The Influence of Magnetic Field on Oscillations in the Solar Chromosphere

Abstract

Two sequences of solar images obtained by the Transition Region and Coronal Explorer in three UV passbands are studied using wavelet and Fourier analysis and compared to the photospheric magnetic flux measured by the Michelson Doppler Interferometer on the Solar Heliospheric Observatory to study wave behaviour in differing magnetic environments. Wavelet periods show deviations from the theoretical cutoff value and are interpreted in terms of inclined fields. The variation of wave speeds indicates that a transition from dominant fast-magnetoacoustic waves to slow modes is observed when moving from network into plage and umbrae. This implies preferential transmission of slow modes into the upper atmosphere, where they may lead to heating or be detected in coronal loops and plumes.

arXiv comment8 pages, 6 figures (4 colour online only), accepted for publication in The Astrophysical Journal

References in corpus (4)

• Quiet Sun magnetic fields at high spatial resolution
• Dynamics of the Solar Magnetic Network: Two-dimensional MHD Simulations
• The distribution of Quiet Sun magnetic field strengths from 0 to 1800 G
• Are Electric Currents Heating the Magnetic Chromosphere?

Cited by in corpus (13)

• Nonlinear Fast Magnetoacoustic Wave Propagation in the Neighbourhood of a 2D magnetic X-point: Oscillatory Reconnection
• Non-linear numerical simulations of magneto-acoustic wave propagation in small-scale flux tubes
• Dynamics of the Solar Magnetic Network. II. Heating the Magnetized Chromosphere
• Propagating slow magnetoacoustic waves in coronal loops observed by Hinode/EIS
• Unnoticed magnetic field oscillations in the very quiet Sun revealed by Sunrise/IMaX
• MHD wave propagation from the sub-photosphere to the corona in an arcade-shaped magnetic field with a null point
• Magnetohydrodynamic waves driven by p-modes
• A New Look at Mode Conversion in a Stratified Isothermal Atmosphere
• Properties of oscillatory motions in a facular region
• Ultra-high-resolution Observations of MHD Waves in Photospheric Magnetic Structures
• Oscillatory behavior in the quiet Sun observed with the New Solar Telescope
• The Position of High Frequency Waves with Respect to the Granulation Pattern
• Propagation of High Frequency Waves in the Quiet Solar Atmosphere