منابع مشابه
An MHD model for solar coronal plumes
Solar coronal plumes are modelled by solving the steady, ideal, 2-D, magnetohydrodynamic (MHD) equations and assuming azimuthal symmetry around the plume axis. Since magnetic fields are believed to play an essential role in plume formation and structure, a self-consistent method of linearisation of the MHD equations with respect to the magnetic field has been considered here. This consists of t...
متن کاملEvolution of Coronal MHD Shocks into Interplanetary MHD Shocks
One of the fimdamental potential hazards to the “Fire” mission (Solar Probe) is the energetic particle environment near the sun. Heras et al., (1995), Sanahuja el al. (1995), and Sanahuja and Lario (1995) have modeled shock acceleration of low energy particles (< 2 MeV) due to fast ejects from the sun, One c@ical problem in this model, at the present time, is that no one has modeled coronal and...
متن کاملMHD Sausage Mode Oscillations in Coronal Loops
A recent study by Nakariakov et al. pointed out that the dispersion relation of MHD sausage mode oscillations has been incorrectly applied to coronal loops, neglecting the highly dispersive nature of the phase speed and the long-wavelength cutoff of the wave number. In the light of these new insights we revisit previous observations that have been interpreted in terms of MHD sausage mode oscill...
متن کاملMhd versus Kinetic Effects in the Solar Coronal Heating: a Two Stage Mechanism
Using Particle-In-Cell simulations i.e. in the kinetic plasma description the discovery of a new mechanism of parallel electric field generation was recently reported. Here we show that the electric field generation parallel to the uniform unperturbed magnetic field can be obtained in a much simpler framework using the ideal magnetohydrodynamics (MHD) description. In ideal MHD the electric fiel...
متن کاملFast MHD waves in a solar coronal arcade
Aims. To investigate detailed properties of fast MHD modes of a three-dimensional waveguide for a cylindrical magnetic arcade. Methods. To derive governing equations and dispersion relations for different density profiles and to numerically solve them to obtain discrete eigenvalues for fast modes and the corresponding eigenfunctions. Results. We find that small changes in the density structure ...
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ژورنال
عنوان ژورنال: Journal of Geophysical Research: Space Physics
سال: 1999
ISSN: 0148-0227
DOI: 10.1029/1998ja900086