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.
Bibliographical reference
The Astrophysical Journal Letters, Volume 723, Issue 2, pp. L175-L179 (2010).
Advertised on:
11
2010
Citations
26
Refereed citations
22
Description
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.
Related projects
Solar and Stellar Magnetism
Magnetic fields are at the base of star formation and stellar structure and evolution. When stars are born, magnetic fields brake the rotation during the collapse of the mollecular cloud. In the end of the life of a star, magnetic fields can play a key role in the form of the strong winds that lead to the last stages of stellar evolution. During
Tobías
Felipe García