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Transmission of an ICME Sheath Into the Earth's Magnetosheath and the Occurrence of Traveling Foreshocks
Univ Helsinki, Dept Phys, Helsinki, Finland..
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Swedish Institute of Space Physics, Uppsala Division.ORCID iD: 0000-0003-1589-6711
Univ Michigan, Dept Climate & Space Sci & Engn, Ann Arbor, MI 48109 USA.;Aalto Univ, Dept Elect & Nanoengn Engn, Espoo, Finland..
Univ Helsinki, Dept Phys, Helsinki, Finland..
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2021 (English)In: Journal of Geophysical Research - Space Physics, ISSN 2169-9380, E-ISSN 2169-9402, Vol. 126, no 12, article id e2021JA029896Article in journal (Refereed) Published
Abstract [en]

The transmission of a sheath region driven by an interplanetary coronal mass ejection into the Earth's magnetosheath is studied by investigating in situ magnetic field measurements upstream and downstream of the bow shock during an ICME sheath passage on 15 May 2005. We observe three distinct intervals in the immediate upstream region that included a southward magnetic field component and are traveling foreshocks. These traveling foreshocks were observed in the quasi-parallel bow shock that hosted backstreaming ions and magnetic fluctuations at ultralow frequencies. The intervals constituting traveling foreshocks in the upstream survive transmission to the Earth's magnetosheath, where their magnetic field, and particularly the southward component, was significantly amplified. Our results further suggest that the magnetic field fluctuations embedded in an ICME sheath may survive the transmission if their frequency is below ∼0.01 Hz. Although one of the identified intervals was coherent, extending across the ICME sheath and being long-lived, predicting ICME sheath magnetic fields that may transmit to the Earth's magnetosheath from the upstream at L1 observations has ambiguity. This can result from the strong spatial variability of the ICME sheath fields in the longitudinal direction, or alternatively from the ICME sheath fields developing substantially within the short time it takes the plasma to propagate from L1 to the bow shock. This study demonstrates the complex interplay ICME sheaths have with the Earth's magnetosphere when passing by the planet.

Place, publisher, year, edition, pages
American Geophysical Union (AGU) American Geophysical Union (AGU), 2021. Vol. 126, no 12, article id e2021JA029896
National Category
Fusion, Plasma and Space Physics
Identifiers
URN: urn:nbn:se:uu:diva-464449DOI: 10.1029/2021JA029896ISI: 000735715600027OAI: oai:DiVA.org:uu-464449DiVA, id: diva2:1628890
Funder
EU, Horizon 2020, 724391Swedish National Space Board, 2020-00111Academy of Finland, 312390Academy of Finland, 310445Academy of Finland, 310444Swedish Civil Contingencies Agency, 2016-2021Swedish National Space Board, 86/20Academy of Finland, 322544Available from: 2022-01-17 Created: 2022-01-17 Last updated: 2024-01-15Bibliographically approved

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Dimmock, Andrew P.Yordanova, Emiliya

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