2003/01/16 by T. V. Zaqarashvili · 1 citation
Mathematics · Physics and Astronomy · #Amplitude #Anatomy #Astro and Planetary Science #Astrophysics #Biology #Corona (planetary geology) #Coronal loop #Coronal mass ejection #Coronal plane #Geometry #Line (geometry) #Loop (graph theory) #Mathematics #Optics #Oscillation (cell signaling) #Physics #Plasma #Solar and Space Plasma Dynamics #Solar wind #Stellar, planetary, and galactic studies #Wavelength #astro-ph
paper · pdf · doi:10.1051/0004-6361:20030084
published as Astron.Astrophys.399:L15,2003 · Accepted in Astronomy and Astrophysics
arxiv created 2003/01/16 · openalex publication_date 2003/02/01 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
We suggest that the global torsional oscillation of solar coronal loop may be observed by the periodical variation of a spectral line width. The amplitude of the variation must be maximal at the velocity antinodes and minimal at the nodes of the torsional oscillation. Then the spectroscopic observation as a time series at different heights above the active region at the solar limb may allow to determine the period and wavelength of global torsional oscillation and consequently the Alfvén speed in corona. From the analysis of early observation (Egan & Schneeberger [CITE]) we suggest the value of coronal Alfvén speed as ~500 km s-1.