Sign on

SAO/NASA ADS Astronomy Abstract Service

· Find Similar Abstracts (with default settings below)
· Full Printable Article (PDF/Postscript)
· Also-Read Articles (Reads History)
·
· Translate This Page
Title:
The seismic effects of a sunspot
Authors:
Schunker, H.; Cameron, R.; Gizon, L.
Publication:
12th European Solar Physics Meeting, Freiburg, Germany, held September, 8-12, 2008. Online at http://espm.kis.uni-freiburg.de/, p.3.5
Publication Date:
09/2008
Origin:
ADS
Bibliographic Code:
2008ESPM...12..3.5S

Abstract

We simulate the helioseismic wave field by using the three-dimensional Semi-spectral Linear MHD (SLiM) code and exciting small-amplitude waves by sources distributed in the near-surface layers of a model solar atmosphere.Our model atmosphere is realistic in the sense that it has a standard sound-speed profile. Our source function is a realization drawn from a random process specified by a statistical description of solar convection. We obtain a quiet-Sun power spectrum of wave motions, which is consistent with Doppler observations. In order to study wave propagation through sunspots, we derive a simplified monolithic model sunspot embedded in the quiet-Sun model atmosphere. The corresponding wave field computed with SLiM is then compared with MDI observations of f- and p-mode scattering by magnetic region AR9787. The comparison is encouraging as the numerical simulation is able to reproduce wave absorption and scattering phase shifts. As part of our analysis, we show the advantage of computing a reference quiet-Sun wave field using the same realization of the sources for the purpose of comparisons and noise reduction.
Bibtex entry for this abstract   Preferred format for this abstract (see Preferences)
   

Find Similar Abstracts:

Use: Authors
Title
Abstract Text
Return: Query Results Return    items starting with number
Query Form
Database: Astronomy
Physics
arXiv e-prints