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Direct propagation of photospheric acoustic p-modes into non-magnetic solar atmosphere View all abstracts by submitter

Chris Malins   Submitted: 2007-02-27 05:26

One of the dominant types of coherent signals in Doppler velocity in the solar photosphere are p-modes with periods with a power peak of about 300 seconds. The propagation (or leakage) of these p-mode signals into the higher solar atmosphere is one of the key drivers of oscillatory motions in the higher solar chromosphere and corona. This paper examines numerically the direct propagation of acoustic waves driven harmonically at the photosphere, into the non-magnetic solar atmosphere. Erdelyi et al (2007) investigated the acoustic response to a single point source driver. In this follow-up work we generalise this previous study to more structured coherent photospheric drivers mimicking solar global oscillations. Driving with a pair of point drivers separated in space, reflection at the transition region causes cavity oscillations in the lower chromosphere, and amplification and resonance of waves at the transition region generate strong surface oscillations. Driving at the photosphere with a horizontally widely coherent velocity signal it is demonstrated again thst cavity modes are caused in the chromosphere, surface waves at the transition region, and even in the absence of a magnetic field it is shown that fine-structures are generated extending from a dynamic transition region into the lower corona.

Authors: C. Malins, R. Erdelyi

Publication Status: Accepted
Last Modified: 2007-08-16 10:10
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