Volume 395, Number 3, December I 2002
|Page(s)||L51 - L54|
|Published online||18 November 2002|
Letter to the Editor
Evidence for short-period acoustic waves in the solar atmosphere
Universitäts-Sternwarte, Geismarlandstraße 11, 37083 Göttingen, Germany
2 Institut für Geophysik, Astrophysik und Meteorologie, Universitätsplatz 5, 8010 Graz, Austria
Corresponding author: M. Wunnenberg, email@example.com
Accepted: 17 October 2002
Short-period acoustic waves are thought to supply the energy for the radiative losses of the non-magnetic chromosphere of the Sun and, in general, of late-type stars. Here, we present evidence for the existence of waves in the solar atmosphere with periods in the range of 50 s 100 s. Two-dimensional time sequences with a cadence of 25 s were obtained from quiet Sun disk center in Fe i 5434 Å. The observations were performed with the “Göttingen” Fabry-Perot spectrometer in the Vacuum Tower Telescope at the Observatorio del Teide/Tenerife. They are subjected to speckle reconstruction and to a wavelet analysis. The atmospheric ranges forming the velocity signals are narrowed by linear combinations of Doppler maps from wavelengths near line center. The power in the short-period range is concentrated above intergranular spaces. We estimate an acoustic flux into the chromosphere of approximately 3 erg cm-2 s-1, as needed for the chromospheric radiative losses.
Key words: waves / Sun: photosphere / Sun: chromosphere
© ESO, 2002
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