  Large-amplitude oscillations (LAOs) are often detected in filaments. Using
multiwavelength observations, their origin can be traced back to the
interaction with eruptions and jets. We present two different case studies as
observational evidence in support of 2.5D MHD numerical experiments that show
that the LAOs in the filament channels can be initiated by solar jets. In the
two studied events, we can identify a quadrupolar configuration with an X-point
at the top of the parasitic region suggestive of a classical null-point. A
reconnection flow emanates from this structure leading to a jet that propagates
along the filament channel. In both cases we can identify the quiescent and
eruptive phases of the jet. The triggered LAOs have periods of around 70-80
minutes and are damped after a few oscillations. The minimum magnetic field
intensity inferred with seismology for the filament turns out to be around 30
Gauss. We conclude that the two case studies are consistent with the recent
numerical model of Luna and Moreno-Insertis (2021), in which the LAOs are
initiated by jets. The relationship between the onset of the jet and filament
oscillations is straight-forward for the first case and less for the second
case. In the second event, although there is some evidence, we cannot rule out
other possibilities such as activity unrelated to the null-point or changes in
the magnetic structure of the filament. Both jets are associated with very weak
flares which did not launch any EUV wave. Therefore the role of EUV waves for
triggering the filament oscillations can be eliminated for these two case.
