Impact of thermal misbalance on acoustic-gravity waves in the solar atmosphere
arXiv:2304.03227 · doi:10.1093/mnras/stad1005
Abstract
The joint effect of gravity and thermal misbalance on the dynamics of acoustic-gravity waves (AGW) in the solar atmosphere is considered. It is shown that the heating and cooling taken in the form of power functions lead to the linear dependence of stationary temperature profile. Estimates of the ratio of the characteristic length associated with thermal processes to the gravitational height show a predominant influence of thermal processes in the temperature range up to 2 MK and a comparable influence on the dynamics of AGW in the range from 2 to 10 MK. A study of the dispersion properties of AGW in an isothermal atmosphere showed that in regimes with an overwhelming influence of thermal processes, the acoustic cut-off frequency decreases up to times. At the same time, the maximum frequency of the gravitational mode (analog of the Brunt-Vaisala frequency in the medium without non-adiabatic heating and cooling) decreases with increasing power of thermal processes, and then the gravitational mode can become purely oscillatory.
References in corpus (31)
- CHIANTI -- an atomic database for emission lines -- Paper XVI: Version 10, further extensions
- Coronal heating by MHD waves
- Approximations for radiative cooling and heating in the solar chromosphere
- Kink oscillations of coronal loops
- Slow-Mode Magnetoacoustic Waves in Coronal Loops
- Solar coronal magnetic fields derived using seismology techniques applied to omnipresent sunspot waves
- Determination of the Coronal Magnetic Field by Hot Loop Oscillations
- MHD Waves in open coronal structures
- Evidence of thermal conduction suppression in a solar flaring loop by coronal seismology of slow-mode waves
- Formation of quasi-periodic slow magnetoacoustic wave trains by the heating/cooling misbalance
- Examining Periodic Solar Wind Density Structures Observed in the SECCHI Heliospheric Imagers
- Magnetohydrodynamic Fast Sausage Waves in the Solar Corona
- Damping of slow magnetoacoustic oscillations by the misbalance between heating and cooling processes in the solar corona
- Long-period intensity pulsations in the solar corona during activity cycle 23
- Seismological constraints on the solar coronal heating function
- The Distinction Between Thermal Nonequilibrium and Thermal Instability
- Frequency drifts of 3-min oscillations in microwave and EUV emission above sunspots
- A simple model of chromospheric evaporation and condensation driven conductively in a solar flare
- Radiation hydrodynamics in simulations of the solar atmosphere
- Plasma Beta Stratification in the Solar Atmosphere: A Possible Explanation for the Penumbra Formation
- Mixed properties of slow magnetoacoustic and entropy waves in a plasma with heating/cooling misbalance
- X-ray flare oscillations track plasma sloshing along star-disk magnetic tubes in Orion star-forming region
- Radiative cooling in collisionally and photo ionized plasmas
- Effect of Thermal Conductivity, Compressive Viscosity and Radiative Cooling on the Phase Shift of Propagating Slow Waves with and without Heating-Cooling Imbalance
- Quiet-Sun and Coronal Hole in \ion{Mg}{2}~k line as observed by IRIS
- Prevalence of Thermal Non-Equilibrium over an Active Region
- A new look at the frequency-dependent damping of slow-mode waves in the solar corona
- Dynamics of fast and slow magnetoacoustic waves in plasma slabs with thermal misbalance
- Oscillation of solar radio emission at coronal acoustic cut-off frequency
- Coronal Density and Temperature Profiles Calculated by Forward Modeling EUV Emission Observed by SDO/AIA
- Slow Magnetoacoustic Oscillations in Stellar Coronal Loops