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Titolo:
Fast MHD oscillations in prominence fine structures
Autore:
Diaz, AJ; Oliver, R; Erdelyi, R; Ballester, JL;
Indirizzi:
Univ Illes Balears, Dept Fis, E-07071 Palma de Mallorca, Spain Univ Illes Balears Palma de Mallorca Spain E-07071 ma de Mallorca, Spain Univ Sheffield, Dept Appl Math, Space & Atmosphere Res Ctr, Sheffield S3 7RH, S Yorkshire, England Univ Sheffield Sheffield S Yorkshire England S3 7RH S Yorkshire, England
Titolo Testata:
ASTRONOMY & ASTROPHYSICS
fascicolo: 3, volume: 379, anno: 2001,
pagine: 1083 - 1097
SICI:
1432-0746(200112)379:3<1083:FMOIPF>2.0.ZU;2-O
Fonte:
ISI
Lingua:
ENG
Soggetto:
FLUX TUBE MODEL; CENTER-TO-LIMB; SOLAR PROMINENCES; FIBRIL STRUCTURE; H-ALPHA; QUIESCENT FILAMENTS; WAVE-PROPAGATION; VELOCITIES; STABILITY; DYNAMICS;
Keywords:
Sun : oscillations; Sun : magnetic fields; Sun : corona; Sun : prominences;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
36
Recensione:
Indirizzi per estratti:
Indirizzo: Diaz, AJ Univ Illes Balears, Dept Fis, E-07071 Palma de Mallorca, Spain Univ Illes Balears Palma de Mallorca Spain E-07071 lorca, Spain
Citazione:
A.J. Diaz et al., "Fast MHD oscillations in prominence fine structures", ASTRON ASTR, 379(3), 2001, pp. 1083-1097

Abstract

High-resolution observations suggest that quiescent solar prominences are made of small-scale fibrils stacked one after another in both the vertical and horizontal directions. These fibrils are interpreted as the cool, highermost part of much larger coronal loops which are rooted in the solar photosphere. On the other hand, there is some evidence showing that small amplitude oscillations in prominences can affect individual or groups of fibrils,which vibrate with their own periods. Using a simple magnetostatic model to represent the fibril structure of quiescent solar prominences, Joarder etal. (1997) investigated some oscillatory properties of the Alfven and fastmagnetohydrodynamic modes. In this paper, with a proper treatment of boundary conditions, we reexamine their configuration and explore more deeply the basic features (mainly frequency and spatial structure) of the fast mode. The main conclusion is that, for reasonable values of the fibril's width, perturbations extend far away from its axis and, therefore, a single oscillating fibril can excite oscillations in neighbouring ones.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 01/10/20 alle ore 23:51:26