|The image on the right shows the general location of the X-shaped feature. This geometry calls to mind 2D pictures of magnetic reconnection at a neutral point. Here the left branch has a cusp pointing to the west, generally in the direction of the local vertical; the right branch would have a cusp (however) pointing to the east, which means that it is highly inclined. Probably both cusped loops have large inclinations and are low-lying.|
which shows some of the dynamics. In particular it appears that the right cusp element (idealizing the geometry as an X for which the left and right sides don't quite meet) actually exhibits flows along its length, from south to north. This suggests that the "re-formation" of NS interconnecting loops, a term often used by Z. Svestka, might result from siphon flow or "evaporation" along basically stable magnetic structures. The "re-formation" would then be interpreted as a "re-illumination."
The initial frame shows some of the flare, plus a lot of the saturation and other systematic effects in the SXT detector that we don't normally make public. Note the time jump. On the day after the flare, the cusp appears, and it grows to the E in the usual pattern. This seems like a textbook case of post-flare loop formation following a CME eruption, with the remark here that the CME must therefore have involved the entire heliospheric current sheet, as one frequently observes in the LASCO data.
Note added in proof: today (May 14) this NS interconnecting structure has been developing interestingly. Glad we've been watching it!
Well (note added 5/17), the story did continue interestingly. Below
is a difference image comparing May 15 (black) with May 17 (white), on
a slightly exaggerated color display. It shows that, sure enough, the W
limb did light up as the interconnecting loops re-formed beautifully!