Origin of Dawnside Subauroral Polarization Streams During Major Geomagnetic Storms

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dc.citation.articleNumbere2022AV000708en_US
dc.citation.issueNumber4en_US
dc.citation.journalTitleAGU Advancesen_US
dc.citation.volumeNumber3en_US
dc.contributor.authorLin, Dongen_US
dc.contributor.authorWang, Wenbinen_US
dc.contributor.authorMerkin, Viacheslav G.en_US
dc.contributor.authorHuang, Chaosongen_US
dc.contributor.authorOppenheim, Meersen_US
dc.contributor.authorSorathia, Kareemen_US
dc.contributor.authorPham, Kevinen_US
dc.contributor.authorMichael, Adamen_US
dc.contributor.authorBao, Shanshanen_US
dc.contributor.authorWu, Qianen_US
dc.contributor.authorZhang, Yongliangen_US
dc.contributor.authorWiltberger, Michaelen_US
dc.contributor.authorToffoletto, Franken_US
dc.contributor.authorLyon, Johnen_US
dc.contributor.authorGarretson, Jeffreyen_US
dc.date.accessioned2022-09-29T15:06:25Zen_US
dc.date.available2022-09-29T15:06:25Zen_US
dc.date.issued2022en_US
dc.description.abstractSolar eruptions cause geomagnetic storms in the near-Earth environment, creating spectacular aurorae visible to the human eye and invisible dynamic changes permeating all of geospace. Just equatorward of the aurora, radars and satellites often observe intense westward plasma flows called subauroral polarization streams (SAPS) in the dusk-to-midnight ionosphere. SAPS occur across a narrow latitudinal range and lead to intense frictional heating of the ionospheric plasma and atmospheric neutral gas. SAPS also generate small-scale plasma waves and density irregularities that interfere with radio communications. As opposed to the commonly observed duskside SAPS, intense eastward subauroral plasma flows in the morning sector were recently discovered to have occurred during a super storm on 20 November 2003. However, the origin of these flows termed “dawnside SAPS” could not be explained by the same mechanism that causes SAPS on the duskside and has remained a mystery. Through real-event global geospace simulations, here we demonstrate that dawnside SAPS can only occur during major storm conditions. During these times, the magnetospheric plasma convection is so strong as to effectively transport ions to the dawnside, whereas they are typically deflected to the dusk by the energy-dependent drifts. Ring current pressure then builds up on the dawnside and drives field-aligned currents that connect to the subauroral ionosphere, where eastward SAPS are generated. The origin of dawnside SAPS explicated in this study advances our understanding of how the geospace system responds to strongly disturbed solar wind driving conditions that can have severe detrimental impacts on human society and infrastructure.en_US
dc.identifier.citationLin, Dong, Wang, Wenbin, Merkin, Viacheslav G., et al.. "Origin of Dawnside Subauroral Polarization Streams During Major Geomagnetic Storms." <i>AGU Advances,</i> 3, no. 4 (2022) Wiley: https://doi.org/10.1029/2022AV000708.en_US
dc.identifier.digitalAGUAdvances-2022-Linen_US
dc.identifier.doihttps://doi.org/10.1029/2022AV000708en_US
dc.identifier.urihttps://hdl.handle.net/1911/113428en_US
dc.language.isoengen_US
dc.publisherWileyen_US
dc.rightsThis is an open access article under the terms of the Creative Commons Attribution-NonCommercial License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited and is not used for commercial purposes.en_US
dc.rights.urihttps://creativecommons.org/licenses/by-nc/4.0/en_US
dc.titleOrigin of Dawnside Subauroral Polarization Streams During Major Geomagnetic Stormsen_US
dc.typeJournal articleen_US
dc.type.dcmiTexten_US
dc.type.publicationpublisher versionen_US
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