EGU21-7632
https://doi.org/10.5194/egusphere-egu21-7632
EGU General Assembly 2021
© Author(s) 2021. This work is distributed under
the Creative Commons Attribution 4.0 License.

The asymmetric geospace response to rapid changes in solar wind pressure

Michael Madelaire1, Karl Laundal1, Jone Reistad1, Spencer Hatch1, Anders Ohma1, Stein Haaland1,2, and Reham Elhawary1
Michael Madelaire et al.
  • 1Birkeland Centre for Space Science, Department of Physics and Technology, University of Bergen
  • 2Max Planck Institute for Solar System Research

The geospace response to rapid changes in solar wind pressure results in a perturbation of the magnetospheric-ionospheric system. Ground magnetometer stations located at polar latitudes have long been known to measure a sudden impulse only minutes after a solar wind structure reaches the magnetopause.
Here a list of events associated with a step-like feature in the solar wind dynamic pressure between 1994 and 2020 is compiled based on in situ observations from ACE and Wind. Arrival time estimates are calculated using a simple propagation method and validated with a correlation analysis using SYM-H from low/mid latitude stations. A superposed epoch analysis is carried out to investigate the impact of season, interplanetary magnetic field orientation and other attributes pertaining to the interplanetary shock. All available ground magnetometer stations in SuperMAG, during each event, are used allowing for global coverage. 
Global data coverage is important for this kind of comparative analysis as it is needed to determine changes in the systems response due to e.g. season, which might lead to an improved understanding of the magnetospheric-ionospheric-thermospheric coupling.

How to cite: Madelaire, M., Laundal, K., Reistad, J., Hatch, S., Ohma, A., Haaland, S., and Elhawary, R.: The asymmetric geospace response to rapid changes in solar wind pressure, EGU General Assembly 2021, online, 19–30 Apr 2021, EGU21-7632, https://doi.org/10.5194/egusphere-egu21-7632, 2021.

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