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ULF Wave Transmissi...
ULF Wave Transmission Across Collisionless Shocks : 2.5D Local Hybrid Simulations
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- Kajdic, P. (författare)
- Univ Nacl Autonoma Mexico, Dept Ciencias Espaciales, Inst Geofis, Ciudad Univ, Ciudad De Mexico, Mexico.
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- Pfau-Kempf, Y. (författare)
- Univ Helsinki, Dept Phys, Helsinki, Finland.
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- Turc, L. (författare)
- Univ Helsinki, Dept Phys, Helsinki, Finland.
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- Dimmock, Andrew P. (författare)
- Uppsala universitet,Institutet för rymdfysik, Uppsalaavdelningen
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- Palmroth, M. (författare)
- Univ Helsinki, Dept Phys, Helsinki, Finland.
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- Takahashi, K. (författare)
- Johns Hopkins Univ, Appl Phys Lab, Laurel, MD USA.
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- Kilpua, E. (författare)
- Univ Helsinki, Dept Phys, Helsinki, Finland.
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- Soucek, J. (författare)
- Acad Sci Czech Republ, Inst Atmospher Phys, Prague, Czech Republic.
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- Takahashi, N. (författare)
- Univ Tokyo, Dept Earth & Planetary Sci, Grad Sch Sci, Tokyo, Japan.
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- Preisser, L. (författare)
- Univ Nacl Autonoma Mexico, Dept Ciencias Espaciales, Inst Geofis, Ciudad Univ, Ciudad De Mexico, Mexico.;Austrian Acad Sci, Space Res Inst, Graz, Austria.
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- Blanco-Cano, X. (författare)
- Univ Nacl Autonoma Mexico, Dept Ciencias Espaciales, Inst Geofis, Ciudad Univ, Ciudad De Mexico, Mexico.
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- Trotta, D. (författare)
- Univ Calabria, Dipartimento Fis, Cosenza, Italy.
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- Burgess, D. (författare)
- Queen Mary Univ London, Sch Phys & Astron, London, England.
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Univ Nacl Autonoma Mexico, Dept Ciencias Espaciales, Inst Geofis, Ciudad Univ, Ciudad De Mexico, Mexico Univ Helsinki, Dept Phys, Helsinki, Finland. (creator_code:org_t)
- American Geophysical Union (AGU), 2021
- 2021
- Engelska.
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Ingår i: Journal of Geophysical Research - Space Physics. - : American Geophysical Union (AGU). - 2169-9380 .- 2169-9402. ; 126:11
- Relaterad länk:
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https://urn.kb.se/re...
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https://doi.org/10.1...
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Abstract
Ämnesord
Stäng
- We study the interaction of upstream ultralow frequency (ULF) waves with collisionless shocks by analyzing the outputs of 11 2D local hybrid simulation runs. Our simulated shocks have Alfvenic Mach numbers between 4.29 and 7.42 and their theta BN angles are 15 degrees, 30 degrees, 45 degrees, and 50 degrees. The ULF wave foreshocks develop upstream of all of them. The wavelength and the amplitude of the upstream waves exhibit a complex dependence on the shock's MA and theta BN. The wavelength positively correlates with both parameters, with the dependence on theta BN being much stronger. The amplitude of the ULF waves is proportional to the product of the reflected beam velocity and density, which also depend on MA and theta BN. The interaction of the ULF waves with the shock causes large-scale (several tens of upstream ion inertial lengths) shock rippling. The properties of the shock ripples are related to the ULF wave properties, namely their wavelength and amplitude. In turn, the ripples have a large impact on the ULF wave transmission across the shock because they change local shock properties (theta BN, strength), so that different sections of the same ULF wavefront encounter shock with different characteristics. Downstream fluctuations do not resemble the upstream waves in terms the wavefront extension, orientation or their wavelength. However, some features are conserved in the Fourier spectra of downstream compressive waves that present a bump or flattening at wavelengths approximately corresponding to those of the upstream ULF waves. In the transverse downstream spectra, these features are weaker.
Ämnesord
- NATURVETENSKAP -- Fysik -- Fusion, plasma och rymdfysik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Fusion, Plasma and Space Physics (hsv//eng)
- NATURVETENSKAP -- Fysik -- Astronomi, astrofysik och kosmologi (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Astronomy, Astrophysics and Cosmology (hsv//eng)
Nyckelord
- foreshock
- magnetosheath
- turbulence
- ULF waves
- wave transmission
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- ref (ämneskategori)
- art (ämneskategori)
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- Av författaren/redakt...
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Kajdic, P.
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Pfau-Kempf, Y.
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Turc, L.
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Dimmock, Andrew ...
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Palmroth, M.
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Takahashi, K.
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visa fler...
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Kilpua, E.
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Soucek, J.
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Takahashi, N.
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Preisser, L.
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Blanco-Cano, X.
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Trotta, D.
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Burgess, D.
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visa färre...
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