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A surprisingly fast secular drift of the Northern geomagnetic dip pole during the last two decades has attracted much interest lately, in particular, evoking speculations about a possibility of a sweeping relocation of the auroral oval. This letter presents first results of a model investigation of this issue, based on an empirical representation of the distant magnetosphere combined with a series of internal geomagnetic field models for 12 epochs, covering the interval from 1965 to 2020. The secular drift of the northern auroral oval was found to result in its net displacement over the 55-year period, commensurate with the concurrent shifts of the centered, eccentric, and corrected geomagnetic poles, all of them much smaller than the enormous spurt of the northern dip pole. In the Southern Hemisphere, the shift of the auroral oval and of the poles over the same period is much weaker, revealing a remarkable interhemispheric asymmetry.

Переведенное названиеВековой дрейф авроральных овалов: Как быстро они в действительности смещаются
Язык оригиналаанглийский
Страницы (с-по)3017-3023
Число страниц7
ЖурналGeophysical Research Letters
Том46
Номер выпуска6
DOI
СостояниеОпубликовано - 28 мар 2019

    Предметные области Scopus

  • Физика и астрономия (все)
  • Геофизика
  • Планетоведение и науки о земле (все)

ID: 41340740