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, firstname.lastname@example.org
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
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.