Excitation and suppression of kink modes by coupling to ion-acoustic waves

Guzdar, P. N.; Sen, Abhijit; Kaw, P. K.

doi:10.1088/0029-5515/15/6/006

Cited by 2 publications

(1 citation statement)

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“…For example the excitation and suppression of kink modes by coupling to ion sound waves has been shown to be possible (Guzdar et al, 1975). This is accomplished by generating a torsional AlfvOn wave, whose azimuthal field B4, has an associated velocity V,I,, leading to a relative shear between concentric layers.…”

Section: Parametric Excitation Of Mhd Kl''k or Resistive Kink Modesmentioning

confidence: 99%

An unstable arch model of a solar flare

Spicer

1977

Sol Phys

173

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The theoretical consequences of assuming that a current flows along flaring arches consistent with a twist in the field lines of thesc arches are examined. It is found that a sequence of magneto-hydrodynamic (MHD) and resistive MHD instabilities driven by the assumed current (which we refer to as the toroidal current) can naturally explain most manifestations of a solar flare.The principal flare instability in the proposed model is the resistive kink (or tearing mode in arch geometry) which plays the role of thermalizing some of the field energy in the arch and generating X-configured neutral points needed for particle acceleration. The difference between thermal and nonthermal llares is elucidated and explained, in part, by amplitude-dependent instabilities, generally referred to as overlapping resonances. We show that the criteria for the generation of flare shocks strongly depend on the magnitude and gradient steepness of the toroidal current, which also are found to determine the volume and rate of energy release. The resulting model is in excellent agreement with present observations and has successfully predicted several flare phenomena.

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Section: Parametric Excitation Of Mhd Kl''k or Resistive Kink Modesmentioning

confidence: 99%