Whistler studies of the plasmasphere shape and dynamics |
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| Institution: | 1. Área Académica de Ciencias de la Tierra y Materiales, Universidad Autónoma del Estado de Hidalgo Mineral de la Reforma, 42184 Hidalgo, Mexico;2. Centro de Investigación e Innovación Tecnológica del Instituto Politécnico Nacional, 02250 Ciudad de México, Mexico;3. CONACYT-Corporación Mexicana de Investigación en Materiales, 25290 Saltillo, Coahuila, Mexico;1. Universidad Autónoma de San Luis Potosí, Facultad de Ingeniería, Dr. Manuel Nava No. 8, Zona Universitaria Poniente, 78290 San Luis Potosí, Mexico;2. Universidad Autónoma del Estado de Hidalgo, Área Académica de Ciencias de la Tierra y Materiales, Carr. Pachuca-Tulancingo km. 4.5, 42039 Hidalgo, Mexico;3. Universidad Autónoma de San Luis Potosí, Facultad de Ciencias, Av. Chapultepec 1570, Priv. del Pedregal, 78295 San Luis Potosí, Mexico;1. Materials Science and Engineering, McMaster University, Hamilton, Ontario, Canada;2. Canadian Neutron Beam Centre, Canadian Nuclear Laboratories, Chalk River, Ontario, Canada;3. Brockhouse Institute of Materials Research, McMaster University, Hamilton, Ontario, Canada;1. Department of Physics, Manipal Institute of Technology, Manipal Academy of Higher Education, Manipal, Karnataka 576104, India;2. Indian Institute of Science Education and Research, Bhopal, Madhya Pradesh 462066, India;3. UGC-DAE-Consortium for Scientific Research, Kalpakkam Node, Kokilamedu, Tamil Nadu 603104, India;4. UGC-DAE-Consortium for Scientific Research, Indore Centre, University Campus, Khandwa Road, Indore 452001, India;5. UGC-DAE-Consortium for Scientific Research, Mumbai Centre, BARC Campus, Trombay, Mumbai 400085, India;6. Department of Physics, Manipal Institute of Technology Bengaluru, Manipal Academy of Higher Education, Manipal, Karnataka 576104, India;1. Department of Materials Science and Engineering, Korea University, Seoul 136-713, South Korea;2. Institute of Research and Development, Duy Tan University, Da Nang, Viet Nam;3. Department of Physics and Oxide Research Center, Hankuk University of Foreign Studies, Yongin 449-791, South Korea;4. Physics Division, School of Science Education, Chungbuk National University, Cheongju 361-763, South Korea;5. Department of Physics, Chungbuk National University, Cheongju 361-763, South Korea |
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| Abstract: | Whistler studies of the plasmapause/plasmasphere are traced from their beginnings during the IGY through the early 1960's, when extensive data from Antarctica became available. Highlights of this period include discovery of the ‘knee’ in the equatorial electron density profile, initial comparisons with results from the Lunik probes, identification of magnetic storm effects, and discovery of the duskside bulge, or region of larger plasmasphere radius, as well as smaller-scale (Δφ ≈ 20°) variations in radius with longitude. In the mid-1960's, whistlers provided the first evidence of cross-L plasma drift patterns in the outer plasmasphere. From a present day perspective, the plasmasphere is seen as a region penetrated, perhaps most efficiently in the dusk sector, by the unsteady component of high latitude electric fields. In the pre-dawn sector, post substorm outward drifts may be an aftereffect of the shielding of the plasmasphere against the steadier components of the substorm electric fields. The available indirect whistler evidence of plasmasphere erosion during large disturbances suggests that erosion occurs primarily in the dusk-premidnight sector. |
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