In-situ observations of magnetospheric electron scattering by a VLF transmitter |
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| Affiliation: | 1. School of Environmental Studies and Hubei Key Laboratory of Yangtze Catchment Environmental Aquatic Science, China University of Geosciences, Wuhan 430078, China;2. State Key Laboratory of Biogeology and Environmental Geology, China University of Geosciences, Wuhan 430078, China;3. Institute of Geological Survey, China University of Geosciences, Wuhan 430074, China;4. School of Environment and Engineering, Hubei Land Resources Vocational College, Wuhan 430090, China;5. Geological Environmental Centre of Hubei Province, Wuhan 430034, China;6. Hubei Key Laboratory of Resources and Eco-Environment Geology, Hubei Geological Bureau, Wuhan, 430034;7. National Experimental Teaching Demonstration Center of Water Conservancy and Environmental Engineering, China Three Gorges University, Yichang 443002, China;8. Hubei School of Environmental Science and Engineering, Hubei Key Laboratory of Mine Environmental Pollution Control and Remediation, Hubei Polytechnic University, Huangshi 435003, China;9. Shandong Institute of Geological Survey, Jinan 250013, China;10. Ecological Environment Monitoring Station, Ninth Division, Xinjiang Production and Construction Corps, Tacheng, Xinjiang 834601, China;1. Division of Physics, School of Advanced Sciences, Vellore Institute of Technology (VIT) Chennai, Vandalur - Kelambakkam Road, Chennai, 600 127, India;2. Department of Semiconductor Science, Dongguk University-Seoul, Seoul, 04620, Republic of Korea;3. Quantum-functional Semiconductor Research Center, Dongguk University-Seoul, Seoul, 04620, Republic of Korea;1. Dassault Systèmes, 343 Sansome St San Francisco, CA, USA;2. Equinor ASA, Sandslivegen 90, 5254, Sandsli, Norway;3. Equinor ASA, Arkitekt Ebbells Veg 10, 7053, Ranheim, Trondheim, Norway |
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| Abstract: | High resolution pitch angle measurements of outer zone electrons in the energy range 12 keV−1.6 MeV were obtained at high altitude in the region of the high power VLF transmitter UMS [300 kW radiated at 17.1 kHz (Watt A. D., 1967, VLF Radio Engineering, Pergamon Press, Oxford)] while a resonant wave-particle interaction was in progress. Additional complementary electron measurements in the range of 36–316 keV were obtained in the drift loss cone by another satellite at low altitude along the drift path 75° east of the interaction region. The data from the low-altitude satellite confirm that UMS was precipitating particles in the inner zone, in the slot, and in the outer zone at the time that the high-altitude satellite was obtaining its data. The high-altitude pitch angle distributions indicate that, for this event, two types of scattering interactions were in progress. Particles with small pitch angles, up to 17.2° at the Equator, were being removed, resulting in an enhanced loss cone. Particles which were mirroring between 6500 km and the altitude of the spacecraft (7200) km were also being strongly scattered, resulting in a relative minimum in the pitch angle distribution around 90°. The data are interpreted as indicating that a cyclotron mode interaction with UMS waves was precipitating electrons with equatorial pitch angles up to 17.2° and that another process, perhaps electrostatic (ES) waves arising from the UMS radiations through a mode-conversion process, was present in the region above 6500 km and was efficiently scattering those particles which mirrored in that region |
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