Oscillations excited by plasmoids formed during magnetic reconnection in vertical gravitationally stratified current-sheet

Abstract

Using the FLASH code, which solves the full set of the two-dimensional (2-D) non-ideal (resistive) time-dependent magnetohydrodynamic (MHD) equations, we study processes during the magnetic reconnection in a vertical gravitationally stratified current sheet. We show that during these processes, which correspond to processes in solar flares, plasmoids are formed due to the tearing mode instability of the current sheet. These plasmoids move upwards or downwards along the vertical current sheet, and some of them merge into larger plasmoids. We study the density and temperature structure of these plasmoids and their time evolution in details. We found that during the merging of two plasmoids the resulting larger plasmoid starts to oscillate; in our model with a $\sim 25\mathrm{s}$ period. On the other hand, the plasmoid moving downwards merges with the underlying flare arcade which also starts to oscillate during this process; in our model with a $\sim 35\mathrm{s}$ period. It is shown that the merging process of plasmoid with the flare arcade is a complex process as presented by complex density and temperature structures of the oscillating arcade. Moreover, all these processes are associated with magnetoacoustic waves produced by the motion and merging of plasmoids.

References in corpus (20)

• Impulsive phase flare energy transport by large-scale Alfven waves and the electron acceleration problem
• MHD Waves and Coronal Seismology: an overview of recent results
• Simultaneous Observation of Reconnection Inflow and Outflow Associated with the 2010 August 18 Solar Flare
• A Solution Accurate, Efficient and Stable Unsplit Staggered Mesh Scheme for Three Dimensional Magnetohydrodynamics
• Spontaneous current-layer fragmentation and cascading reconnection in solar flares: I. Model and analysis
• Quasi-periodic pulsations in solar and stellar flares: an overview of recent results
• Above-the-loop-top Oscillation and Quasi-periodic Coronal Wave Generation in Solar Flares
• Oscillatory processes in solar flares
• Propagation of Alfvénic Waves From Corona to Chromosphere and Consequences for Solar Flares
• Alfvénic Wave Heating of the Upper Chromosphere in Flares
• Magnetohydrodynamic shocks in and above post-flare loops: two-dimensional simulation and a simplified model
• Low-Altitude Reconnection Inflow-Outflow Observations during a 2010 November 3 Solar Eruption
• Inferring flare loop parameters with measurements of standing sausage modes
• Successive merging of plasmoids and fragmentation in flare current sheet and their X-ray and radio signatures
• Standing Sausage Modes In Nonuniform Magnetic Tubes: An Inversion Scheme For Inferring Flare Loop Parameters
• Reconnection of a kinking flux rope triggering the ejection of a microwave and hard X-ray source. I. Observations and Interpretation
• Impulsively generated sausage waves in coronal tubes with transversally continuous structuring
• Fast sausage modes in magnetic tubes with continuous transverse profiles: effects of a finite plasma beta
• Effects of non-WKB Alfven waves on a multicomponent solar wind with differential ion flow
• Spectroscopic Observations and Modelling of Impulsive Alfvén Waves Along a Polar Coronal Jet

Cited by in corpus (20)

• Modelling Quasi-Periodic Pulsations in Solar and Stellar Flares
• Persistent Quasi-Periodic Pulsations During a Large X-Class Solar Flare
• Magnetic Reconnection During the Post-Impulsive Phase of a Long-Duration Solar Flare: Bi-Directional Outflows as a Cause of Microwave and X-ray Bursts
• Broad Non-Gaussian Fe XXIV Line Profiles in the Impulsive Phase of the 2017 September 10 X8.3 class Flare Observed by Hinode/EIS
• Coronal Quasi-periodic Fast-mode Propagating Wave Trains
• A blueprint of state-of-the-art techniques for detecting quasi-periodic pulsations in solar and stellar flares
• On the observations of rapid forced reconnection in the solar corona
• A Hydrodynamic Model of Alfvénic Wave Heating in a Coronal Loop and its Chromospheric Footpoints
• Quasi-periodic Fast Propagating Magnetoacoustic Waves during the Magnetic Reconnection Between Solar Coronal Loops
• Quasi-periodic pulsations of gamma-ray emissions from a solar flare on 2017 September 06
• Statistical Study of Plasmoids associated with post-CME Current Sheet
• Forward Modeling of SDO/AIA and X-Ray Emission from a Simulated Flux Rope Ejection
• Numerical Study on Excitation of Turbulence and Oscillation in Above-the-loop-top Region of a Solar Flare
• The 2017 September 6 Flare: Radio Bursts and Pulsations in the 22-5000 MHz Range and Associated Phenomena
• Reflection of fast magnetosonic waves near magnetic reconnection region
• Oscillations and Waves in Radio Source of Drifting Pulsation Structures
• Pulse-beam heating of deep atmospheric layers triggering their oscillations and upwards moving shocks that can modulate the reconnection in solar flares
• The prominence driven forced reconnection in the solar corona and associated plasma dynamics
• Numerical Investigation of Efficient Electron Acceleration at an Unsteady Solar Flare Loop-Top
• Stratified Resistive Tearing Instability