Effects of thermal conduction and compressive viscosity on the period ratio of the slow mode

Cicely Krystyna Macnamara, Bernard Roberts

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)
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Abstract

Aims: Increasing observational evidence of wave modes brings us to a closer understanding of the solar corona. Coronal seismology allows us to combine wave observations and theory to determine otherwise unknown parameters. The period ratio, P1/2P2, between the period P1 of the fundamental mode and the period P2 of its first overtone, is one such tool of coronal seismology and its departure from unity provides information about the structure of the corona. Methods: We consider analytically the effects of thermal conduction and compressive viscosity on the period ratio for a longitudinally propagating sound wave. Results: For coronal values of thermal conduction the effect on the period ratio is negligible. For compressive viscosity the effect on the period ratio may become important for some short hot loops. Conclusions: Damping typically has a small effect on the period ratio, suggesting that longitudinal structuring remains the most significant effect.
Original languageEnglish
Article numberA41
Number of pages7
JournalAstronomy & Astrophysics
Volume515
Early online date8 Jun 2010
DOIs
Publication statusPublished - Jun 2010

Keywords

  • Sun: corona
  • Sun: oscillations

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