Magnetic topology of blowout jets

MANDRINI, C.H.; CRISTIANI, G.D.; JOSHI, B.; CHANDRA, R.; CREMADES, H.; SRIVASTAVA, A.; SCHMIEDER, B.; NUEVO, F.A.; UDDIN, W.

Simposio; IAU Symposium 327, Fine structure and dynamics of the solar atmosphere; 2016

A subclass of broad X-ray and EUV jets, called blowout jets, have recently become a topic of discussionsince they could be the link between standard collimated jets and coronal mass ejections (CMEs). This classcan present a violent flux-rope eruption at its base by which cool material at chromospheric or transitionregion temperatures is ejected in a narrow CME eruption. We analyze multi-wavelength observations ofa series of recurrent broad jets. In particular, one of these events occurred simultaneously with an M2.4flare. A local force-free model is the base to compute the active region topological structure. We findbald patches (BPs) at the flare site. The large-scale field lines, associated to the BPs, represent openloops. Following the brightest leading edge of the H↵ and EUV emission in the jet, we can temporarilyassociate the broad jet to the narrow CME. We find that this bald-patch topology is present for at leasttwo days before the flare and could also explain the occurrence of all the observed recurrent jets, whichwere also associated to narrow CMEs. Considering this association, the observed broad jets appear to beof the blowout class. We propose that magnetic reconnection could occur at the chromospheric level at theBP separatrices forced by the destabilization of a continuously reformed flux rope underlying them. Thereconnection process could bring the cool flux-rope material into the reconnected open field lines drivingthe series recurrent blowout jets and accompanying coronal eruptions. In particular, when enough energywas stored in the configuration, the eruption of the flux rope could result in an impulsive flare, as the oneobserved, and, as it happened in other events, the jet expulsion expanding in a narrow CME.