Wave propagation in a solar quiet region and the influence of the magnetic canopy

Abstract

Aims. We seek indications or evidence of transmission/conversion of magnetoacoustic waves at the magnetic canopy, as a result of its impact on the properties of the wave field of the photosphere and chromosphere. Methods. We use cross-wavelet analysis to measure phase differences between intensity and Doppler signal oscillations in the Halpha, CaII H, and G-band.We use the height of the magnetic canopy to create appropriate masks to separate internetwork (IN) and magnetic canopy regions. We study wave propagation and differences between these two regions. Results. The magnetic canopy affects wave propagation by lowering the phase differences of progressive waves and allowing the propagation of waves with frequencies lower than the acoustic cut-off. We also find indications in the Doppler signals of Halpha of a response to the acoustic waves at the IN, observed in the CaII H line. This response is affected by the presence of the magnetic canopy. Conclusions. Phase difference analysis indicates the existence of a complicated wave field in the quiet Sun, which is composed of a mixture of progressive and standing waves. There are clear imprints of mode conversion and transmission due to the interaction between the p-modes and small-scale magnetic fields of the network and internetwork.

10 pages, 6 figures

References in corpus (7)

• The Solar Optical Telescope for the Hinode Mission: An Overview
• Solar Atmospheric Oscillations and the Chromospheric Magnetic Topology
• The Nature of Running Penumbral Waves Revealed
• Non-linear numerical simulations of magneto-acoustic wave propagation in small-scale flux tubes
• The solar chromosphere at high resolution with IBIS. II. Acoustic shocks in the quiet internetwork and the role of magnetic fields
• DOT Tomography of the Solar Atmosphere VII. Chromospheric Response to Acoustic Events
• Transmission and conversion of magnetoacoustic waves on the magnetic canopy in a quiet Sun region

Cited by in corpus (6)

• Waves in the lower solar atmosphere: the dawn of next-generation solar telescopes
• Vertical Propagation of Acoustic Waves in the Solar Inter-Network as Observed by IRIS
• Observational study of chromospheric heating by acoustic waves
• Fast magnetic wave could heat the solar low-beta chromosphere
• Spectroscopic study of solar transition region oscillations in the quiet-Sun observed by IRIS using Si IV spectral line
• A persistent quiet-Sun small-scale tornado. II. Oscillations