Dispersion of Slow Magnetoacoustic Waves in the Active Region Fan Loops Introduced by Thermal Misbalance

Abstract

Slow magnetoacoustic waves observed in the solar corona are used as seismological probes of plasma parameters. It has been shown that dispersion properties of such waves can vary significantly under the influence of the wave-induced thermal misbalance. In the current research, we study the effect of misbalance on waves inside the magnetic-flux tube under the second-order thin-flux-tube approximation. Using the parameters of active region fan coronal loops, we calculated wave properties such as the phase speed and decrement. It is shown that neglecting thermal misbalance may be the reason for the substantial divergence between seismological and spectrometric estimations of plasma parameters. We also show that the frequency dependence of phase speed is affected by two features, namely the geometric dispersion and the dispersion caused by the thermal misbalance. In contrast to the phase speed, the wave decrement primarily is affected by the thermal misbalance only. The dependencies of the phase speed and decrement of the slow wave on magnetic field and tube cross-section are also analyzed.

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Cited by in corpus (5)

• The solar corona as an active medium for magnetoacoustic waves
• 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
• Exact solution to the problem of slow oscillations in coronal loops and its diagnostic applications
• The effect of thermal misbalance on magnetohydrodynamic modes in coronal magnetic cylinders