Model simulation of the equatorial electrojet in the Peruvian and Philippine sectors |
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| Institution: | 1. High Altitude Observatory, National Center for Atmospheric Research, P.O. Box 3000, Boulder, CO 80307-3000, USA;2. Institute of Space Science, National Central University, No. 300, Joongda Road, Jhongli City, Taoyuan County 32001, Taiwan;3. Plasma and Space Science Center, National Cheng Kung University, No. 1, University Road, Tainan City 701, Taiwan;4. Energy and Resources Group, University of California, Berkeley, 310 Barrows Hall, Berkeley, CA 94720-3050, USA;1. University of Sheffield, Sheffield S1 3JD, UK;2. Bulgarian Academy of Sciences, 1113 Sofia, Bulgaria;3. Hokkaido University, 060-0810 Sapporo, Japan;4. National Cheng-Kung University, Taiwan City 701, Taiwan;5. Kyoto University, Uji, Kyoto 611-0011, Japan;1. Catholic University of America, USA;2. NASA GSFC, USA;3. University of Colorado Boulder LASP, USA;1. Air Force Research Laboratory, Space Vehicles Directorate, Kirtland AFB, New Mexico, USA;2. Department of Electric and Computer Engineering, University of New Mexico, Albuquerque, NM, USA;3. Configurable Space Microsystems Innovations & Applications Center, Albuquerque, NM, USA;4. Center for Space Sciences, University of Texas at Dallas, Richardson, TX, USA;5. The Johns Hopking University, Applied Physics Laboratory, Laurel, MD, USA;1. LPP/UPMC/Polytechnique/CNRS, UMR 7648, University Pierre and Marie Curie Paris 6, 5 place Jussieu, 75005, France;2. LA2I/EMI/University Mohammed V Agdal Rabat, Avenue Ibnsina B.P. 765, Rabat, Morocco;3. T/ICT4D, ICTP – International Centre for Theoretical Physics, Strada Costiera, 11, I-34151 Trieste, Italy;4. MO – Dépt. Micro-Ondes//Lab-STICC/UMR CNRS 6285 – Télécom Bretagne Technopole de Brest-Iroise, 29285 Brest, France;1. Physics Department, Mbarara University of Science and Technology, P.O Box 1410, Mbarara, Uganda;2. T/ICT4D Laboratory of the Abdus Salam International Center for Theoretical Physics, 34151 Trieste, Italy;3. South African National Space Agency (SANSA) Space Science, 7200 Hermanus, South Africa;4. Department of Physics and Electronics, Rhodes University, 6140 Grahamstown, South Africa |
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| Abstract: | Between 100 and 120 km height at the Earth's magnetic equator, the equatorial electrojet (EEJ) flows as an enhanced eastward current in the daytime E region ionosphere, which can induce a magnetic perturbation on the ground. Calculating the difference between the horizontal components of magnetic perturbation (H) at magnetometers near the equator and about 6–9° away from the equator, ΔH, provides us with information about the strength of the EEJ. The NCAR Thermosphere–Ionosphere–Electrodynamics General Circulation Model (TIE-GCM) is capable of simulating the EEJ current and its magnetic perturbation on the ground. The simulated diurnal, seasonal (March equinox, June solstice, December solstice), and solar activity (F10.7=80, 140 and 200 units) variations of ΔH in the Peruvian (76°W) and Philippine (121°E) sectors, and the relation of ΔH to the ionospheric vertical drift velocity, are presented in this paper. Results show the diurnal, seasonal and solar activity variations are captured well by the model. Agreements between simulated and observed magnitudes of ΔH and its linear relationship to vertical drift are improved by modifying the standard daytime E region photoionization in the TIE-GCM in order to better simulate observed E region electron densities. |
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