TY - JOUR
T1 - Geospace Concussion
T2 - Global Reversal of Ionospheric Vertical Plasma Drift in Response to a Sudden Commencement
AU - Shi, Xueling
AU - Lin, Dong
AU - Wang, Wenbin
AU - Baker, Joseph B.H.
AU - Weygand, James M.
AU - Hartinger, Michael D.
AU - Merkin, Viacheslav G.
AU - Ruohoniemi, J. Michael
AU - Pham, Kevin
AU - Wu, Haonan
AU - Angelopoulos, Vassilis
AU - McWilliams, Kathryn A.
AU - Nishitani, Nozomu
AU - Shepherd, Simon G.
N1 - Publisher Copyright:
© 2022. The Authors.
PY - 2022/10/16
Y1 - 2022/10/16
N2 - 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 (Formula presented.) vertical drift is caused by a global reversal of ionospheric zonal electric field induced by magnetospheric compression during the SC.
AB - 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 (Formula presented.) vertical drift is caused by a global reversal of ionospheric zonal electric field induced by magnetospheric compression during the SC.
KW - SuperDARN
KW - geomagnetic storm
KW - ionospheric vertical drift
KW - sudden commencement
UR - https://www.scopus.com/pages/publications/85139558930
U2 - 10.1029/2022GL100014
DO - 10.1029/2022GL100014
M3 - Article
AN - SCOPUS:85139558930
SN - 0094-8276
VL - 49
JO - Geophysical Research Letters
JF - Geophysical Research Letters
IS - 19
M1 - e2022GL100014
ER -