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Magnetosheath jet-triggered ULF waves: energy deposition in the ionosphere
Umeå University, Faculty of Science and Technology, Department of Physics.ORCID iD: 0000-0002-1826-3613
Umeå University, Faculty of Science and Technology, Department of Physics.ORCID iD: 0000-0002-2043-4442
Umeå University, Faculty of Science and Technology, Department of Physics.ORCID iD: 0000-0001-5379-1158
Department of Arctic Geophysics, University Centre in Svalbard, Longyearbyen, Norway.
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2025 (English)In: Journal of Geophysical Research - Space Physics, ISSN 2169-9380, E-ISSN 2169-9402, Vol. 130, no 4, article id e2025JA033792Article in journal (Refereed) Published
Abstract [en]

Magnetosheath jets, transient plasma structures of enhanced dynamic pressure, have been observed to trigger ultra-low frequency (ULF) waves in the magnetosphere. These ULF waves contribute to energy transport in the magnetosphere-ionosphere system. Therefore, there is a need to estimate the energy input into the ionosphere due to jet-triggered ULF waves. In this study, we combine measurements from Magnetospheric Multiscale, ground-based magnetometers, the EISCAT radar on Svalbard, and SuperDARN to estimate the Joule heating in the ionosphere resulting from jet impacts at the magnetopause. Focusing on three jets observed on 2016-01-07 we were able to calculate the Joule heating for two jets. We found an average Joule heating rate of (Formula presented.) mW/m2 which is on par with other processes such as field line resonances. However, due to the short duration and spatial confinement of the jet-induced ULF waves, the average energy input was only (Formula presented.) J. This suggests that the energy deposition of jet-triggered ULF waves is small compared to other magnetospheric processes, and thus does not significantly impact the average energy budget of the magnetosphere.

Place, publisher, year, edition, pages
American Geophysical Union (AGU), 2025. Vol. 130, no 4, article id e2025JA033792
Keywords [en]
joule heating, magnetosheath jets, ULF waves
National Category
Fusion, Plasma and Space Physics
Identifiers
URN: urn:nbn:se:umu:diva-239179DOI: 10.1029/2025JA033792ISI: 001469888700001Scopus ID: 2-s2.0-105005413452OAI: oai:DiVA.org:umu-239179DiVA, id: diva2:1968593
Funder
Swedish Research Council, 2018‐03623Swedish National Space Board, 2022‐00138Swedish National Space Board, 2023‐00208The Research Council of Norway, 343302Swedish Research Council, 2021‐06683Available from: 2025-06-13 Created: 2025-06-13 Last updated: 2025-06-13Bibliographically approved

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Krämer, EvaHamrin, MariaGunell, HerbertSchillings, Audrey

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