Numerical modeling of the light ion trough and heat balance of the topside ionosphere in quiet geomagnetic conditions |
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| Institution: | 1. Department of Physics, Kaliningrad State Technical University, Sovetsky Avenue, 1, Kaliningrad 236000, Russian Federation;2. West Department of IZMIRAN, Pobedy Avenue, 41, Kaliningrad 236017, Russian Federation;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. Center for Atmospheric and Space Sciences, Utah State University, 4405 Old Main Hill, Logan, UT 84322?4405, USA;2. Abastumani Astrophysical Observatory at Ilia State University, 3 Giorgi Tsereteli Str., Tbilisi 0162, Georgia |
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| Abstract: | The results from the numerical calculations of the global distribution of topside ionospheric parameters such as H+ ions and ion and electron temperatures up to 1500 km height are presented for equinoctial conditions at solar minimum. Calculations are carried out using the Global Self-consistent Model of Thermosphere, Ionosphere and Protonosphere (GSM TIP) developed in WD IZMIRAN, and using a new calculation block for electric fields due to dynamo and of magnetospheric origin. A comparison of two sets of calculations of magnetospheric convection electric field for a given potential difference is carried out, one through polar caps and other through field aligned currents of first zone. It is shown that the distribution of the electric potential obtained through field aligned currents of first zone is more self-consistent than that through polar caps. The light ion trough in H+ ions is deeper and occupies larger region for the potential difference through polar cap. For a given potential difference through field aligned current, at 1500 km, the maximum ion temperature is 150 K higher, minimum ion temperature is 200 K lower and maximum electron temperature is 100 K higher than those obtained for the same potential difference through polar caps. It is concluded that for modeling the electric field of magnetospheric origin, it is necessary to use the potential difference through field aligned current of first zone instead of through polar caps. |
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