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Solar filaments are the largest magnetic structure that can be physicallytraced to the chromosphere. The structure and evolution of solar filaments areimportant for our understanding of solar atmosphere physics. In this work, weinvestigate a giant dark channel crossing the solar equator, which consists oftwo filament channels with different chiralities. From 2016 April 22 to April27, this giant dark channel occupied the solar disk. Within this giant channel,a filament channel with dextral chirality was detected in the northernhemisphere, and another filament channel with sinistral chirality was observedin the southern hemisphere. At the junction of the two filament channels, acusp structure was observed associated with active region (AR) 12532 near thesolar equator. The extrapolated three-dimensional magnetic fields reveal thatthis cusp structure was composed of two sets of field lines belonging to twodifferent filament channels and was rooted on the AR positive-polarity fields.In addition, dark material flows from filaments in the two channels to the cuspstructure were detected as well as the flux emergence and cancellation aroundthe cusp footpoints. On 2016 May 21, after a solar rotation, the cusp structurehad disappeared, and the giant dark channel broke in the middle where anotherAR, 12546, had emerged completely. We propose that the magnetic flux emergenceand cancellation around the cusp region resulted in the disappearance of thecusp structure and the break of the giant dark channel.

A giant dark channel across the solar equator consisting of two filament channels with different chiralities