Login / Signup

Geospace Concussion: Global Reversal of Ionospheric Vertical Plasma Drift in Response to a Sudden Commencement.

Xueling ShiDong LinWenbin WangJoseph B H BakerJames M WeygandMichael D HartingerViacheslav G MerkinJ Michael RuohoniemiKevin PhamHaonan WuVassilis AngelopoulosKathryn A McWilliamsNozomu NishitaniSimon G Shepherd
Published in: Geophysical research letters (2022)
An interplanetary shock can abruptly compress the magnetosphere, excite magnetospheric waves and field-aligned currents, and cause a ground magnetic response known as a sudden commencement (SC). However, the transient (<∼1 min) response of the ionosphere-thermosphere system during an SC has been little studied due to limited temporal resolution in previous investigations. Here, we report observations of a global reversal of ionospheric vertical plasma motion during an SC on 24 October 2011 using ∼6 s resolution Super Dual Auroral Radar Network ground scatter data. The dayside ionosphere suddenly moved downward during the magnetospheric compression due to the SC, lasting for only ∼1 min before moving upward. By contrast, the post-midnight ionosphere briefly moved upward then moved downward during the SC. Simulations with a coupled geospace model suggest that the reversed E ⃗ × B ⃗ vertical drift is caused by a global reversal of ionospheric zonal electric field induced by magnetospheric compression during the SC.
Keyphrases
  • magnetic resonance
  • magnetic resonance imaging
  • electronic health record
  • computed tomography
  • big data
  • machine learning
  • artificial intelligence
  • data analysis