| Issue |
A&A
Volume 374, Number 2, August I 2001
|
|
|---|---|---|
| Page(s) | 662 - 674 | |
| Section | Stellar structure and evolution | |
| DOI | https://doi.org/10.1051/0004-6361:20010696 | |
| Published online | 15 August 2001 | |
Magnetic wave energy fluxes for late-type stars
I. Longitudinal tube waves
1
Institut für Theoretische Astrophysik der Universität Heidelberg, Tiergartenstr. 15, 69121 Heidelberg, Germany
2
Department of Physics, University of Texas at Arlington, Arlington, TX 76019, USA
Corresponding author: P. Ulmschneider, ulmschneider@ita.uni-heidelberg.de
Received:
17
July
2000
Accepted:
10
May
2001
The wave energy fluxes carried by longitudinal tube
waves along thin vertical magnetic flux tubes embedded
in atmospheres of late-type stars are computed. The
main physical process responsible for the generation
of these waves is the nonlinear time-dependent response
of the flux tubes to continuous and impulsive external
turbulent pressure fluctuations, which are represented
here by an extended Kolmogorov spatial and modified
Gaussian temporal energy spectrum. Both the wave energy
fluxes and spectra are calculated for population I stars
with effective temperatures ranging from Teff =
3500 K to 7000 K, and with gravities in the range 
. The obtained results show that the computed wave
energy may significantly contribute to the enhanced
heating observed in magnetic regions of late-type
stars.
Key words: methods: numerical / stars: chromospheres / stars: coronae / stars: magnetic fields / MHD
© ESO, 2001
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