Field-aligned plasmaspheric flows at moderate latitudes |
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| Institution: | 1. Department of Applied and Computational Mathematics, University of Sheffield, Sheffield S10 2TN, U.K.;2. Department of Mathematics, University of Exeter, Exeter EX4 4QE, U.K.;1. Key Laboratory of Aerospace Materials and Performance (Ministry of Education), School of Materials Science and Engineering, Beijing University of Aeronautics and Astronautics, Beijing, People''s Republic of China;2. The Collaborative Innovation Center for Advanced Aero-Engine (CICAAE), Beijing University of Aeronautics and Astronautics, Beijing, People''s Republic of China;3. Beijing Key Laboratory of Advanced Nuclear Materials and Physics, Beijing University of Aeronautics and Astronautics, Beijing 100191, People''s Republic of China;1. Tulane University School of Medicine, New Orleans, LA, USA;2. Tulane University Department of Biomedical Engineering, New Orleans, LA, USA;3. Louisiana State University School of Medicine/Children''s Hospital, New Orleans, LA, USA |
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| Abstract: | In a model of the plasmasphere, coupled time-dependent continuity, momentum and energy equations are solved for thermal O+, H+ and electrons. The field-aligned mass flow coupling and thermal coupling of conjugate ionsopheres via the protonosphere are studied. For solstice conditions, thermal coupling between conjugate hemispheres gives rise to very strong upward flows of O+ in the topside ionosphere of the summer hemisphere at the time of sunrise in the conjugate (winter) ionosphere; a less marked effect (but with downward flow) occurs in the summer ionosphere at winter sunset. In addition, there are strong upward and downward flows of O+ at local sunrise and sunset, respectively, in both hemispheres. At both L = 1.5 and L = 3, the 24-hour time-integrated interhemispheric H+ flux is in the summer - winter direction. At L = 1.5 its magnitude is in good agreement with the magnitude of the time- integrated field-aligned plasma (O+ + H+) flux at 1000 km altitude; there is no such agreement at L = 3. |
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