Effect of gravity on the fast modes of a horizontal coronal slab

M. P. McEwan, A. J. Diaz

Research output: Contribution to journalArticlepeer-review

6 Citations (Scopus)

Abstract

Theoretical studies of the normal modes of a coronal slab often neglect gravity, as in Edwin and Roberts (Solar Phys. 71, 239, 1982). Here we study analytically the effect of gravity acting on a horizontal slab as a first step away from a homogeneous medium. Because of the inclusion of gravity, the symmetry of a homogeneous slab is lost, so the normal modes cannot be classified into kink and sausage modes. The presence of gravity also modifies the oscillatory frequencies of the slab, as well as the lower cutoff frequency, resulting in the possible transition between surface and body modes. For general coronal parameters, the dimensionless gravity term turns out to be small, so these effects are also small.

Original languageEnglish
Pages (from-to)243-257
Number of pages15
JournalSolar Physics
Volume246
DOIs
Publication statusPublished - Nov 2007

Keywords

  • Sun : corona
  • Sun : oscillations
  • MAGNETICALLY STRUCTURED ATMOSPHERE
  • SOLAR P-MODES
  • WAVE-PROPAGATION
  • SURFACE-WAVES
  • F-MODES
  • OSCILLATIONS
  • LOOPS
  • FIELD

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