Influence of electron nongyrotropy and anisotropy on parallel wave propagation: Numerical solution of dispersion relation |
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| Authors: | FJR Simões MV Alves FR Cardoso E Costa |
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| Institution: | 1. Universidade Federal de Pelotas - UFPel, Dept. de Física/IFM, Campus UFPel Capão do Leão, P.O. Box 354, 96010-900 Pelotas, RS, Brazil;2. National Institute of Space Research - INPE, Associated Plasma Laboratory - LAP, P.O. Box 515, 12227-010 S. J. dos Campos, SP, Brazil;1. Department of Physics, University of Texas at Arlington, TX, USA;2. COSMIC Program Office, University Corporation for Atmospheric Research, Boulder, CO, USA;3. Department of Electrical and Computer Engineering, University of New Mexico, NM, USA;1. Solar-Terrestrial Environment Laboratory, Nagoya University, Nagoya, Japan;2. Centre for Science, Athabasca University, 1 University Drive, Athabasca, Alberta, Canada T9S 3A3;1. Department of Physics, West Virginia University, Morgantown, WV 26506, USA;2. NASA Goddard Space Flight Center, Greenbelt, MD 20771, USA;3. Southwest Research Institute, San Antonio, TX 78228, USA;4. University of Texas at San Antonio, San Antonio, TX 78249, USA;1. Space and Atmospheric Sciences Division, Physical Research Laboratory, Navrangpura, Ahmedabad, India;2. Center for Space Physics, Boston University, Boston, MA, USA;3. Department of Physics and Applied Physics, University of Massachusetts, One University Avenue, Lowell, MA, USA;1. INAF-Istituto di Astrofisica e Planetologia Spaziali, Via del Fosso del Cavaliere 100, 00133, Roma, Italy;2. Istituto Nazionale di Geofisica e Vulcanologia, Via di Vigna Murata 605, 00143 Roma, Italy |
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| Abstract: | This work investigates the influence of a nongyrotropic electron beam on the coupling between the electromagnetic modes of parallel propagation in a background gyrotropic plasma. We explore the importance of the relevant parameters in driving instabilities: the ratio of electron plasma frequency to electron cyclotron frequency, the gyrophase angle, and the temperature anisotropy. We confirm previous results that nongyrotropy can lead to mode coupling for specific values of relevant parameters. More important was to observe that when the anisotropy in the system provides sufficient free energy to start instabilities, the electron nongyrotropy plays an important role to change the growth rate. |
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