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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.

Translated title of the contributionВековой дрейф авроральных овалов: Как быстро они в действительности смещаются
Original languageEnglish
Pages (from-to)3017-3023
Number of pages7
JournalGeophysical Research Letters
Volume46
Issue number6
DOIs
StatePublished - 28 Mar 2019

    Research areas

  • auroral oval, eccentric dipole, empirical models, IGRF, magnetosphere, secular shift, FIELD

    Scopus subject areas

  • Physics and Astronomy(all)
  • Geophysics
  • Earth and Planetary Sciences(all)

ID: 41340740