Geometric properties of acoustic waves generated by a point source in solar-like interior: effects of acoustic cut-off frequency
arXiv:1303.2191 · doi:10.1093/mnras/stt420
Abstract
Acoustic waves generated by a point source in stratified plasma are considered in this paper. Analytical parametric solution for monochromatic source is derived for plane-parallel polytrope model of the solar interior. The solution is used to gain insight into the properties of the generated wavefront as a function of excitation frequency and depth. A slowly varying pressure perturbation moving in upper layers of solar photosphere with supersonic speed is also considered. It is shown to excite acoustic waves putting certain restrictions upon their geometry of the generated wavefront. The results are discussed in relation to flare generated sunquakes.
15 pages, 7 figures, accepted by MNRAS
References in corpus (14)
- Acoustic tomography of solar convective flows and structures
- Modeling the Subsurface Structure of Sunspots
- On the origin of 3 seismic sources in the proton-rich flare of October 28, 2003
- Properties of Flares-Generated Seismic Waves on the Sun
- Vortices in simulations of solar surface convection
- February 15, 2011: sun-quakes produced by flux rope eruption
- Excitation of acoustic waves by vortices in the quiet Sun
- An Elementary Introduction to the JWKB Approximation
- Helioseismic response to X2.2 solar flare of February 15, 2011
- Acoustic wave propagation in the solar sub-photosphere with localised magnetic field concentration: effect of magnetic tension
- Helioseismic analysis of the solar flare-induced sunquake of 2005 January 15
- The Cause of Photospheric and Helioseismic Responses to Solar Flares: High-Energy Electrons or Protons?
- Comparison of seismic signatures of flares obtained by SOHO/MDI and GONG instruments
- Green's functions for far-side seismic images: a polar expansion approach