Interhemispheric Asymmetries in the Ground Magnetic Response to Interplanetary Shocks: The Role of Shock Impact Angle

Interplanetary (IP) shocks drive magnetosphere‐ionosphere (MI) current systems that in turn are associated with ground magnetic perturbations. Recent work has shown that IP shock impact angle plays a significant role in controlling the subsequent geomagnetic activity and magnetic perturbations; for...

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Bibliographic Details
Published in:Space Weather
Main Authors: Xu, Z., Hartinger, M. D., Oliveira, D. M., Coyle, S., Clauer, C. R., Weimer, D., Edwards, T. R.
Format: Article in Journal/Newspaper
Language:English
Published: 2020
Subjects:
Antarc*
Antarctic
Greenland
Online Access:https://orbit.dtu.dk/en/publications/e9b85776-4d64-4c39-bf11-c85815f8a648
https://doi.org/10.1029/2019sw002427
https://backend.orbit.dtu.dk/ws/files/208867550/2019SW002427.pdf
Description
Summary:Interplanetary (IP) shocks drive magnetosphere‐ionosphere (MI) current systems that in turn are associated with ground magnetic perturbations. Recent work has shown that IP shock impact angle plays a significant role in controlling the subsequent geomagnetic activity and magnetic perturbations; for example, highly inclined shocks drive asymmetric MI responses due to interhemispherical asymmetric magnetospheric compressions, while almost head‐on shocks drive more symmetric MI responses. However, there are few observations confirming that inclined shocks drive such asymmetries in the high‐latitude ground magnetic response. We use data from a chain of Antarctic magnetometers, combined with magnetically conjugate stations on the west coast of Greenland, to test these model predictions (Oliveira & Raeder, 2015, https://doi-org.proxy.findit.dtu.dk/10.1002/2015JA021147; Oliveira, 2017, https://doi-org.proxy.findit.dtu.dk/10.1007/s13538-016-0472-x).

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