Channeling 5-min photospheric oscillations into the solar outer atmosphere through small-scale vertical magnetic flux tubes

TL;DR

This study uses 2D MHD simulations to show how small-scale vertical magnetic flux tubes enable 5-minute photospheric oscillations to propagate into the solar chromosphere, aligning with observational data.

Contribution

It demonstrates the role of magnetic flux tubes in facilitating wave leakage from the photosphere to the chromosphere, highlighting the impact of radiative energy exchange on wave propagation.

Findings

Simulations confirm wave leakage into the chromosphere via magnetic flux tubes.

Radiative energy exchange reduces the cut-off frequency, enabling 5-minute wave propagation.

Results agree with spectropolarimetric observations from TIP at 10830 Å.

Abstract

We report two-dimensional MHD simulations which demonstrate that photospheric 5-min oscillations can leak into the chromosphere inside small-scale vertical magnetic flux tubes. The results of our numerical experiments are compatible with those inferred from simultaneous spectropolarimetric observations of the photosphere and chromosphere obtained with the Tenerife Infrared Polarimeter (TIP) at 10830 A. We conclude that the efficiency of energy exchange by radiation in the solar photosphere can lead to a significant reduction of the cut-off frequency and may allow for the propagation of the 5 minutes waves vertically into the chromosphere.