Eclipse observations of high-frequency oscillations in active region coronal loops

A. C. Katsiyannis, D. R. Williams, R. T.J. McAteer, P. T. Gallagher, F. P. Keenan, F. Murtagh

Research output: Contribution to journalArticle

60 Citations (Scopus)

Abstract

One of the mechanisms proposed for heating the corona above solar active regions is the damping of magnetohydrodynamic (MHD) waves. Continuing on previous work, we provide observational evidence for the existence of high-frequency MHD waves in coronal loops observed during the August 1999 total solar eclipse. A wavelet analysis is used to identify twenty 4×4 arcsec2 areas showing intensity oscillations. All detections lie in the frequency range 0.15-0.25 Hz (7-4 s), last for at least 3 periods at a confidence level of more than 99% and arise just outside known coronal loops. This leads us to suggest that they occur in low emission-measure or different temperature loops associated with the active region.

Original languageEnglish
Pages (from-to)709-714
Number of pages6
JournalAstronomy and Astrophysics
Volume406
Issue number2
DOIs
Publication statusPublished - 1 Aug 2003
Externally publishedYes

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