Bibcode
Bello González, N.; Franz, M.; Martínez-Pillet, V.; Bonet, J. A.; Solanki, S. K.; del Toro Iniesta, J. C.; Schmidt, W.; Gandorfer, A.; Domingo, V.; Barthol, P.; Berkefeld, T.; Knölker, M.
Bibliographical reference
The Astrophysical Journal Letters, Volume 723, Issue 2, pp. L134-L138 (2010).
Advertised on:
11
2010
Citations
64
Refereed citations
57
Description
We study the energy flux carried by acoustic waves excited by convective
motions at sub-photospheric levels. The analysis of high-resolution
spectropolarimetric data taken with IMaX/SUNRISE provides a total energy
flux of ~6400-7700 W m-2 at a height of ~250 km in the 5.2-10
mHz range, i.e., at least twice the largest energy flux found in
previous works. Our estimate lies within a factor of two of the energy
flux needed to balance radiative losses from the chromosphere according
to the estimates of Anderson & Athay and revives interest in
acoustic waves for transporting energy to the chromosphere. The acoustic
flux is mainly found in the intergranular lanes but also in small
rapidly evolving granules and at the bright borders, forming dark dots
and lanes of splitting granules.
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