ner_tags: O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O
tokens: region creates a bright patch between n0 and p1, and hot plasma escapes out along the new open field to become the spire of Phase 1. The spire is collimated by the dominant strong open magnetic flux. Heat from the reconnection is magnetically confined to a small volume in the closed field below the reconnection location and so shows up as a brightening, but in the open field above the reconnection site it is spread over a much larger volume and so does not lead to a brightening in region n1. The continuous magnetic cancellation makes the jet move sideways. It can be seen, by comparing Figures 7 (b) and (c), that the location of the open field line that has just reconnected (and therefore the spire) moves to the left as reconnection proceeds. This transverse motion can be faster than the photospheric cancellation speed, since the transverse motion of photospheric sources can lead to a buildup of a current sheet that subsequently reconnects. Phase 2 is driven by the subsequent cancellation between n0 and p2 (Figure 7 (d)) and produces a spire and a brightening in the same manner as in Phase 1. It is possible that the two phases are independent of one another, but this is unlikely since they occur so close in time and space and the spire has a more or less smooth motion, which suggests that the first phase helped trigger the second phase or that the fragments p1 and p2 are not independent but are linked somehow by a common convection pattern in the moat below the photosphere. Figure 7. Schematic of the topology and magnetic reconnection in the two successive phases of a complex jet showing a few representative field lines marked by light-headed arrows before and after bursts of reconnections. (a) Before reconnection n0 and the outer parts of n1 and n2 are open magnetic fields with negative polarity. On both sides of n0, there are closed magnetic fields with positive polarities p1 and p2 linking to the inner parts of the negative polarities n1 and n2, as shown. Arrows mark the direction of magnetic field lines. (b) Phase 1 of the reconnection process driven by magnetic cancellation between n0 and p1. Reconnection takes place at the X-point, with plasma velocities shown by solid-headed arrows. The upward-moving outflow jet from the reconnection site is channeled upward by the open field lines as a spire. The separatrices and the field lines that have reconnected (a new open field line and a new closed field line) are marked in red. The location of a chromospheric brightening is also indicated below the reconnection location and straddling n0 and p1. (c) Phase 1 continues with more reconnection at the X-point and so creates a lateral motion of the spire. (d) Phase 2 repeats the same process, but at the X-point on the left side of n0, driven by magnetic cancellation as p2 approaches n0. The separatrices and the newly reconnected field lines are shown in red. The formation and evolution process of the jet is a process in which magnetic