Sign on

SAO/NASA ADS Astronomy Abstract Service

· Find Similar Abstracts (with default settings below)
· Electronic Refereed Journal Article (HTML)
· References in the article
· Citations to the Article (9) (Citation History)
· Refereed Citations to the Article
· Also-Read Articles (Reads History)
·
· Translate This Page
Title:
Mode Mixing by a Shallow Sunspot
Authors:
Barnes, G.; Cally, P. S.
Affiliation:
AA(Department of Mathematics and Statistics, P.O. Box 28M, Monash University, Victoria 3800, Australia ()), AB(Department of Mathematics and Statistics, P.O. Box 28M, Monash University, Victoria 3800, Australia)
Publication:
Solar Physics, v. 193, Issue 1/2, p. 373-382 (2000). (SoPh Homepage)
Publication Date:
04/2000
Origin:
KLUWER
Bibliographic Code:
2000SoPh..193..373B

Abstract

Sunspots are strong absorbers of f and p modes. A possible absorption mechanism is direct conversion to slow magnetoacoustic waves. Calculations based on vertical magnetic field models show that this works well for f modes, but is inadequate for p modes. Using a very simple `shallow spot' model, in which the effects of the magnetic field are accounted for solely by a surface condition, we investigate the possibility that p modes first scatter into f modes inside the spot, which are then more susceptible to conversion to slow modes. We find that the coupling between an incident p mode and the internal f mode is unlikely to be strong enough to account for the observed absorption, but that the incident modes do couple strongly to the acoustic jacket in some cases, leading to a region immediately around the sunspot where a significant fraction of the surface velocity is due to the jacket modes.
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