Astronomy and Astrophysics – Astrophysics
Scientific paper
Mar 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001a%26a...367.1022j&link_type=abstract
Astronomy and Astrophysics, v.367, p.1022-1032 (2001)
Astronomy and Astrophysics
Astrophysics
12
Sun: Prominences, Sun: Filaments, Sun: Activity, Sun: Flares, Sun: Magnetic Fields
Scientific paper
Three successive activations of an active-region filament were observed over a period of eight hours. Each disturbance showed distinctive characteristics and was followed by a flare of different properties. The filament had one end rooted in strong δ-sunspots. During the first activation, the filament rose up at the rooting end and detached from the δ-sunspots while its main body remained in place and separated into two twisted threads. During the second activation, only one thread was disturbed and finally disappeared; twisted threads, however, appeared during the third activation. The evolution of photospheric magnetic fields, associated with the filament disturbances, was characterized by squeezing and shearing of δ-sunspots, flux cancellation and emergence beneath the two ends of the filaments. Our data suggests that magnetic reconnection in the photospheric layer is the likely cause of filament destabilisation.
Jiang Yuming
Wang Jeffrey
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