Effect of hot ion temperature on obliquely propagating ion-acoustic solitons and double layers in an auroral plasma |
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| Institution: | 1. Department of Physics, University of the Western Cape, Bellville 7535, South-Africa;2. Office of the Deputy Vice Chancellor (Academic), University of the Western Cape, Bellville, South-Africa;3. Indian Institute of Geomagnetism, New Panvel (W), Navi Mumbai, India;1. University of Novi Sad, Faculty of Sciences, Department of Physics, Trg Dositeja Obradovića 4, 21000 Novi Sad, Vojvodina, Serbia;2. Academy of Criminalistic and Police Studies, Cara Dušana 196, 11080 Zemun, Serbia;3. University of Novi Sad, Technical Faculty “M. Pupin”, Đure Đakovića bb, 23000 Zrenjanin, Vojvodina, Serbia;4. Academy of Sciences and Arts of the Republic of Srpska, Bana Lazarevića 1, 78000 Banja Luka, Bosnia and Herzegovina;1. Alibaba Research Center for Complexity Sciences, Hangzhou Normal University, Hangzhou 310036, China;2. Department of Modern Physics, University of Science and Technology of China, Hefei 230026, China;3. Web Sciences Center, University of Electronic Science and Technology of China, Chengdu 610051, China;4. Department of Psychology, University of Graz, Graz 8010, Austria;5. The Research Center for Complex System Science, University of Shanghai for Science and Technology, Shanghai 200093, China;1. School of Mechanical Engineering, Yeungnam University, Kyongsan 712-749, South Korea;2. Collective Dynamics of Complex Systems Research Group, Binghamton University, State University of New York, Binghamton, NY 13902-6000, USA;1. School of Mathematical Sciences, University of Electronic Science and Technology of China, Chengdu, Sichuan 611731, PR China;2. The Department of Electrical and Computer Engineering, The University of Auckland, Private Bag, 92019 Auckland, New Zealand;3. Key Laboratory for Neuroinformation of Ministry of Education, University of Electronic Science and Technology of China, Chengdu, Sichuan 611731, PR China;4. School of Life Sciences and Technology, University of Electronic Science and Technology of China, Chengdu, Sichuan 611731, PR China;1. School of Electronic Information and Electrical Engineering, Shanghai Jiao Tong University, Shanghai 200240, China;2. Laboratory of Intelligent Control and Robotics, Shanghai University of Engineering Science, Shanghai 201620, China |
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| Abstract: | Properties of obliquely propagating ion-acoustic solitons and double layers in a magnetized auroral plasma composed of hot adiabatic ions and two types of, cool and hot Maxwellian electrons are studied using Sagdeev pseudo-potential technique and assuming the quasi-neutrality condition. The new and surprising result which emerges from the model is that in contrast to the case of cold ions where ion-acoustic solitons and double layers are found for subsonic Mach numbers only, the hot ions case allows these nonlinear structures to exist for both subsonic and supersonic Mach number regimes. The double layers exist at lower angle of propagation as hot ion temperature is increased. The soliton electric field amplitudes are increased but their width and pulse duration are decreased with the increase in hot ion temperature. For the auroral zone parameters, the maximum electric field amplitude, width, pulse duration and speed for the solitons come out to be in the range ∼ (0.3–15) mV/m, ∼ (195–455) m, (7–20) ms and (22–26) km/s, respectively. The results seem to be in agreement with the Viking satellite observations in the auroral zone. |
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| Keywords: | Low-frequency waves Magnetized plasma Solitons and double layers Sagdeev pseudopotential Adiabatic ions temperature Cool and hot electrons Mach numbers Auroral zone |
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