Acoustic Oscillations in Solar and Stellar Flaring Loops

Abstract

Evolution of a coronal loop in response to an impulsive energy release is numerically modelled. It is shown that the loop density evolution curves exhibit quasi-periodic perturbations with the periods given approximately by the ratio of the loop length to the average sound speed, associated with the second standing harmonics of an acoustic wave. The density perturbations have a maximum near the loop apex. The corresponding field-aligned flows have a node near the apex. We suggest that the quasi-periodic pulsations with periods in the range 10-300 s, frequently observed in flaring coronal loops in the radio, visible light and X-ray bands, may be produced by the second standing harmonic of the acoustic mode.

References in corpus (1)

• Wide-Spectrum Slow Magnetoacoustic Waves in Coronal Loops

Cited by in corpus (37)

• Modelling Quasi-Periodic Pulsations in Solar and Stellar Flares
• Standing Slow-Mode Waves in Hot Coronal Loops: Observations, Modeling, and Coronal Seismology
• The first observed stellar X-ray flare oscillation: Constraints on the flare loop length and the magnetic field
• Above-the-loop-top Oscillation and Quasi-periodic Coronal Wave Generation in Solar Flares
• Slow-Mode Magnetoacoustic Waves in Coronal Loops
• The Source of Three-minute Magneto-acoustic Oscillations in Coronal Fans
• Determination of the Coronal Magnetic Field by Hot Loop Oscillations
• Observation of multiple sausage oscillations in cool postflare loop
• Persistent Quasi-Periodic Pulsations During a Large X-Class Solar Flare
• X-ray and EUV Observations of Simultaneous Short and Long Period Oscillations in Hot Coronal Arcade Loops
• Chromospheric Condensation and Quasi-periodic Pulsations in a Circular-ribbon Flare
• Damping of slow magnetoacoustic oscillations by the misbalance between heating and cooling processes in the solar corona
• Magnetohydrodynamic shocks in and above post-flare loops: two-dimensional simulation and a simplified model
• Flare Generated Acoustic Oscillations in Solar and Stellar Coronal Loops
• The periodic variations of a white-light flare observed with ULTRACAM
• Quasi-periodic oscillations in flares and coronal mass ejections associated with magnetic reconnection
• Hot Plasma Flows and Oscillations in the Loop-top Region During the September 10 2017 X8.2 Solar Flare
• Slow Magnetoacoustic Oscillations in the Microwave Emission of Solar Flares
• Modelling of Reflective Propagating Slow-mode Wave in a Flaring Loop
• Effect of a Radiation Cooling and Heating Function on Standing Longitudinal Oscillations in Coronal Loops
• Transverse oscillations in solar coronal loops induced by propagating Alfvenic pulses
• X-ray flare oscillations track plasma sloshing along star-disk magnetic tubes in Orion star-forming region
• Determination of transport coefficients by coronal seismology of flare-induced slow-mode waves: Numerical parametric study of 1D loop model
• Radiative Hydrodynamic Modeling of the Bastille-Day Flare (14 July, 2000): I. Numerical Simulations
• Evidence of Multiple Slow Acoustic Oscillations in the Stellar Flaring Loops of Proxima Centauri
• Quasi-periodic pulsations in a solar flare with an unusual phase shift
• Role of Non-Ideal Dissipation with Heating-Cooling Misbalance on the Phase Shifts of Standing Slow Magnetohydrodynamic Waves
• Oscillation Maps in the Broadband Radio Spectrum of the 1 August 2010 Event
• Compressive oscillations in hot coronal loops: Are sloshing oscillations and standing slow waves independent?
• Coronal seismology by slow waves in non-adiabatic conditions
• Quasi periodic oscillations of solar active regions in connection with their flare activity - NoRH observations
• Numerical simulation of the internal plasma dynamics of post-flare loops
• Excitation and evolution of coronal oscillations in self-consistent 3D radiative MHD simulations of the solar atmosphere
• Modeling solar coronal bright point oscillations with multiple nanoflare heated loops
• Possible evidence of induced repetitive magnetic reconnection in a superflare from a young solar-type star
• Oscillations in the 45-5000 MHz Radio Spectrum of the 18 April 2014 Flare
• Slow Magnetoacoustic Oscillations in Stellar Coronal Loops