The 1991 October 24 flare: A challenge for standard models

Autor:	J. F. de La Beaujardiere, Hugh S. Hudson, Satoshi Masuda, Loren W. Acton, J. P. Wülser, Richard C. Canfield, Takeo Kosugi
Rok vydání:	1995
Předmět:	Physics Solar flare Astronomy Astronomy and Astrophysics Coronal loop Astrophysics Light curve Solar physics law.invention Protein filament Space and Planetary Science law H-alpha Chromosphere Flare
Zdroj:	The Astrophysical Journal. 440:386
ISSN:	1538-4357 0004-637X
DOI:	10.1086/175280
Popis:	The M9.8 solar flare of 1991 October 24 22:30 UT presents several interesting characteristics: (1) energy release starts high in the corona; (2) the primary chromospheric ribbons are initially well separated and do not move apart at an observable rate; (3) no evidence is found for an erupting filament or other driver. To explain this flare, we consider several canonical flare models, including a filament eruption, a confined filament eruption, current interruption, and interacting loops. We conclude that none of these scenarios unequivocally explains this flare. Two possibilities which cannot be ruled out are (1) the eruption of a filament unobservable in H-alpha which starts high in the corona and produces no ribbon motions smaller than our detection threshold and no perceptible expansion of the coronal X-ray source, and (2) energy release due to spontaneous, propagating reconnection which allows the system to essentially brighten in place.
Databáze:	OpenAIRE
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