2004/01/19 by V. M. Nakariakov, D. Tsiklauri, A. J. Kelly +4 · 5 citations
Physics and Astronomy · #Acoustics #Astrophysics #Computational physics #Coronal hole #Coronal loop #Coronal mass ejection #Harmonic #Harmonics #Ionosphere and magnetosphere dynamics #Loop (graph theory) #Magnetic field #Optics #Physics #Solar and Space Plasma Dynamics #Solar wind #Stellar, planetary, and galactic studies #Voltage #astro-ph
paper · pdf · doi:10.1051/0004-6361:20031738
published as Astron.Astrophys. 414 (2004) L25-L28
openalex publication_date 2004/01/19 · arxiv created 2004/02/10 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
Evolution of a coronal loop in response to an impulsive energy release is numerically modelled. It is shown that the loop density evolution curves exhibit quasi-periodic perturbations with the periods given approximately by the ratio of the loop length to the average sound speed, associated with the second standing harmonics of an acoustic wave. The density perturbations have a maximum near the loop apex. The corresponding field-aligned flows have a node near the apex. We suggest that the quasi-periodic pulsations with periods in the range 10–300 s, frequently observed in flaring coronal loops in the radio, visible light and X-ray bands, may be produced by the second standing harmonic of the acoustic mode.