scholarly journals Kinetic Ballooning Instability of the Near‐Earth Magnetotail in Voigt Equilibrium

2020 ◽  
Vol 125 (9) ◽  
Author(s):  
Abdullah Khan ◽  
Ping Zhu ◽  
Rui Han ◽  
Ahmad Ali
Keyword(s):  
Ballooning Instability

Ballooning Instability in Coronal Flare Loops

Solar Physics ◽  
2008 ◽  
Vol 253 (1-2) ◽  
pp. 161-172 ◽  
Author(s):  
Y. T. Tsap ◽  
Y. G. Kopylova ◽  
A. V. Stepanov ◽  
V. F. Melnikov ◽  
K. Shibasaki
Keyword(s):  
Ballooning Instability ◽  
Flare Loops

scholarly journals Quasi-separatrix Layers Induced by Ballooning Instability in Near-Earth Magnetotail

2019 ◽  
Author(s):  
Ping Zhu ◽  
Zechen Wang ◽  
Jun Chen ◽  
Xingting Yan ◽  
Rui Liu
Keyword(s):  
Numerical Simulations ◽  
Magnetic Reconnection ◽  
Solar Physics ◽  
Close Correlation ◽  
Satellite Observations ◽  
Two Dimensional ◽  
3 Dimensional ◽  
Ballooning Instability ◽  
3D Geometry ◽  
Alternative Means

Abstract. Magnetic reconnection processes in the near-Earth magnetotail can be highly 3-dimensional (3D) in geometry and dynamics, even though the magnetotail configuration itself is nearly two dimensional due to the symmetry in the dusk-dawn direction. Such reconnection processes can be induced by the 3D dynamics of nonlinear ballooning instability. In this work, we explore the global 3D geometry of the reconnection process induced by ballooning instability in the near-Earth magnetotail by examining the distribution of quasi-separatrix layers associated with plasmoid formation in the entire 3D domain of magnetotail configuration, using an algorithm previously developed in context of solar physics. The 3D distribution of quasi-separatrix layers (QSLs) as well as their evolution directly follows the plasmoid formation during the nonlinear development of ballooning instability in both time and space. Such a close correlation demonstrates a strong coupling between the ballooning and the corresponding reconnection processes. It further confirms the intrinsic 3D nature of the ballooning-induced plasmoid formation and reconnection processes, in both geometry and dynamics. In addition, the reconstruction of the 3D QSL geometry may provide an alternative means for identifying the location and timing of 3D reconnection sites in magnetotail from both numerical simulations and satellite observations.

Electrostatic Thermonuclear Ballooning Instability due to Slowed down Alpha Particles and Associated Diffusion Fluxes

1982 ◽  
Vol 51 (1) ◽  
pp. 304-310 ◽  
Author(s):  
Sanae-Inoue Itoh ◽  
Kimitaka Itoh ◽  
Takashi Tuda ◽  
Shinji Tokuda
Keyword(s):  
Alpha Particles ◽  
Ballooning Instability

scholarly journals The increase of curvature radius of geomagnetic field lines preceding a classical dipolarization

2019 ◽  
Author(s):  
Osuke Saka
Keyword(s):  
Field Line ◽  
Electric Fields ◽  
Flux Tube ◽  
Slow Wave ◽  
Equatorial Plane ◽  
Curvature Radius ◽  
Flux Tubes ◽  
Ballooning Instability ◽  
Field Lines ◽  
Bursty Bulk Flows

Abstract. Downstream observations at geosynchronous altitudes of field line dipolarization exhibit fundamental component of substorms associated with high velocity magnetotail flow bursts referred to as Bursty Bulk Flows. In growth phase of substorms, we found that the magnetosphere at geosynchronous orbit are in unstable conditions for Ballooning instability due to the appreciable tailward stretching of the flux tubes, and for slow magnetoacoustic wave due to the continuing field-aligned inflows of plasma sheet plasmas towards the equatorial plane. We propose following scenario of field line dipolarization in downstream locations; (1) The slow wave was excited through Ballooning instability by the arrival of Dipolarization Front at the leading edge of Bursty Bulk Flows. (2) In the equatorial plane, slow wave stretched the flux tube in dawn-dusk directions, which resulted in the spreading plasmas in dawn-dusk directions and reducing the radial pressure gradient in the flux tube. (3) As a result, the flux tube becomes a new equilibrium geometry in which curvature radius of new field lines increased in meridian plane, suggesting an onset of field line dipolarization. (4) Increasing curvature radius induced inductive electric fields of the order of few mV/m pointing westward in the equatorial plane, as well as radial electric fields associated with stretching flux tubes in dawn-dusk directions. Westward electric fields transmitted to the ionosphere produce a dynamic ionosphere where the E layer contains both dynamo (E · J  0) processes in it for generating field-aligned current system of Bostrom type. The dipolarization processes associated with changing the curvature radius occurred in the transitional intervals lasting for about 10 minutes preceding classical dipolarization composed of reduction of cross-tail currents and pileup of the magnetic fields transported from the tail.

Gravitational ballooning instability of prominences

Solar Physics ◽  
1994 ◽  
Vol 149 (1) ◽  
pp. 63-72 ◽  
Author(s):  
H. R. Strauss ◽  
D. W. Longcope
Keyword(s):  
Ballooning Instability

Alfven modes of solar coronal magnetic arches: Excitation of ballooning instability and modulation of flare emission

2008 ◽  
Vol 46 (4) ◽  
pp. 294-300 ◽  
Author(s):  
A. V. Stepanov ◽  
Yu. G. Kopylova ◽  
Yu. T. Tsap
Keyword(s):  
Ballooning Instability ◽  
Solar Coronal

scholarly journals Understanding the turbulent mechanisms setting the density decay length in the tokamak scrape-off layer

2020 ◽  
Vol 86 (1) ◽  
Author(s):  
Carrie F. Beadle ◽  
Paolo Ricci
Keyword(s):  
Numerical Simulations ◽  
Magnetic Configuration ◽  
Tokamak Plasma ◽  
Decay Length ◽  
Ballooning Instability ◽  
Simulation Results ◽  
Experimental Values ◽  
Two Fluid

Mechanisms setting the density decay in the scrape-off layer (SOL) at the outer midplane of a tokamak plasma are disentangled using two-fluid numerical simulations in a double-null magnetic configuration and analytical estimates. Typical experimental observations are retrieved, in particular increasing intermittency of the turbulence going from the near to the far SOL, which is reflected in two different density decay lengths. The decay length of the near SOL is well described as the result of transport driven by a nonlinearly saturated ballooning instability, while in the far SOL, the density decay length is described using a model of intermittent transport mediated by blobs. The analytical estimates of the decay lengths agree well with the simulation results and typical experimental values and can therefore be used to guide tokamak design and operation.

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