Solar-Terrestrial Physics Solar-Terrestrial Physics Солнечно-земная физика / Solnechno-Zemnaya Fizika / Solar-Terrestrial Physics 2712-9640 21934 10.12737/szf-52201913 Результаты исследований Results of current research Результаты исследований Diagnostics of auroral oval boundaries on the basis of the magnetogram inversion technique Диагностика границ аврорального овала на основе техники инверсии магнитограмм Лунюшкин Сергей Брониславович Lunyushkin Sergey Bronislavovich lunyushkin@iszf.irk.ru Пенских Юрий Владимирович Penskikh Yury Vladimirovich penskikh@iszf.irk.ru Институт солнечно-земной физики СО РАН Иркутск Россия Institute of Solar Terrestrial Physics SB RAS Irkutsk Russian Federation Институт солнечно-земной физики СО РАН Иркутск Россия Institute of Solar Terrestrial Physics SB RAS Irkutsk Russian Federation 5 2 97 113 https://zh-szf.ru/en/nauka/article/21934/view

Показано, что граница обращения ионосферной конвекции является фундаментальным параметром магнитосферно-ионосферной связи, определяющим сильную аналогию между электростатическим потенциалом ионосферы и эквивалентной токовой функцией в приближении дипольного геомагнитного поля и однородной проводимости ионосферы. Разработан новый наземный метод автоматической диагностики границ аврорального овала по выходным данным техники инверсии магнитограмм (ТИМ). На основе карт распределений токовой функции и продольных токов, рассчитанных на первом этапе ТИМ при однородной проводимости ионосферы, определяются граница обращения ионосферной конвекции, граница полярной шапки, экваториальная граница аврорального овала и линия максимумов плотности авроральных электроструй. Указанные параметры ранее определялись визуально-ручным методом: анализом карт продольных и эквивалентных токов на экране монитора и проведением заданных границ с помощью мыши, что занимало очень много времени (недели и месяцы). Сравнение границ, полученных старым ручным и новым автоматическим методами, показало, что коэффициент корреляции между двумя границами составляет в среднем 0.85, а среднеквадратичное отклонение не превышает 2° по широте. Обеспечивая достаточную точность определения границ, автоматический метод сокращает время обработки необходимых объемов данных на два-три порядка (до минут и часов), освобождая исследователя от трудоемкой визуальной работы. Новый метод реализован как один из важных блоков модернизированного комплекса программ ТИМ.

It is shown that the convection reversal boundary is a fundamental parameter of the magnetosphere-ionosphere coupling, which determines a strong analogy between the electrostatic potential of the ionosphere and the equivalent current function in the dipole geomagnetic field approximation and the uniform ionospheric conductance. We have developed a new ground-based method for automatically diagnosing boundaries of the auroral oval using output data obtained with the magnetogram inversion technique (MIT). Using maps of the current function and field-aligned currents, calculated at the first stage of MIT with uniform ionospheric conductance, we determine the convection reversal boundary, polar cap boundary, equatorial boundary of the auroral oval, and line of maximum density of auroral electrojets. These parameters have previously been determined by a visual-manual method: analyzing maps of field-aligned and equivalent currents on the monitor screen and carrying out predetermined boundaries with the mouse — this took a very long time (weeks and months). The comparison between manually and automatically obtained boundaries has shown that the correlation coefficient between the two boundaries is, on average, 0.85, and the root-mean-square deviation does not exceed 2° in latitude. By providing an adequate accuracy for the boundary determination, the automatic method reduces the time for map processing by a factor of 2–3 (to minutes and hours), releasing a researcher from laborious visual work. The new method is implemented as one of the important modules in the updated MIT software.

 ионосферная конвекция эквивалентная токовая функция авроральный овал полярная шапка продольные токи граница обращения конвекции ionospheric convection equivalent current function auroral oval polar cap field-aligned currents convection reversal boundary

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