Wide-Spectrum Slow Magnetoacoustic Waves in Coronal Loops

Abstract

A model interpreting variations of EUV brightness upward propagating in solar coronal loops as slow magnetoacoustic waves is developed. A loop is considered to have a non-zero plane inclination angle and offset of circular loop centre from the baseline. The model also incorporates effects of dissipation and gravitational stratification. A linear evolutionary equation is derived and applied to investigation of slow wave dynamics. Both the non-zero plane inclination and the offset decrease the growth of the wave amplitude due to stratification. It is shown that wide spectrum slow magnetoacoustic waves, consistent with currently available observations in the low frequency part of the spectrum, can provide the rate of heat deposition sufficient to heat the loop. In this scenario, the heat would be deposited near the loop footpoints which agrees with the current observational data.

14 pages, 6 figures, submitted to Astron. Astrophys

Cited by in corpus (17)

• MHD Waves and Coronal Seismology: an overview of recent results
• Acoustic Oscillations in Solar and Stellar Flaring Loops
• Line-of-sight Effects on Observability of Kink and Sausage Modes in Coronal Structures with Imaging Telescopes
• Frequency-dependent damping in propagating slow magneto-acoustic waves
• Propagating Disturbances in Coronal Loops: A Detailed Analysis of Propagation Speeds
• Observed damping of the slow magnetoacoustic mode
• Dynamics in Sunspot Umbra as Seen in New Solar Telescope and Interface Region Imaging Spectrograph Data
• A mechanism for parallel electric field generation in the MHD limit: possible implications for the coronal heating problem in the two stage mechanism
• Radiative Hydrodynamic Modeling of the Bastille-Day Flare (14 July, 2000): I. Numerical Simulations
• Effect of Thermal Conductivity, Compressive Viscosity and Radiative Cooling on the Phase Shift of Propagating Slow Waves with and without Heating-Cooling Imbalance
• Phenomenological model of propagation of the elastic waves in a fluid-saturated porous solid with non-zero boundary slip velocity
• Excitation of flare-induced waves in coronal loops and the effects of radiative cooling
• Phase speed and frequency-dependent damping of longitudinal intensity oscillations in coronal loop structures observed with AIA/SDO
• Missing bits of the solar jigsaw puzzle: small-scale, kinetic effects in coronal studies
• Stability and mode analysis of solar coronal loops using thermodynamic irreversible energy principles
• Slow Magnetoacoustic Oscillations in Stellar Coronal Loops
• Enhanced Phase Mixing of Torsional Alfvén Waves in Stratified and Divergent Solar Coronal Structures, Paper I: Linear Solutions