BibTex format
@article{Grimmich:2025:10.5194/angeo-43-151-2025,
author = {Grimmich, N and Pöppelwerth, A and Archer, MO and Sibeck, DG and Plaschke, F and Mo, W and Toy-Edens, V and Turner, DL and Kim, H and Nakamura, R},
doi = {10.5194/angeo-43-151-2025},
journal = {Annales Geophysicae},
pages = {151--173},
title = {Investigation of the occurrence of significant deviations in the magnetopause location: solar-wind and foreshock effects},
url = {http://dx.doi.org/10.5194/angeo-43-151-2025},
volume = {43},
year = {2025}
}
RIS format (EndNote, RefMan)
TY - JOUR
AB - Common magnetopause models can predict the location of the magnetopause with respect to upstream conditions from different sets of input parameters, including solarwind pressure and the interplanetary magnetic field. However, recent studies have shown that some effects of upstream conditions may still be poorly understood since deviations between models and in situ observations beyond the expected scatter due to constant magnetopause motion are quite common. Using data from the three most recent multi-spacecraft missions to near-Earth space (Cluster, THEMIS, and MMS), we investigate the occurrence of these large deviations in observed magnetopause crossings from common empirical models. By comparing the results from different models, we find that the occurrence of these events appears to be model independent, suggesting that some physical processes may be missing from the models. To find these processes, we test whether the deviant magnetopause crossings are statistically associated with foreshocks and/or different solar-wind types and show that, in at least 40% of cases, the foreshock can be responsible for the large deviations in the magnetopause's location. In the case where the foreshock is unlikely to be responsible, two distinct classes of solar wind are found to occur more frequently in association with the occurrence of magnetopause deviations: the "fast"solar wind and the solarwind plasma associated with transients such as interplanetary coronal mass ejections. Therefore, the plasma conditions associated with these solar-wind classes could be responsible for the occurrence of deviant magnetopause observations. Our results may help to develop new and more accurate models of the magnetopause, which will be needed, for example, to accurately interpret the results of the upcoming SolarWind Magnetosphere Ionosphere Link Explorer (SMILE) mission.
AU - Grimmich,N
AU - Pöppelwerth,A
AU - Archer,MO
AU - Sibeck,DG
AU - Plaschke,F
AU - Mo,W
AU - Toy-Edens,V
AU - Turner,DL
AU - Kim,H
AU - Nakamura,R
DO - 10.5194/angeo-43-151-2025
EP - 173
PY - 2025///
SN - 0992-7689
SP - 151
TI - Investigation of the occurrence of significant deviations in the magnetopause location: solar-wind and foreshock effects
T2 - Annales Geophysicae
UR - http://dx.doi.org/10.5194/angeo-43-151-2025
VL - 43
ER -