Cartesian Hall-MHD: Effect of collisions
{"Image DocumentName": "Cartesian Hall-MHD: Effect of collisions", "Image ImageDescription": "Scan in hyper-resistivity (collisions) \u03b7H = Stable. Weaker collisionality. \u03b7H = Island (ejected in toroidal geometry). Grid: \u2206Rmin = 4x10-4 m, \u2206Zmin = 2x10-4 m. However, there are some differences from the standard picture. The current sheet is extended in the outflow direction, and so is unstable to island formation. Here the magnetic pressure within the island causes the reconnection to stall. The island isn t ejected because of a symmetry that is present in the Hal. Also the reconnection rate, plotted here has some dependence on the dissipation. \u03b7H = Localised CS: \u03b4 = 4.5 mm. \u03c1is = 2.9 cm. Grid: \u2206Rmin = 1x10-4 m, \u2206Zmin = 4x10-5 m. However, large aspect ratio current sheet is unstable to island formation (for \u03b7H \u2264 10-8). In Cartesian geometry a central island stalls the reconnection. Stronger BT: weaker density asymmetry. Multiple, shorter wavelength islands. Order 1 density variations in quadrupole structure. Electrons accelerated in low density regions. Similar to reduced two-fluid reconnection model of Kleva et al", "Image XResolution": "37", "Image YResolution": "37", "Image ResolutionUnit": "Pixels/Centimeter", "Image Software": "SlidePlayer", "Image YCbCrPositioning": "Centered"}