Evolution of magnetic field (top row) and filament channel in AIA 171 Å (bottom row) for event 2. The AR 11938 consists of a large positive polarity patch (P0’, P0, and P1) surrounded with negative polarities (N0, N1). The different PILs (1, 2, 3) are shown in panel b. The filament appears as dark areas (panel c-d) and the bright thin loops are possibly arcades or magnetic field lines of the filament structure. The jet flowing towards the filament channel near the PIL2 is shown with an arrow in panel d. The dome and null-point-like structure is enclosed by a blue circle. The green and red contours in the bottom row are the HMI magnetic field contours of ±50 Gauss in strength, respectively. All images are aligned together at January 1, 2014, at 15:56 UT. The blue rectangular box is the FOV for Fig. 13.