Simultaneous longitudinal and transverse oscillations in filament threads after a failed eruption

Abstract

Longitudinal and transverse oscillations are frequently observed in the solar prominences and/or filaments. These oscillations are excited by a large scale shock wave, impulsive flares at one leg of the filament threads, or due to any low coronal eruptions. We report simultaneous longitudinal and transverse oscillations in the filament threads of a quiescent region filament. We observe a big filament in the north-west of the solar disk on $6^{th}$ July 2017. On $7^{th}$ July 2017 it starts rising around 13:00 UT. Then we observe a failed eruption and subsequently, the filament threads start to oscillate around 16 UT. We observe both transverse and longitudinal oscillations in a filament thread. The oscillations damp down and filament threads almost disappear. We place horizontal and vertical artificial slits on the filament threads to capture the longitudinal and transverse oscillations of the threads. Data from Atmospheric Imaging Assembly (AIA) onboard Solar Dynamics Observatory (SDO) is used to detect the oscillations. We find the signatures of large amplitude longitudinal oscillations (LALOs). We also detect damping in LALOs. In one thread of the filament, we observe large amplitude transverse oscillations (LATOs). Using the pendulum model we estimate the lower limit of magnetic field strength and radius of curvature from the observed parameter of LALOs. We show the co-existence of two different wave modes in the same filament threads. We estimate magnetic field from LALOs and hence suggest a possible range of the length of the filament threads using LATOs.

8 Pages and 8 figures. Accepted for publication in Astronomy & Astrophysics

References in corpus (13)

• Large Amplitude Longitudinal Oscillations in a Solar Filament
• Large amplitude oscillation of a polar crown filament in the pre-eruption phase
• Simultaneous Transverse Oscillations of a Prominence and a Filament and Longitudinal Oscillation of another Filament Induced by a Single Shock Wave
• Observations and Implications of Large-Amplitude Longitudinal Oscillations in a Solar Filament
• Transverse oscillations of flowing prominence threads observed with Hinode
• Large amplitude oscillatory motion along a solar filament
• Multiwavelength observations of a partially eruptive filament on 2011 September 8
• Simultaneous transverse and longitudinal oscillations in a quiescent prominence triggered by a coronal jet
• Large-Amplitude Oscillation of an Erupting Filament as Seen in EUV, H-alpha and Microwave Observations
• Large-Amplitude Longitudinal Oscillations Triggered by the Merging of Two Solar Filaments: Observations and Magnetic Field Analysis
• Large-amplitude longitudinal oscillations in a solar filament
• Simultaneous longitudinal and transverse oscillation in an active filament
• The effects of magnetic-field geometry on longitudinal oscillations of solar prominences: Cross-sectional area variation for thin tubes