Magnetic topology of blowout jets

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

Cartagena de Indias

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 discussion since they could be the link between standard collimated jets and coronal mass ejections (CMEs). This class can present a violent flux-rope eruption at its base by which cool material at chromospheric or transition region temperatures is ejected in a narrow CME eruption. We analyze multi-wavelength observations of a series of recurrent broad jets. In particular, one of these events occurred simultaneously with an M2.4 flare. A local force-free model is the base to compute the active region topological structure. We find bald patches (BPs) at the flare site. The large-scale field lines, associated to the BPs, represent open loops. Following the brightest leading edge of the Halpha and EUV emission in the jet, we can temporarily associate the broad jet to the narrow CME. We find that this bald-patch topology is present for at least two days before the flare and could also explain the occurrence of all the observed recurrent jets, which were also associated to narrow CMEs. Considering this association, the observed broad jets appear to be of the blowout class. We propose that magnetic reconnection could occur at the chromospheric level at the BP separatrices forced by the destabilization of a continuously reformed flux rope underlying them. The reconnection process could bring the cool flux-rope material into the reconnected open field lines driving the series recurrent blowout jets and accompanying coronal eruptions. In particular, when enough energy was stored in the configuration, the eruption of the flux rope could result in an impulsive flare, as the one observed, and, as it happened in other events, the jet expulsion expanding in a narrow CME.