Lagrangian and Eulerian Stratifications of Acoustic Oscillations through the Solar Photosphere

Details Lagrangian and Eulerian Stratifications of Acoustic Oscillations through the Solar Photosphere Lagrangian and Eulerian Stratifications of Acoustic Oscillations through the Solar Photosphere

Jan 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001apj...547..491r&link_type=abstract

The Astrophysical Journal, Volume 547, Issue 1, pp. 491-502.

Astronomy and Astrophysics

Astronomy

5

Radiative Transfer, Sun: Oscillations, Sun: Photosphere

Scientific paper

We evaluate the stratification of acoustic oscillations in the solar photosphere in both the Lagrangian (comoving) frame of reference and the Eulerian (inertial) frame of reference, from a temporal sequence of model atmospheres in an optical depth scale obtained after a quasi-non-LTE inversion of the radiative transfer equation applied to spectral observations of the K I 7699 Å line. Our results suggest that, to first order, the photosphere moves up and down as a whole with amplitudes ranging from ~8 km in deep layers (around 0 km) to ~19 km in the upper layers (around 640 km). In Lagrangian coordinates, we observe numerous short-lived, local temperature and velocity amplitude enhancements in medium-high layers, together with asymmetric waveforms in the oscillation of these two physical quantities. The Lagrangian temperature oscillation clearly shows two nodes associated with sharp phase jumps of about 180°, whereas the velocity amplitude shows the well-known increase with geometrical height, at nearly constant phase. In Eulerian coordinates, the perturbations are dominated by the coherent oscillation of the entire photosphere.

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