Degree Type

Dissertation

Date of Award

2003

Degree Name

Doctor of Philosophy

Department

Physics and Astronomy

First Advisor

Lee Anne Willson

Abstract

A new three-dimensional hydrodynamics code has been developed to model the propagation of acoustically generated waves in stellar atmospheres, in particular the solar atmosphere. These waves are generated using an artificial pulsing boundary, representing the top of the convection zone. The resulting shock waves and subsequent oscillations and atmospheric heating are studied from sub-photospheric to coronal levels. The initial results from this code are presented.;The new code has been developed from a pre-existing one-dimensional Lagrangian hydrodynamic code, developed at Iowa State University over the last 25 years to successfully model the effects of acoustically generated waves propagating through the atmospheres of large pulsating stars. This work includes the addition of the two horizontal dimensions; these dimensions receive Eulerian treatments. The original Lagrangian treatment in the vertical direction has been maintained for increased resolution of shock wave propagation, creating a Lagrangian/Eulerian combination code. The new code further allows for a wider ranging input of stellar parameters, making it applicable to solar type stars.

DOI

https://doi.org/10.31274/rtd-180813-33

Publisher

Digital Repository @ Iowa State University, http://lib.dr.iastate.edu

Copyright Owner

Gary Wayne Turner

Language

en

Proquest ID

AAI3085948

File Format

application/pdf

File Size

397 pages

Share

COinS