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Effect of IMF B-y on the Entry of Solar Wind Ions Into the Near-Earth Tail Lobe: Global Hybrid Simulation and MMS Observation

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dc.creatorWang, Chih-Ping
dc.creatorXing, Xiaoyan
dc.creatorWang, Xueyi
dc.creatorAvanov, Levon
dc.creatorLin, Yu
dc.creatorStrangeway, Robert
dc.creatorWei, H
dc.description.abstractGlobal simulations predict that the low-latitude mantle may be an important pathway for the solar wind entry into the tail magnetosphere close to the current sheet when interplanetary magnetic field (IMF) B-y dominates over IMF B-z. To evaluate this entry mechanism in the near-Earth tail (X similar to -10--20 R-E), we investigate the predictions from 3D global hybrid simulations as well as in situ observations by magnetospheric multiscale (MMS) spacecraft. The simulations predict that the low-latitude mantle plasma can appear in the near-Earth tail lobe extending inward approximately 5 R-E from the flank magnetopause. The low-latitude mantle plasma appears in the dawnside northern lobe and duskside southern lobe during positive IMF B-y, while the opposite asymmetry is seen during negative IMF B-y. After a change in the IMF B-y direction arriving at the bow shock nose, it takes another similar to 15-30 min for the asymmetry to completely reverse to the opposite sense in the near-Earth tail. We present six MMS events in the tail lobe showing that the existence and absence of the low-latitude mantle plasma is consistent with the predicted asymmetries. Statistical analysis of 5 years of MMS observations shows that the dependencies of the magnitudes of the lobe densities and tailward field-aligned flow speeds on the IMF B-y directions are consistent with the predicted contributions from the low-latitude mantle plasma in the expected lobe regions.en_US
dc.publisherAmerican Geophysical Unionen_US
dc.rights©American Geophysical Union 2022. This is this the version of record co-published by the American Geophysical Union and John Wiley & Sons, Inc. It is made available under the CC-BY-NC-ND 4.0 license. Item should be cited as: Wang, C. P., Xing, X., Wang, X., Avanov, L. A., Lin, Y., Strangeway, R. J., & Wei, H. Y. (2022). Effect of IMF By on the Entry of Solar Wind Ions Into the Near‐Earth Tail Lobe: Global Hybrid Simulation and MMS Observation. Journal of Geophysical Research: Space Physics, 127(9), e2022JA030800.en_US
dc.titleEffect of IMF B-y on the Entry of Solar Wind Ions Into the Near-Earth Tail Lobe: Global Hybrid Simulation and MMS Observationen_US
dc.type.genreJournal Article, Academic Journalen_US

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