Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999astl...25..833g&link_type=abstract
Astronomy Letters, Volume 25, Issue 12, December 1999, pp.833-841
Astronomy and Astrophysics
Astronomy
1
Scientific paper
A plane solar model atmosphere is used to study the frequency dependences of the phase velocity and excitation coefficients for a surface wave propagating along a jump in the thermodynamic parameters which simulates the transition region between the chromosphere and the corona. It has been established that there are two branches of one frequency dependence of the phase velocity that are separated by a "forbidden" frequency range. In this range, the wave is "outflowing", because it emits acoustic gravity waves into the chromosphere. The surface wave is shown to be excited most effectively for the relatively high-frequency branch of the phase velocity. The excitation coefficient for the vertical oscillation velocity has been found to increase with height in the corona in the relatively low-frequency range below the Brunt-Vaisala frequency for the chromosphere.
Gasilova L. A.
Petukhov Yu. V.
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