Numerical simulations of spicule formation in the solar atmosphere

Abstract

We study the upward propagation of a localized velocity pulse that is initially launched below the transition region within the solar atmosphere. The pulse quickly steepens into a shock, which may lead to the formation of spicules. We solve two-dimensional time-dependent magnetohydrodynamic equations numerically to find spatial and temporal dynamics of spicules. The numerical simulations show that the strong initial pulse may lead to the quasi periodic rising of chromospheric material into the lower corona in the form of spicules. The periodicity results from the nonlinear wake that is formed behind the pulse in the stratified atmosphere. The superposition of raising and falling off plasma portions resembles the time sequence of single and double (sometimes even triple) spicules, which is consistent with observational findings. The two-dimensional rebound shock model may explain the observed speed, width, and heights of type I spicules, as well as observed multi-structural and bi-directional flows. The model also predicts the appearance of spicules with 3-5 min period due to the consecutive shocks.

10 pages, 8 figures, accepted in A&A

References in corpus (3)

• Dynamic Fibrils are driven by Magnetoacoustic Shocks
• High Resolution Observations and Modeling of Dynamic Fibrils
• Magnetoacoustic shocks as driver of quiet Sun mottles

Cited by in corpus (40)

• Persistent Doppler shift oscillations observed with HINODE/EIS in the solar corona: spectroscopic signatures of Alfvenic waves and recurring upflows
• Solar fine-scale structures. I. Spicules and other small-scale, jet-like events at the chromospheric level: observations and physical parameters
• Partially Ionized Plasmas in Astrophysics
• Numerical simulations of solar macrospicules
• Kelvin-Helmholtz instability in solar chromospheric jets: theory and observation
• Frequency drifts of 3-min oscillations in microwave and EUV emission above sunspots
• Stellar Winds and Coronae of Low-mass Pop. II/III Stars
• Observations of quasi-periodic phenomena associated with a large blowout solar jet
• Jet formation in solar atmosphere due to magnetic reconnection
• Study of the Kinematics and Plasma Properties of A Solar Surge Triggered due to Chromospheric Activity in AR11271
• Two-fluid numerical simulations of solar spicules
• Rotating Network Jets in the quiet Sun as Observed by IRIS
• Observations of a pulse driven cool polar jet by SDO/AIA
• Chromospheric and Coronal Wave Generation in a Magnetic Flux Sheath
• Simulations of Alfven wave driving of the solar chromosphere - efficient heating and spicule launching
• Magnetic shocks and substructures excited by torsional Alfvén wave interactions in merging expanding flux tubes
• Newtonian CAFE: a new ideal MHD code to study the solar atmosphere
• Small-scale solar jet formation and their associated waves and instabilities
• The excitation of 5-min oscillations in the solar corona
• Oscillation of solar radio emission at coronal acoustic cut-off frequency
• Dispersive shock waves in partially ionised plasmas
• Kink instability of triangular jets in the solar atmosphere
• Numerical simulations of macrospicule jets under energy imbalance conditions in the solar atmosphere
• The Possibility of Kelvin-Helmholtz Instability in Solar Spicules
• The Relation between Solar Spicules and Magnetohydrodynamic Shocks
• Multiwavelength Observations of Supersonic Plasma Blob Triggered by Reconnection Generated Velocity Pulse in AR10808
• Phase mixing of propagating Alfven waves in a stratified atmosphere: Solar spicules
• Estimating the contribution of Alfvén waves to the process of heating the quiet solar corona
• Rapid Blue- and Red-shifted Excursions in H$\alpha$ line profiles synthesized from realistic 3D MHD simulations
• Numerical simulations of a two-fluid jet at a magnetic null point in a solar arcade
• Phase mixing of standing Alfven waves with shear flows in solar spicules
• Evidences to the pulse like origin of double spicules based on Hinode/SOT observations
• On the role of transition region on the Alfven wave phase mixing in solar spicules
• Numerical Simulations of Two-Fluid Magnetoacoustic Waves in the Solar Atmosphere
• Non-linear damping of visco-resistive Alfven waves in solar spicules
• On the Relationship between Solar Spicules and Propagating Coronal Disturbances: The Role of Shocks
• Mode coupling in solar spicule oscillations
• Transverse oscillations in solar spicules induced by propagating Alfvenic pulses
• Influence of the magnetic field topology in the evolution of small-scale two-fluid jets in the solar atmosphere
• The study of magnetic reconnection in solar spicules