Details

Autor(en) / Beteiligte

• Liu, Rui
• Kliem, Bernhard
• Torok, Tibor
• Liu, Chang
• Titov, Viacheslav S
• Lionello, Roberto
• Linker, Jon A
• Wang, Haimin

Titel

SLOW RISE AND PARTIAL ERUPTION OF A DOUBLE-DECKER FILAMENT. I. OBSERVATIONS AND INTERPRETATION

Ist Teil von

• The Astrophysical journal, 2012-09, Vol.756 (1), p.1-14

Ort / Verlag

United States

Erscheinungsjahr

2012

Quelle

EZB Electronic Journals Library

Beschreibungen/Notizen

• We study an active-region dextral filament that was composed of two branches separated in height by about 13 Mm, as inferred from three-dimensional reconstruction by combining SDO and STEREO-B observations. This "double-decker" configuration sustained for days before the upper branch erupted with a GOES-class M1.0 flare on 2010 August 7. Analyzing this evolution, we obtain the following main results. During the hours before the eruption, filament threads within the lower branch were observed to intermittently brighten up, lift upward, and then merge with the upper branch. A hard X-ray sigmoid, likely of coronal origin, formed in the gap between the two original filament branches in the impulsive phase of the associated flare. Left-handed magnetic helicity is inferred for both branches of the dextral filament. Two types of force-free magnetic configurations are compatible with the data, a double flux rope equilibrium and a single flux rope situated above a loop arcade.