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Record Details

Record 27 of 272
MHD thermal instabilities in cool inhomogeneous atmospheres
Author and Affiliation:
Bodo, G.(Osservatorio Astronomico, Turin, Italy)
Ferrari, A.(CNR, Istituto di Cosmo-Geofisica, Torino, Universita)
Massaglia, S.(Torino, Universita, Turin, Italy)
Rosner, R.(Harvard-Smithsonian Center for Astrophysics, Cambridge, MA, United States)
Abstract: The formation of a coronal state in a stellar atmosphere is investigated. A numerical code is used to study the effects of atmospheric gradients and finite loop dimension on the scale of unstable perturbations, solving for oscillatory perturbations as eigenfunctions of a boundary value problem. The atmosphere is considered as initially isothermal, with density and pressure having scale heights fixed by the hydrostatic equations. Joule mode instability is found to be an efficient mechanism for current filamentation and subsequent heating in initially cool atmospheres. This instability is mainly effective at the top of magnetic loops and is not suppressed by thermal conduction.
Publication Date: Jan 01, 1983
Document ID:
19830066329
(Acquired Nov 30, 1995)
Accession Number: 83A47547
Subject Category: ASTROPHYSICS
Document Type: Conference Paper
Publication Information: (SEE A83-47476 23-90)
Publisher Information: Netherlands
Meeting Information: Activity in red-dwarf stars; Seventy-first Colloquium; August 10-13, 1982; Catania; Italy
Contract/Grant/Task Num: NAGW-79
Financial Sponsor: NASA; United States
Organization Source: Consiglio Nazionale delle Ricerche; Turin, Italy
Turin Univ.; Cambridge, MA, United States
Harvard-Smithsonian Center for Astrophysics
Description: 3p; In English
Distribution Limits: Unclassified; Publicly available; Unlimited
Rights: Copyright
NASA Terms: MAGNETOHYDRODYNAMIC STABILITY; STELLAR ATMOSPHERES; STELLAR CORONAS; THERMAL INSTABILITY; ATMOSPHERIC MODELS
Imprint And Other Notes: IN: Activity in red-dwarf stars; Proceedings of the Seventy-first Colloquium, Catania, Italy, August 10-13, 1982 (A83-47476 23-90). Dordrecht, D. Reidel Publishing Co., 1983, p. 621-623. Research supported by the Consiglio Nazionale delle Ricerche.
Availability Source: Other Sources
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