Москва, Россия
Институт физики Земли им. О.Ю. Шмидта РАН
Геофизический Центр РАН
Москва, Россия
Миннеаполис, США
Иркутск, Россия
Пространственное распределение волновой активности диапазона Pс5 во время магнитных бурь сопоставляется с положением границ аврорального овала. Полярная и экваториальная границы аврорального овала определялись по данным УФ-наблюдений на спутнике IMAGE из базы данных Британской Антарктической Службы или по модели OVATION, где использовались данные спутников DMSP. Показано, что в начальную фазу бури основной пик спектральной мощности широкополосных Рс5-колебаний отображается внутрь аврорального овала. Во время восстановительной фазы, максимум спектральной мощности узкополосных Рс5-волн в утреннем и вечернем секторах находился внутри аврорального овала или вблизи его экваториальной границы. Этот экспериментальный результат подтверждает ранее обнаруженные эффекты: пространственно-временные вариации мощности Pс5-волн в утреннем/дополуденном секторе тесно связаны с динамикой аврорального электроджета и магнитосферных продольных токов. При этом квази-монохроматические Pс5-волны демонстрируют типичные резонансные особенности в широтной структуре амплитуды и фазы. Таким образом, положение аврорального овала или его экваториальной границы является предпочтительной широтой для возбуждения магнитосферного альвеновского резонатора. Этот эффект не учитывается современными теориями Рс5-волн, но он может быть значимым для построения более адекватных моделей.
Магнитные бури, Рс5 пульсации, авроральный овал
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