Подавление поверхностных мод на дневной магнитопаузе
Автор: Пилипенко В.А., Козырева О.В., Бэддели Л., Лорентцен Д.А., Белаховский В.Б.
Журнал: Солнечно-земная физика @solnechno-zemnaya-fizika
Статья в выпуске: 4 т.3, 2017 года.
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В геофизической литературе активно обсуждается гипотеза о том, что поверхностные волны на магнитопаузе могли бы быть источником дневных широкополосных пульсаций диапазона Pc5-6 (~1-2 мГц) на околокасповых широтах. Однако первые попытки найти наземный отклик на эти колебания не дали обнадеживающих результатов. Так, сопоставление дневной границы открытых и замкнутых силовых линий (т. н. OCB - Open-Closed field line Boundary) по данным радара SuperDARN с пространственной структурой Pc5-6 пульсаций, зарегистрированных на сети магнитометров на околокасповых широтах, показало, что спектральная мощность этих пульсаций имеет максимум преимущественно на 2-3° более внутренних оболочках магнитосферы, чем положение OCB. Дополнительно связь между OCB и геомагнитными пульсациями исследована путем сопоставления профиля мощности дневных пульсаций с экваториальной границей аврорального овала, определяемой по красной кислородной эмиссии по данным сканирующего фотометра на Свалбарде. В большинстве проанализированных событий «эпицентр» мощности Pc5-6 пульсаций оказался примерно на 1-2° более низкой широте, чем OCB, определенной по оптическим данным...
Унч-волны, магнитопауза, граница замкнутых и разомкнутых силовых линий, поверхностные мгд-моды, альвеновский резонатор
Короткий адрес: https://sciup.org/142216918
IDR: 142216918 | DOI: 10.12737/szf-34201702
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