Solnechno-Zemnaya Fizika Solnechno-Zemnaya Fizika Солнечно-земная физика 2712-9640 13888 10.12737/22595 Результаты исследований Results of current research Результаты исследований Modeling the influence of magnetospheric heat fluxes on the electron temperature in the subauroral ionosphere Моделирование влияния магнитосферных потоков тепла на температуру электронов в субавроральной ионосфере https://orcid.org/0000-0003-2184-8089 Гололобов Артем Юрьевич Gololobov Artem Yuryevich golart87@gmail.com

кандидат физико-математических наук;

candidate of physical and mathematical sciences;

 Голиков Иннокентий Алексеевич Golikov Innokentiy Alekseevich gia2008@mail.ru

доктор физико-математических наук;

doctor of physical and mathematical sciences;

 Варламов Илья Ильич Varlamov Ilya Ilyich varlamovi@mail.ru Институт космофизических исследований и аэрономии им. Ю.Г. Шафера СО РАН Якутск Россия Yu.G. Shafer Institute of Cosmophysical Research and Aeronomy SB RAS Yakutsk Russian Federation Северо-Восточный федеральный университет им. М.К. Аммосова Якутск Россия North-Eastern Federal University Yakutsk Russian Federation Институт космофизических исследований и аэрономии им. Ю.Г. Шафера СО РАН Якутск Россия Yu.G. Shafer Institute of Cosmophysical Research and Aeronomy SB RAS Yakutsk Russian Federation Северо-Восточный федеральный университет имени М.К. Аммосова M. K. Ammosov North-Eastern Federal University 15 11 2016 15 11 2016 3 2 54 57 https://zh-szf.ru/en/nauka/article/13888/view

Представлены результаты моделирования распределения температуры электронов в области F субавроральной ионосферы для разных гелиогеомагнитных условий с учетом магнитосферных потоков тепла. Показано, что для спокойных геомагнитных условий в зимний период в утреннем и вечернем секторах формируются «горячие» зоны повышенной температуры электронов, а для возмущенных — кольцеобразная «горячая» область в интервале 04–06 часов мирового времени в результате притока тепла из магнитосферы вдоль силовых линий геомагнитного поля. Анализ данных, полученных с помощью спутника DE-2, показывает возможность формирования такой зоны в период геомагнитных возмущений.

We present results of modeling of the electron temperature distribution in the F region of the subauroral ionosphere for different helio-geomagnetic conditions with consideration for magnetospheric heat fluxes. It is shown that under quiet geomagnetic condi-tions during a winter period in the dawn and dusk sec-tors “hot” zones with a higher electron temperature are formed, and under disturbed geomagnetic conditions an annular “hot” region is formed in a time interval 04–06 UT as a result of heat inflow from Earth’s magnetosphere along magnetic field lines. The analysis of the DE-2 satellite data demonstrates that such zones can be formed during geomagnetic disturbances.

 субавроральная ионосфера электронная температура поток тепла трехмерная модель кольцевой ток область F2 зоны повышенной температуры электронов долготные особенности subauroral ionosphere electron temperature heat flux three-dimensional model ring current F2 region elevated electron temperature regions longitudinal features

INTRODUCTIONIn [Koffman, 1984], the effects of electron temperature elevation in the subauroral ionosphere, i.e. “hot spots” (Te≥5000 K), were revealed by experimental data. Numerical simulation of the thermal regime of the high-latitude ionosphere based on Lagrange approach has been discussed in a number of works [Schunk et al., 1986; Klimenko et al., 1991; Mingalev et al., 2002], which analyzed, in particular, the reasons for the formation of hot spots.In this work, the effect of magnetospheric heat fluxes is studied based on the Euler approach with consideration for the displacement of poles in the electron temperature distribution in the F2 region of the high-latitude ionosphere during a winter period. We use a three-dimensional model of the high-latitude ionosphere (HLI) in Euler variables in terms of its thermal regime [Golikov et al., 2012; Gololobov et al., 2014]. The displacement of geomagnetic and geographic poles, which causes the longitudinal effect in electron density distribution, is taken into account [Kolesnic et al., 1983]. Here, we present the results of space-time distribution of the electron temperature in the F2 region for 05 and 17 UT when the Eastern and Western hemispheres were on the illuminated side. Calculations have been made for winter solstice conditions, solar minimum (F10.7=70), and moderate geomagnetic activity (Kp=3).

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