Statistical analysis of whistler precursors upstream of foreshock transient shocks: MMS observationsShandong Provincial Key Laboratory of Optical Astronomy and Solar-Terrestrial Environment, Institute of Space Sciences, Shandong University, Weihai, China.
Shandong Provincial Key Laboratory of Optical Astronomy and Solar-Terrestrial Environment, Institute of Space Sciences, Shandong University, Weihai, China.
Shandong Provincial Key Laboratory of Optical Astronomy and Solar-Terrestrial Environment, Institute of Space Sciences, Shandong University, Weihai, China.
Space Sciences Laboratory, University of California, Berkeley, CA, Berkeley, United States.
Center for Space Physics, Boston University, MA, Boston, United States.
Department of Earth and Space Sciences, Southern University of Science and Technology, Shenzhen, China; LESIA, Observatoire de Paris, CNRS, Université PSL, Sorbonne Université, Université Paris Cité, CNRS, Meudon, France.
Shandong Provincial Key Laboratory of Optical Astronomy and Solar-Terrestrial Environment, Institute of Space Sciences, Shandong University, Weihai, China.
Department of Earth and Space Sciences, Southern University of Science and Technology, Shenzhen, China.
Shandong Provincial Key Laboratory of Optical Astronomy and Solar-Terrestrial Environment, Institute of Space Sciences, Shandong University, Weihai, China; School of Mathematics and Statistics, Shandong University, Weihai, China.
Department of Earth Sciences, The University of Hong Kong, Hong Kong.
State Key Laboratory of Space Weather, National Space Science Center, Chinese Academy of Sciences, Beijing, China.
Department of Earth and Space Sciences, Southern University of Science and Technology, Shenzhen, China.
Shandong Provincial Key Laboratory of Optical Astronomy and Solar-Terrestrial Environment, Institute of Space Sciences, Shandong University, Weihai, China.
Department of Physics, University of Alberta, AB, Edmonton, Canada.
Department of Earth and Space Sciences, Southern University of Science and Technology, Shenzhen, China.
Shandong Provincial Key Laboratory of Optical Astronomy and Solar-Terrestrial Environment, Institute of Space Sciences, Shandong University, Weihai, China.
Department of Earth and Space Sciences, Southern University of Science and Technology, Shenzhen, China.
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2024 (English)In: Geophysical Research Letters, ISSN 0094-8276, E-ISSN 1944-8007, Vol. 51, no 8, article id e2023GL105617Article in journal (Refereed) Published
Abstract [en]
Using the high-time-resolution data from the Magnetospheric Multiscale mission, precursor waves upstream of foreshock transient (FT) shocks are statistically investigated using the four-spacecraft timing method. The wave frequencies and wave vectors determined in the plasma rest frame (PRF) are shown to follow the cold plasma dispersion relation for whistler waves. Combining with the feature of the right-hand polarization in the PRF, the precursors are identified as whistler-mode waves around the lower hybrid frequency. The occurrence of whistler precursors is independent of the Alfvén Mach number and the FT shock normal angle. More importantly, all the whistler precursors have group velocities pointing upstream in the shock frame, suggesting the dispersive radiation to be a possible generation mechanism. The study improves the understanding of not only the whistler precursors but also the overall FT shock dynamics.
Place, publisher, year, edition, pages
American Geophysical Union (AGU), 2024. Vol. 51, no 8, article id e2023GL105617
National Category
Astronomy, Astrophysics and Cosmology Fusion, Plasma and Space Physics
Identifiers
URN: urn:nbn:se:umu:diva-224079DOI: 10.1029/2023GL105617ISI: 001206327700001Scopus ID: 2-s2.0-85191083510OAI: oai:DiVA.org:umu-224079DiVA, id: diva2:1858358
2024-05-162024-05-162024-05-16Bibliographically approved