Damping and frequency reduction of the f-mode due to turbulent motion in the solar convection zone

M Medrek, K Murawski, Bernard Roberts

Research output: Contribution to journalArticlepeer-review

14 Citations (Scopus)

Abstract

Solar-f-mode properties were observed recently with high accuracy using high-resolution Michelson Doppler Imager (MDI) data from SOHO (Duvall et al. 1998). According to these observations, linewidths increase with wavenumber k and the f-mode frequency omega is significantly lower than the frequency omega(0) given by the simple dispersion relation omega(0)(2) = gk. This paper provides a possible explanation of these observations on the basis of the turbulent flow that is in the convection zone. The f-mode spends more time propagating against the flow than with the how. As a result, its effective speed and consequently frequency are reduced. This reduction is revealed by the real part of omega. A negative imaginary part of the frequency omega represents the damping of the coherent-f-mode field due to scattering by the turbulent flow. The f-mode damping is a result of the generation of the turbulent field at the expense of the coherent field.

Original languageEnglish
Pages (from-to)312-316
Number of pages5
JournalAstronomy & Astrophysics
Volume349
Publication statusPublished - Sept 1999

Keywords

  • convection
  • Sun : atmosphere
  • Sun : granulation
  • Sun : oscillations
  • turbulence
  • CHROMOSPHERIC MAGNETIC-FIELD
  • P-MODES
  • RANDOM FLOW
  • VELOCITY
  • EIGENFREQUENCIES
  • OSCILLATIONS
  • GENERATION
  • ATMOSPHERE
  • SOUND
  • WAVES

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