sensitive dependence on Lundquist number S) both in numerical simulations using Particle-in-Cell (PIC) method [Daughton et al. 2009], as well as using resistive magnetohydrodynamics (MHD) [Lapenta 2008; Bhattacharjee et al. 2009]. This instability is thought to appear when S is greater than a certain threshold. These recent results prompt us to perform more resistive MHD simulations of a basic reconnection configuration based on the island coalescence instability, using much higher resolutions and larger S, since secondary island formation has not been observed before for S smaller than the order of 104. Our simulations are based on a fairly standard pseudo spectral code, which has been well tested for accuracy, convergence, and compared well with codes using other methods [Ng et al. 2008]. Based on the experience in our simulations, we argue that a highly accurate simulation is important since secondary islands have been observed to form due to numerical inaccuracy. Latest results based on simulations with S close to 105 will be presented. This work is supported by a NASA grant NNX08BA71G.
Ng Cindy
Ragunathan S.
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