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Mirror modes in the Earth's magnetosheath: Results from a global hybrid-Vlasov simulation
Tekijät: Hoilijoki S, Palmroth M, Walsh BM, Pfau-Kempf Y, von Alfthan S, Ganse U, Hannuksela O, Vainio R
Kustantaja: AMER GEOPHYSICAL UNION
Julkaisuvuosi: 2016
Journal: Journal of Geophysical Research: Space Physics
Tietokannassa oleva lehden nimi: JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS
Lehden akronyymi: J GEOPHYS RES-SPACE
Vuosikerta: 121
Numero: 5
Aloitussivu: 4191
Lopetussivu: 4204
Sivujen määrä: 14
ISSN: 2169-9380
eISSN: 2169-9402
DOI: https://doi.org/10.1002/2015JA022026
Tiivistelmä
We investigate mirror mode structures in the Earth's magnetosheath using our global kinetic Vlasiator simulation, which models ion behavior through their distribution function and treats electrons as a charge-neutralizing fluid. We follow the evolution of waves as they advect along velocity streamlines through the magnetosheath. We find that mirror mode waves are observed preferentially in the quasi-perpendicular magnetosheath along velocity streamlines that enter the sheath in the vicinity of the foreshock ULF wave boundary where there are enough initial perturbations in the plasma for the mirror modes to grow, and the plasma properties fulfill the mirror instability condition better than elsewhere in the magnetosheath. We test selection criteria defined by previous studies and show that the spatial extent over which mirror modes occur ranges from much of the magnetosheath on the quasi-perpendicular side of the subsolar point to very small isolated regions depending on the criteria.
We investigate mirror mode structures in the Earth's magnetosheath using our global kinetic Vlasiator simulation, which models ion behavior through their distribution function and treats electrons as a charge-neutralizing fluid. We follow the evolution of waves as they advect along velocity streamlines through the magnetosheath. We find that mirror mode waves are observed preferentially in the quasi-perpendicular magnetosheath along velocity streamlines that enter the sheath in the vicinity of the foreshock ULF wave boundary where there are enough initial perturbations in the plasma for the mirror modes to grow, and the plasma properties fulfill the mirror instability condition better than elsewhere in the magnetosheath. We test selection criteria defined by previous studies and show that the spatial extent over which mirror modes occur ranges from much of the magnetosheath on the quasi-perpendicular side of the subsolar point to very small isolated regions depending on the criteria.
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