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X‐ray imaging of Kelvin‐Helmholtz waves at the magnetopause
Author(s) -
Sun T. R.,
Wang C.,
Wei F.,
Sembay S.
Publication year - 2015
Publication title -
journal of geophysical research: space physics
Language(s) - English
Resource type - Journals
eISSN - 2169-9402
pISSN - 2169-9380
DOI - 10.1002/2014ja020497
Subject(s) - magnetopause , physics , intensity (physics) , magnetohydrodynamics , solar wind , magnetohydrodynamic drive , perturbation (astronomy) , computational physics , geophysics , optics , plasma , astronomy , quantum mechanics
This paper simulates the Kelvin‐Helmholtz wave (KHW)‐induced X‐ray emissions at the low‐latitude magnetopause based on a global MHD code. A method is proposed to extract the KHW information from the X‐ray intensity measured by a hypothetical X‐ray telescope onboard a satellite assumed with a low Earth orbit. Specifically, the X‐ray intensity at high latitude is subtracted from the intensity map as a background to highlight the role of KHW. Using this method, global features of KHW such as the vortex velocity, perturbation degree, spatial distribution, and temporal evolution could be evaluated from the X‐ray intensity map. The validity of this method during intervals of solar wind disturbances is also verified. According to the simulation results, X‐ray imaging of KHW is suggested as a promising observation technique to essentially “see” the large‐scale configuration and evolution of KHW for the first time.