3D PiC code investigations of Auroral Kilometric Radiation mechanisms
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Efficient (similar to 1%) electron cyclotron radio emissions are known to originate in the X mode from regions of locally depleted plasma in the Earths polar magnetosphere. These emissions are commonly referred to as the Auroral Kilometric Radiation (AKR). AKR occurs naturally in these polar regions where electrons are accelerated by electric fields into the increasing planetary magnetic dipole. Here conservation of the magnetic moment converts axial to rotational momentum forming a horseshoe distribution in velocity phase space. This distribution is unstable to cyclotron emission with radiation emitted in the X-mode. Initial studies were conducted in the form of 2D PiC code simulations  and a scaled laboratory experiment that was constructed to reproduce the mechanism of AKR. As studies progressed, 3D PiC code simulations were conducted to enable complete investigation of the complex interaction dimensions. A maximum efficiency of 1.25% is predicted from these simulations in the same mode and frequency as measured in the experiment. This is also consistent with geophysical observations and the predictions of theory.
Gillespie , K M , McConville , S L , Speirs , D C , Ronald , K , Phelps , A D R , Bingham , R , Cross , A W , Robertson , C W , Whyte , C G , He , W , Vorgul , I , Cairns , R A & Kellett , B J 2014 , 3D PiC code investigations of Auroral Kilometric Radiation mechanisms . in 15th International Congress on Plasma Physics (ICPP2010) & 13th Latin American Workshop on Plasma Physics (LAWPP2010) . Journal of Physics Conference Series , vol. 511 , IOP Publishing Ltd. , Bristol , 15th International Congress on Plasma Physics (ICPP) / 13th Latin American Workshop on Plasma Physics (LAWPP) , Chile , 8-13 August . DOI: 10.1088/1742-6596/511/1/012051conference
15th International Congress on Plasma Physics (ICPP2010) & 13th Latin American Workshop on Plasma Physics (LAWPP2010)
© 2014 The Authors. Published under licence by IOP Publishing Ltd. The following article appeared in K M Gillespie et al 2014 J. Phys.: Conf. Ser. 511 012051 and may be found at http://iopscience.iop.org/1742-6596/511/1/012051. Content from this work may be used under the terms of the Creative Commons Attribution 3.0 licence. Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI.