Case 91

Joarder, Rita; Crundwell, Neil; Gibson, Matthew I.

doi:10.1007/978-0-85729-366-4_91

Cited by 1 publication

(1 citation statement)

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“…(1992), Oliver et al (1993), Joarder & Roberts (1993, and Oliver & Ballester (1995), who concluded that the oscillations were pressure driven. However it is unclear whether these linear studies are applicable to largeamplitude, low-frequency oscillations.…”

Section: Oscillation Physics: Restoring Force and Dampingmentioning

confidence: 99%

Large-Amplitude Longitudinal Oscillations in a Solar Filament

Luna¹,

Karpen

2012

ApJ

102

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We have developed the first self-consistent model for the observed large-amplitude oscillations along filament axes that explains the restoring force and damping mechanism. We have investigated the oscillations of multiple threads formed in long, dipped flux tubes through the thermal nonequilibrium process, and found that the oscillation properties predicted by our simulations agree with the observed behavior. We then constructed a model for the large-amplitude longitudinal oscillations that demonstrates that the restoring force is the projected gravity in the tube where the threads oscillate. Although the period is independent of the tube length and the constantly growing mass, the motions are strongly damped by the steady accretion of mass onto the threads by thermal nonequilibrium. The observations and our model suggest that a nearby impulsive event drives the existing prominence threads along their supporting tubes, away from the heating deposition site, without destroying them. The subsequent oscillations occur because the displaced threads reside in magnetic concavities with large radii of curvature. Our model yields a powerful seismological method for constraining the coronal magnetic field and radius of curvature of dips. Furthermore, these results indicate that the magnetic structure is most consistent with the sheared-arcade model for filament channels.

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Section: Oscillation Physics: Restoring Force and Dampingmentioning

confidence: 99%