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We present imaging and spectroscopic diagnostics of a long filament duringits formation with the observations from the Chinese H$\alpha$ Solar Explorerand Solar Dynamics Observatory. The seed filament first appeared at about 05:00UT on 2022 September 13. Afterwards, it grew gradually and connected to anotherfilament segment nearby, building up a long filament at about 20:00 UT on thesame day. The CHASE H$\alpha$ spectra show an obvious centroid absorption withmild broadening at the main spine of the long filament, which is interpreted asthe evidence of filament material accumulation. More interestingly, near thefootpoints of the filament, persistent redshifts have been detected in theH$\alpha$ spectra during the filament formation, indicating continuous drainageof filament materials. Furthermore, through inspecting the extreme ultravioletimages and magnetograms, it is found that EUV jets and brightenings appearedrepeatedly at the junction of the two filament segments, where oppositemagnetic polarities converged and canceled to each other continuously. Theseresults suggest the occurrence of intermittent magnetic reconnection that notonly connects magnetic structures of the two filament segments but alsosupplies cold materials for the filament channel likely by the condensation ofinjected hot plasma, even though a part of cold materials fall down to thefilament footpoints at the same time.

Formation of a long filament through the connection of two filament segments observed by CHASE