Zobrazeno 1 - 10
of 45
pro vyhledávání: '"Paul J Bushby"'
Shear-driven magnetic buoyancy in the solar tachocline: The mean electromotive force due to rotation
The leading theoretical paradigm for the Sun's magnetic cycle is an $\alpha\omega$-dynamo process, in which a combination of differential rotation and turbulent, helical flows produces a large-scale magnetic field that reverses every 11 years. Most $
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::b7ae32fcf051adb77105becccb9f892e
http://arxiv.org/abs/2301.05067
http://arxiv.org/abs/2301.05067
Magnetically-driven hotspot variations (which are tied to atmospheric wind variations) in hot Jupiters are studied using non-linear numerical simulations of a shallow-water magnetohydrodynamic (SWMHD) system and a linear analysis of equatorial SWMHD
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::2e4a7226cace510c4369e8c974f114f4
http://arxiv.org/abs/2107.07515
http://arxiv.org/abs/2107.07515
We use results of shallow-water magnetohydrodynamics (SWMHD) to place estimates on the minimum magnetic field strengths required to cause atmospheric wind variations (and therefore westward venturing hotspots) for a dataset of hot Jupiters (HJs), inc
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::0eea068148bbc2bb281f27183ae01b3f
Publikováno v:
Physical Review Fluids. 5
Dynamo action is studied using numerical simulations of planar Boussinesq convection at rapid rotation, focusing on dynamo action below convective onset. Subcritical dynamo action is successfully sustained in numerous cases, with an extension of the
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::982dacf36fcabc66657a33612e8cc4c4
https://doi.org/10.1103/physrevfluids.5.113702
https://doi.org/10.1103/physrevfluids.5.113702
Publikováno v:
Physical Review Fluids. 5
Exponential amplification of weak seed magnetic fields in a turbulent medium eventually slows and saturates due to back reaction by the Lorentz force. This is known as the fluctuation dynamo action. Using numerical simulations of driven turbulence, w
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::28e5e9205debb36a0ade949c7c5eeec4
https://doi.org/10.1103/physrevfluids.5.043702
https://doi.org/10.1103/physrevfluids.5.043702
Publikováno v:
Monthly Notices of the Royal Astronomical Society. 473:4544-4557
Synchrotron radiation from cosmic rays is a key observational probe of the galactic magnetic field. Interpreting synchrotron emission data requires knowledge of the cosmic ray number density, which is often assumed to be in energy equipartition (or o
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::c208c0bc76ebc6ed4f41252edae041e9
https://doi.org/10.1093/mnras/stx2606
https://doi.org/10.1093/mnras/stx2606
Publikováno v:
Monthly Notices of the Royal Astronomical Society. 464:L105-L109
We explore the effects of the multiphase structure of the interstellar medium (ISM) on galactic magnetic fields. Basing our analysis on compressible magnetohydrodynamic simulations of supernova-driven turbulence in the ISM, we investigate the propert
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::eac972048d10dc551d20b61e496360cd
http://juuli.fi/Record/0280914117
http://juuli.fi/Record/0280914117
We explore the effect of magnetic fields on the vertical distribution and multiphase structure of the supernova-driven interstellar medium (ISM) in simulations that admit dynamo action. As the magnetic field is amplified to become dynamically signifi
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::384a44c7db9363646f2a6f60ebb1ea5e
https://aaltodoc.aalto.fi/handle/123456789/40472
https://aaltodoc.aalto.fi/handle/123456789/40472
Publikováno v:
Astronomy & Astrophysics, 623, 1-20
Astronomy & Astrophysics, 623, pp. 1-20
Astronomy & Astrophysics, 623, pp. 1-20
A convenient representation of the structure of the large-scale galactic magnetic field is required for the interpretation of polarization data in the sub-mm and radio ranges, in both the Milky Way and external galaxies. We develop a simple and flexi
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::f89d7b4397df22578c5f6db1c1a689f5
http://hdl.handle.net/2066/201805
http://hdl.handle.net/2066/201805
Autor:
Paul J. Bushby, Toby S. Wood
Publikováno v:
Journal of Fluid Mechanics. 803:502-515
We determine the asymptotic conditions under which the Boussinesq approximation is valid for oscillatory convection in a rapidly rotating fluid. In the astrophysically relevant parameter regime of small Prandtl number, we show that the Boussinesq pre
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::3c6cf812d0864cecd8100aeffeec00a6
https://doi.org/10.1017/jfm.2016.511
https://doi.org/10.1017/jfm.2016.511