MHD waves generated by high-frequency photospheric vortex motions
نویسندگان
چکیده
منابع مشابه
The triggering of MHD instabilities through photospheric footpoint motions
The results of 3D numerical simulations modelling the twisting of a coronal loop due to photospheric vortex motions are presented. The simulations are carried out using an initial purely axial field and an initial equilibrium configuration with twist, Φ = LBθ/rBz < Φcrit. The non-linear and resistive evolutions of the instability are followed. The magnetic field is twisted by the boundary motio...
متن کاملProper orthogonal decomposition of solar photospheric motions.
The spatiotemporal dynamics of the solar photosphere is studied by performing a proper orthogonal decomposition (POD) of line of sight velocity fields computed from high resolution data coming from the MDI/SOHO instrument. Using this technique, we are able to identify and characterize the different dynamical regimes acting in the system. Low-frequency oscillations, with frequencies in the range...
متن کاملNonlinear frequency combs generated by cnoidal waves in microring resonators
Cnoidal waves are the periodic analog of solitons. Like solitons, they can be generated in microresonators and correspond to frequency combs. The generation of frequency combs in nonlinear microresonators is modeled by the Lugiato–Lefever equation. In this paper, we study the Lugiato–Lefever equation for a microresonator in the anomalous dispersion regime. In the lossless case, we show that the...
متن کاملFabrication of High Frequency Electromagnetic Waves Absorber Sheets by Use of Iron Oxide Nanostructures
Background & Objective: The necessity of using wireless communications and the use of electromagnetic waves in today's world is obvious to everyone. Using of these equipment and development of them, although have many benefits but causes some anxiety on the way in which they influence on environment. One of the most effective ways of decreasing the unwanted effects of these waves is using of t...
متن کاملcyclic surfaces in e51 generated by homothetic motions
in this paper, we study cyclic surfaces in 5 1 e generated by homothetic motions of a lorentziancircle. the properties of these cyclic surfaces up to first order are investigated. we show that, as it is shown ine5 , cyclic 2-surfaces in 5 1 e , in general, are contained in canal hypersurfaces. finally, we give an example.
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Annales Geophysicae
سال: 2011
ISSN: 1432-0576
DOI: 10.5194/angeo-29-1029-2011