OBSERVATIONS AND IMPLICATIONS OF LARGE-AMPLITUDE LONGITUDINAL OSCILLATIONS IN A SOLAR FILAMENT

On 2010 August 20, an energetic disturbance triggered large-amplitude longitudinal oscillations in a nearby filament. The triggering mechanism appears to be episodic jets connecting the energetic event with the filament threads. In the present work, we analyze this periodic motion in a large fractio...

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Published inThe Astrophysical journal Vol. 785; no. 1; pp. 1 - 13
Main Authors Luna, M, KNIZHNIK, K, Muglach, K, Karpen, J, Gilbert, H, Kucera, T A, URITSKY, V
Format Journal Article
LanguageEnglish
Published United States 10.04.2014
Subjects
Accretion
AMPLITUDES
ASTROPHYSICS, COSMOLOGY AND ASTRONOMY
Channels
DISTURBANCES
Estimates
FASTENING
FILAMENTS
GRAVITATION
Heating
MAGNETIC FIELDS
MASS
OSCILLATIONS
PERIODICITY
Radius of curvature
SUN
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Summary:On 2010 August 20, an energetic disturbance triggered large-amplitude longitudinal oscillations in a nearby filament. The triggering mechanism appears to be episodic jets connecting the energetic event with the filament threads. In the present work, we analyze this periodic motion in a large fraction of the filament to characterize the underlying physics of the oscillation as well as the filament properties. The results support our previous theoretical conclusions that the restoring force of large-amplitude longitudinal oscillations is solar gravity, and the damping mechanism is the ongoing accumulation of mass onto the oscillating threads. Based on our previous work, we used the fitted parameters to determine the magnitude and radius of curvature of the dipped magnetic field along the filament, as well as the mass accretion rate onto the filament threads. These derived properties are nearly uniform along the filament, indicating a remarkable degree of cohesiveness throughout the filament channel. Moreover, the estimated mass accretion rate implies that the footpoint heating responsible for the thread formation, according to the thermal nonequilibrium model, agrees with previous coronal heating estimates. We estimate the magnitude of the energy released in the nearby event by studying the dynamic response of the filament threads, and discuss the implications of our study for filament structure and heating.
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ISSN:0004-637X
1538-4357
DOI:10.1088/0004-637X/785/1/79