Bibcode
Roth, M.; Franz, M.; Bello González, N.; Martínez-Pillet, V.; Bonet, J. A.; Gandorfer, A.; Barthol, P.; Solanki, S. K.; Berkefeld, T.; Schmidt, W.; del Toro Iniesta, J. C.; Domingo, V.; Knölker, M.
Referencia bibliográfica
The Astrophysical Journal Letters, Volume 723, Issue 2, pp. L175-L179 (2010).
Fecha de publicación:
11
2010
Número de citas
26
Número de citas referidas
22
Descripción
Solar oscillations are expected to be excited by turbulent flows in the
intergranular lanes near the solar surface. Time series recorded by the
IMaX instrument on board the SUNRISE observatory reveal solar
oscillations at high spatial resolution, which allow the study of the
properties of oscillations with short wavelengths. We analyze two time
series with synchronous recordings of Doppler velocity and continuum
intensity images with durations of 32 minutes and 23 minutes,
respectively, recorded close to the disk center of the Sun to study the
propagation and excitation of solar acoustic oscillations. In the
Doppler velocity data, both the standing acoustic waves and the
short-lived, high-degree running waves are visible. The standing waves
are visible as temporary enhancements of the amplitudes of the
large-scale velocity field due to the stochastic superposition of the
acoustic waves. We focus on the high-degree small-scale waves by
suitable filtering in the Fourier domain. Investigating the propagation
and excitation of f- and p 1-modes with wavenumbers k>1.4
Mm-1, we also find that exploding granules contribute to the
excitation of solar p-modes in addition to the contribution of
intergranular lanes.
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