Multimoment convecting flux tube model of the polar wind system with return current and microprocesses |
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| Institution: | 1. Kavli Institute for Astrophysics and Space Research, MIT, Cambridge, MA 02139, USA;2. Belgian Institute for Space Aeronomy, 3 av. Circulaire, B-1180 Brussels, Belgium;3. Center for Atmospheric and space Sciences, Utah State University, 4405 Old Main Hill, Logan, UT 84322-4405, USA;1. Université Versailles St-Quentin, Sorbonne Universités, UPMC Univ. Paris 06, CNRS/INSU, LATMOS-IPSL, 11 Boulevard d’Alembert, 78280 Guyancourt, France;2. Institut Universitaire de France, 103 Bvd. St-Michel, 75005 Paris, France;3. LGPM, Ecole centrale de Paris, Grande voie des Vignes, 92295 Chatenay-Malabry Cedex, France;1. Laboratoire d’Etudes Spatiales et d’Instrumentation en Astrophysique (LESIA), Observatoire de Paris, PSL-Research Univ., CNRS, Univ. Pierre et Marie Curie Paris 06, Sorbonne Univ., Univ. Paris-Diderot, Sorbonne Paris-Cité, 5, place Jules Janssen, 92195 Meudon Cedex, France;2. NASA Goddard Space Flight Center, Greenbelt, MD 20771, USA;3. Department of Astronomy, University of Maryland, College Park, MD 20742, USA;4. Faculty of Physics, National and Kapodistrian University of Athens, Panepistimioupolis, 15783 Zografou, Athens, Greece;5. GSMA, Université Reims Champagne-Ardenne, France;6. School of Earth Sciences, University of Bristol, Bristol BS8 1RJ, UK;1. Aix-Marseille Université, CNRS, PIIM, UMR 7345, 13013 Marseille, France;2. Ice Spectroscopy Lab, Science Division, Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA 91109, USA;1. Department of Physics, Catholic University of America, Washington, DC 20064, USA;2. Moscow Institute of Physics and Technology (PhysTech), Moscow, Russia;1. Pushkov Institute of Terrestrial Magnetism, Ionosphere, and Radiowave Propagation, Russian Academy of Sciences (IZMIRAN), 142190 Kaluzhskoe shosse, 4, Troitsk, Moscow, Russia;2. Institute of Space Science, National Central University, No. 300, Jung-Da Rd, Chung-Li City, Taoyuan 32001, Taiwan;3. Center for Space and Remote Sensing Research, National Central University, Chung-Li, Taiwan;4. National Space Program Organization, Hsin-Chu, Taiwan |
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| Abstract: | Multimoment fluid simulation frameworks, which effectively account for anomalous transport due to microprocesses, combine best features of small-scale kinetic and global-scale MHD models. The most practical models of this type, 1D flux tube models, have been successfully used for realistic simulations of space plasmas including polar wind and magnetosphere–ionosphere coupling processes characterized by a wide range of temporal and spatial scales. Our earlier flux tube models with field-aligned current and microprocesses have been formulated for spatially stationary flux tubes. However, horizontal convection due to electric fields is an important aspect of the high-latitude ionosphere–polar wind system and typical time scales of the polar wind upflow are comparable to the transit time across the polar cap. To take into account this important feature we have added flux tube convection to our earlier model. Using typical convecting flux tube that starts outside auroral oval, then enters and leaves downward current region, it has been shown that anomalous transport effects due to current-driven microinstabilities significantly alter dynamics of several plasma moments and should be taken into account for an accurate interpretation and prediction of the observed data. Future applications of our new model have also been discussed. |
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