Effect of Thermal Conductivity, Compressive Viscosity and Radiative Cooling on the Phase Shift of Propagating Slow Waves with and Without Heating-Cooling Imbalance
Abstract
We study the phase shifts of propagating slow magnetoacoustic waves in solar coronal loops invoking the effects of thermal conductivity, compressive viscosity, radiative losses, and heating-cooling imbalance. We derive the general dispersion relation and solve it to determine the phase shifts of density and temperature perturbations relative to the velocity and their dependence on the equilibrium parameters of the plasma such as the background density [γ _eff] using the linear MHD model. We find that in the presence of thermal conduction alone, γ _eff remains close to its classical value γ _eff match the observed value of γ _eff remains close to 5 /3 , but the phase difference is highly dependent on the form of the heating function.
- Publication:
-
Solar Physics
- Pub Date:
- June 2021
- DOI:
- 10.1007/s11207-021-01846-w
- arXiv:
- arXiv:2104.07604
- Bibcode:
- 2021SoPh..296..105P
- Keywords:
-
- Sun;
- Coronal dynamics;
- Oscillations and waves;
- MHD;
- Magnetic fields;
- corona;
- Astrophysics - Solar and Stellar Astrophysics
- E-Print:
- 32 Pages