| Abstract * |
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Longitudinal and transverse oscillations are frequently observed in the solar prominence 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 oscillation in 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 7th July 2017 it starts rising around 13 UT. Then we observe a failed
eruption and subsequently the filament threads start to oscillate around 16 UT. We observe both transverse and longitudinal oscillation
in filament threads.
We observe both transverse and longitudinal oscillation in filament threads. The oscillations then 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 found the longitudinal oscillation is of type large amplitude longitudinal oscillation (LALO). We also detect damping
in LALO. In one thread of filament, we observe large amplitude transverse oscillation (LATO). We estimate the magnetic field in
filament applying prominence seismology using the observed parameter of LATO. Using the pendulum model we estimate the lower
limit of magnetic field strength in filament from the observed parameter of LALO.
We show the co-existence of two different wave modes in the same filament thread. For the first time, we estimate
magnetic field from LALO and hence suggest a possible range of filament length using LATO. We also calculate the radius of
curvature of the filament using the observed parameter of LALO. |
