Role of the Resistive and Thermal Instabilities in Dynamics of Quiescent Prominences

Details Role of the Resistive and Thermal Instabilities in Dynamics of Quiescent Prominences Role of the Resistive and Thermal Instabilities in Dynamics of Quiescent Prominences

Dec 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009agufmsh41b1653f&link_type=abstract

American Geophysical Union, Fall Meeting 2009, abstract #SH41B-1653

Astronomy and Astrophysics

Astrophysics

[7509] Solar Physics, Astrophysics, And Astronomy / Corona, [7524] Solar Physics, Astrophysics, And Astronomy / Magnetic Fields, [7531] Solar Physics, Astrophysics, And Astronomy / Prominence Eruptions

Scientific paper

We present the observations taken with the SOT instrument on Hinode in G-band and Ca H lines. High cadence data compiled in movies show clear evidence for several fundamental plasma instabilities. We combine the observational evidence and theoretical estimates to identify these instabilities. The following can be given as examples. (1) An analogue of the Kelvin-Helmholtz instability develops at the prominence/corona interface that manifests itself in growing ripples during a linear growth phase and may be followed by a nonlinear stage taking the form of an explosive instability corresponding to a CME ejection. This instability also includes the regime of "smoke ring" formation. (2) The appearence of "bubbles and spikes" typical to the Rayleigh-Taylor instability are observed. Their evolution and growth rates are found to be modified by both poloidal and toroidal components of magnetic field. (3) A resistive interchange instability, associated with an "unfavorable" magnetic field curvature relative to the density/temperature gradients, may be responsible for a hot barb formation, its evolution and collapse.

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