Геофизический центр РАН
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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