The physics of thermal instability in two dimensions |
| |
| Authors: | L Sparks G Van Hoven |
| |
| Institution: | (1) Department of Physics, University of California, 92717 Irvine, CA, U.S.A. |
| |
| Abstract: | Previous studies of a thermal (radiative) instability in a sheared magnetic field have shown that, under solar coronal conditions, cool condensations can form in a small neighborhood about the shear layer. Such results have served to model the formation of solar filaments (or prominences) observed to occur above photospheric magnetic polarity-inversion lines. A surprising conclusion of these studies is that the width of the condensation does not depend on the thermal conductivity (  ). By examining the mass-flow patterns of two-dimensional condensations in the absence of thermal conduction, we demonstrate that local plasma dynamics and the constraints imposed by boundary conditions are together sufficient to explain the size of the condensation width. In addition we present the results of a series of numerical calculations which illustrate the characteristic mode structure of sheared-field condensations. |
| |
| Keywords: | |
| 本文献已被 SpringerLink 等数据库收录！ |
|
