2001A&A...367.1022J


Query : 2001A&A...367.1022J

2001A&A...367.1022J - Astronomy and Astrophysics, volume 367, 1022-1032 (2001/3-1)

Filament activity and photospheric magnetic evolution related to flares.

JIANG Y. and WANG J.

Abstract (from CDS):

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.

Abstract Copyright:

Journal keyword(s): Sun: prominences - Sun: filaments - Sun: activity - Sun: flares - Sun: magnetic fields

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