Electron Acceleration from Electron-Ion Plasma Cloud Moving across a Magnetic Field

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The dynamics of the electron-ion plasma cloud moving perpendicular to an anabient magneticfield in the backgrotrnd plasma is investigated by rneans of a three-ditnensional, electronnagnetic,and relativistic particle simtrlation code. The simtrlation results show that the cloud separatesinto electrons and ions due to their gyrornotions with Larraaor radius of V0/w.j (Up is the initialcloud velocity and w.j is the cyclotron freqtrency of species .j). Conseqtrently, electrornagneticand whistler xvaxzes are excited frona the clotrd due to coherent gyration of cloud electrons. Inaddition, Langmtrir waves are also excited along a magnetic field. It is shown that clotrd electronsare accelerated by Langrntrir waves along the zaaagnetic field and the poptrlation inversion iscreated in the velocity distribtttion of cloud electrons. The acceleration naechanisnu of clotudelectrons is due to Landau resonance between Langmttir waves and cloud electrons. We applyotrr restrlts to the electron acceleration rrtechanistaa frozaa plasnaa clotrd prodtrced near a cornetnucletrs, which unay explain recent observation of X-ray frona comet Hyakutake.
1998-03-15