Numerical Simulations of Impulsively Generated Magnetosonic Waves in a Coronal Loop |
| |
| Authors: | R Ogrodowczyk K Murawski |
| |
| Institution: | (1) Institute of Mathematics and Computer Science, The State University, Chełm, Poland;(2) Group of Astrophysics and Gravity Theory, Institute of Physics, UMCS, Lublin, Poland |
| |
| Abstract: | We consider impulsively excited magnetosonic waves in a highly magnetized coronal loop that is approximated by a straight
plasma slab of enhanced mass density. Numerical results reveal that wavelet spectra of time signatures of these waves possess
characteristic shapes that depend on the position of the initial pulse: in the case of a pulse launched inside the slab, these
spectra are of a tadpole shape, while for a pulse excited in the ambient medium these spectra display more complex structures
with branches of long and short-period waves. These short period oscillations correspond to waves that are trapped inside
the slab, and the long-period oscillations are associated with waves that propagate through the ambient medium and reach the
detection point. These findings are compatible with recent theoretical studies and observations by the solar eclipse coronal
imaging system (SECIS). |
| |
| Keywords: | |
| 本文献已被 SpringerLink 等数据库收录！ |
|
