Resistive MHD Modeling of CME Acceleration and Impulsive Magnetic Reconnection

Mathematics – Logic

Scientific paper

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7513 Coronal Mass Ejections, 7519 Flares, 7524 Magnetic Fields

Scientific paper

CME (or Flux rope) acceleration and impulsive magnetic reconnection are modeled by resistive MHD simulations with anomalous resistivity. We discuss the role of nonuniform anomalous resistivity on the time scale of flux rope acceleration and reconnection rate. Our simulation results show that the reconnection electric field reaches a peak value of O(1 keV) for X-class flares during the GOES X-ray flare rise phase, which is consistent with estimates obtained from several observations of two ribbon expansion in flare-CME events. Our simulations provide quantitative agreement with observations of CME acceleration during the flare rise phase and predict an enhanced magnetic reconnection rate during this period. We will discuss the physical scenario of how the phenomenological anomalous resistivity can be created in collisionless turbulent plasmas in the current sheet, how the current sheet can be significantly wider than the ion skin depth, and how particles are accelerated in the globally evolving EM fields with turbulence in the current sheet.

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