scholarly journals Theoretical basal Ca ii and Mg ii fluxes for late-type stars: results from acoustic wave spectra with time-dependent ionization and multilevel radiation treatments

2015 ◽  
Vol 451 (2) ◽  
pp. 1824-1832 ◽  
Author(s):  
Diaa E. Fawzy
Keyword(s):  
Acoustic Wave ◽  
Time Dependent ◽  
Wave Spectra ◽  
Late Type ◽  
Radiation Treatments

THE TEMPERATURE DISTRIBUTION PRODUCED BY ACOUSTIC ABSORPTION: I. MACROSCOPIC TREATMENT

1966 ◽  
Vol 44 (12) ◽  
pp. 3001-3011 ◽  
Author(s):  
S. Simons
Keyword(s):  
Temperature Distribution ◽  
Acoustic Wave ◽  
Numerical Results ◽  
Time Dependent ◽  
Acoustic Absorption ◽  
Space And Time

A calculation is given of the temperature distribution in space and time produced by the absorption of an acoustic wave propagated inside a medium, under conditions in which the situation may be described macroscopically. The problem is considered for various geometries, and for both constant and time-dependent energies of the incident acoustic wave. Numerical results are obtained, and a discussion is given of their relevance to various experiments.

Dynamics and Heating of Chromospheres

2004 ◽  
Vol 219 ◽  
pp. 115-122 ◽  
Author(s):  
Wolfgang Kalkofen
Keyword(s):  
Temperature Profile ◽  
Acoustic Waves ◽  
Large Amplitude ◽  
Time Dependent ◽  
Temperature Structure ◽  
The Sun ◽  
Late Type ◽  
Spherical Waves ◽  
Spatial And Temporal Characteristics ◽  
Chromospheric Heating

Heating and dynamics of the solar as well as stellar chromospheres are separate phenomena, judging by their spatial and temporal characteristics in the Sun. Simulations of chromospheric heating in late-type stars as well as simulations of the dynamics of the large-amplitude oscillations of internetwork calcium bright points in the solar atmosphere reproduce the main features of the respective phenomena. Differences between models and observations imply (1) that the Sun has a permanent, hot chromosphere and that its temperature structure cannot be obtained by averaging the time-dependent temperature profile of a model that describes only the oscillations, and (2) that the acoustic waves causing the dynamics and the heating propagate upward as spherical waves.

scholarly journals Acoustic wave driven mass loss in late-type giant stars

1987 ◽  
Vol 122 ◽  
pp. 325-326 ◽  
Author(s):  
M. Cuntz ◽  
L. Hartmann ◽  
P. Ulmschneider
Keyword(s):  
Acoustic Wave ◽  
Mass Loss ◽  
Wave Field ◽  
Wave Energy ◽  
Acoustic Waves ◽  
Late Type ◽  
Large Wave ◽  
Giant Stars ◽  
Wave Energy Flux ◽  
Type Giant

Mass loss generated by radiatively damped acoustic waves is investigated. We find that a persistent wave energy flux leads to extended chromospheres. Mass loss is quite likely produced if the wave field retains a transient character and if large wave periods are used.

scholarly journals Kinetic structures of shear Alfvén and acoustic wave spectra in burning plasmas

2010 ◽  
Vol 260 ◽  
pp. 012022 ◽  
Author(s):  
F Zonca ◽  
A Biancalani ◽  
I Chavdarovski ◽  
L Chen ◽  
C Di Troia ◽  
...  
Keyword(s):  
Acoustic Wave ◽  
Wave Spectra ◽  
Burning Plasmas

Time-dependent signatures of acoustic wave biosensors

2003 ◽  
Vol 91 (6) ◽  
pp. 890-901 ◽  
Author(s):  
W.D. Hunt ◽  
D.D. Stubbs ◽  
Sang-Hun Lee
Keyword(s):  
Acoustic Wave ◽  
Time Dependent
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