Numerical Simulations of Impulsively Generated Magnetosonic Waves in a Coronal Loop

Details Numerical Simulations of Impulsively Generated Magnetosonic Waves in a Coronal Loop Numerical Simulations of Impulsively Generated Magnetosonic Waves in a Coronal Loop

Jul 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006soph..236..273o&link_type=abstract

Soar Physics, vol. 236, Issue 2, p.273-283

Physics

3

Scientific paper

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).

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