Extremely Distant Magnetopause Locations Caused by Magnetosheath Jets

0580522 - ÚFA 2024 RIV US eng J - Journal Article
Němeček, Z. - Šafránková, J. - Grygorov, K. - Mokrý, A. - Pi, G. - Nafchi, M. A. - Němec, F. - Xirogiannopoulou, N. - Šimůnek, Jiří
Extremely Distant Magnetopause Locations Caused by Magnetosheath Jets.
Geophysical Research Letters. Roč. 50, č. 24 (2023), č. článku e2023GL106131. ISSN 0094-8276. E-ISSN 1944-8007
Institutional support: RVO:68378289
Keywords : interplanetary magnetic field * magnetopause * magnetosheath jets * solar wind
OECD category: Fluids and plasma physics (including surface physics)
Impact factor: 5.2, year: 2022
Method of publishing: Open access
https://agupubs.onlinelibrary.wiley.com/doi/10.1029/2023GL106131

Magnetopause position is controlled mainly by the solar wind dynamic pressure and north-south interplanetary magnetic field component and these quantities are included in different empirical magnetopause models. We have collected about 50,000 of dayside magnetopause crossings observed by THEMIS in course of 2007–2019 and compared the observed magnetopause position with model prediction. The difference between observed and predicted magnetopause radial distance, Robs − Rmod is used for quantifying the model-observation agreement. Its median values are well predicted for cases up to Robs ≈ 12 RE for all models but higher positive deviations are found for larger magnetopause distances, mainly under a nearly radial field and low dynamic pressure. The analysis reveals their connection with transient magnetopause displacements caused by strong sunward flows in the magnetosheath. We discuss the possible origin of the observed magnetosheath flow switching in terms of the interaction of magnetosheath jets with the magnetopause.
Permanent Link: https://hdl.handle.net/11104/0349402