On the propagation of blobs in the magnetotail: MHD simulations

摘要: [1] Using three-dimensional magnetohydrodynamic (MHD) simulations of the magnetotail, we investigate fate entropy-enhanced localized magnetic flux tubes (“blobs”). Such may be result a slippage process that also generates entropy-depleted (“bubbles”) or rapid energy increase, for instance, from wave absorption. We confirm expectation entropy enhancement leads to tailward motion and speed distance traveled into tail increase with enhancement, even though blobs tend break up pieces. The vorticity on outside twists field field-aligned currents predominantly region-2 sense (earthward dusk side dawn side), which might provide possibility remote identification ground. breakup, however, more turbulent flow patterns, associated opposite generation region-1 lower intensity but approximately equal integrated magnitude.