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- W4385348093 abstract "Abstract To first order, the magnetopause (MP) is defined by a pressure balance between the solar wind and the magnetosphere. The boundary moves under the influence of varying solar wind conditions and transient foreshock phenomena, reaching unusually large and small distances from the Earth. We investigate under which solar wind conditions such extreme MP distortions occur. Therefore, we construct a database of magnetopause crossings (MPCs) observed by the THEMIS spacecraft in the years 2007 to mid‐2022 using a simple Random Forest Classifier. Roughly 7% of the found crossing events deviate beyond reported errors in the stand‐off distance from the Shue et al. (1998, https://doi.org/10.1029/98JA01103 ) MP model and thus are termed extreme distortions. We find the occurrence of these extreme events in terms of expansion or compression of the MP to be linked to different solar wind parameters, most notably to the IMF magnitude, cone angle, velocity, Alfvén Mach number and temperature. Foreshock transients like hot‐flow anomalies and foreshock bubbles could be responsible for extreme magnetospheric expansions. The results should be incorporated into future magnetopause models and may be helpful for the reconstruction of the MP locations out of soft x‐ray images, relevant for the upcoming SMILE mission." @default.
- W4385348093 created "2023-07-29" @default.
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- W4385348093 date "2023-08-01" @default.
- W4385348093 modified "2023-10-17" @default.
- W4385348093 title "Study of Extreme Magnetopause Distortions Under Varying Solar Wind Conditions" @default.
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- W4385348093 doi "https://doi.org/10.1029/2023ja031603" @default.
- W4385348093 hasPublicationYear "2023" @default.
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