2004/02/11 by D. Tsiklauri, V. M. Nakariakov, T. D. Arber +1 · 1 citation
Biochemistry, Genetics and Molecular Biology · Physics and Astronomy · #Baryon acoustic oscillations #Coronal loop #Excitation #Geomagnetism and Paleomagnetism Studies #Harmonic #Ionosphere and magnetosphere dynamics #Loop (graph theory) #Magnetic field #Oscillation (cell signaling) #Solar and Space Plasma Dynamics #Spectral density #Work (physics) #astro-ph
paper · pdf · doi:10.1051/0004-6361:20040299
published as Astron.Astrophys. 422 (2004) 351-355 · Full paper, see also letter astro-ph/0402223 or Astron. and Astrophys., 414, L25-L28 (2004)
arxiv created 2004/02/11 · openalex publication_date 2004/07/01 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
Long period longitudinal oscillations of a flaring coronal loop are studied numerically. In the recent work of Nakariakov et al. (2004) it has been shown that the time dependence of density and velocity in a flaring loop contain pronounced quasi-harmonic oscillations associated with the 2nd harmonic of a standing slow magnetoacoustic wave. In this work we investigate the physical nature of these oscillations in greater detail, namely, their spectrum (using the periodogram technique) and how heat positioning affects mode excitation. We found that excitation of such oscillations is practically independent of the location of the heat deposition in the loop. Because of the change of the background temperature and density, the phase shift between the density and velocity perturbations is not exactly a quarter of the period; it varies along the loop and is time dependent, especially in the case of one footpoint (asymmetric) heating.