Formation of a rotating jet during the filament eruption on 2013 April 10–11

Abstract

We analyze multi-wavelength and multi-viewpoint observations of a helically twisted plasma jet formed during a confined filament eruption on 10-11 April 2013. Given a rather large scale event with its high spatial and temporal resolution observations, it allows us to clearly understand some new physical details about the formation and triggering mechanism of twisting jet. We identify a pre-existing flux rope associated with a sinistral filament, which was observed several days before the event. The confined eruption of the filament within a null point topology, also known as an Eiffel tower (or inverted-Y) magnetic field configuration results in the formation of a twisted jet after the magnetic reconnection near a null point. The sign of helicity in the jet is found to be the same as that of the sign of helicity in the filament. Untwisting motion of the reconnected magnetic field lines gives rise to the accelerating plasma along the jet axis. The event clearly shows the twist injection from the pre-eruptive magnetic field to the jet.

Three-Dimensional Simulations of Tearing and Intermittency in Coronal Jets

“…Once the flux ropes were ejected, new ones formed in their place, and the process was repeated as the jet proceeded. This repeated formation and ejection of plasma blobs provides a natural explanation for the intermittent outflows, bright blobs of emission, and quasiperiodic intensity fluctuations observed in some jets (e.g., Singh et al 2011Singh et al , 2012Morton et al 2012;Zhang & Ji 2014;Filippov et al 2015). The thread-like nature of the tearingmediated outflows may also explain the filamentary structure often observed in jets (e.g., Singh et al 2011;Cheung et al 2015).…”

“…Such models implicitly assume that reconnection is occurring at one or more 3D magnetic nulls, so we conclude that this repeated tearing process is likely to occur in all coronal jets. Our schematic Figure 9 of this repeated process in a generic jet scenario could arise due to flux emergence (e.g., Moreno-Insertis & Galsgaard 2013), eruption of a minifilament (e.g., Filippov et al 2015;Sterling et al 2015), or instability following photospheric twisting (Pariat et al 2009). As the spatial resolution and temporal cadence of observing instruments increase, it seems inevitable that such structures will be detected increasingly frequently.…”

“…Recent Interface Region Imaging Spectrograph (IRIS) observations of an active-region jet revealed filamentary fine-scale structure in the emission from the reconnection region (Cheung et al 2015). Solar Dynamics Observatory observations have shown blobs forming in both small (Zhang & Ji 2014) and large (Filippov et al 2015) open-field EUV jets. Recent Solar TErrestrial RElations Observatory observations have also revealed trains of plasma blobs within jets in the closed-field corona near active regions (Zhang et al 2016).…”

3He-rich Solar Energetic Particles in Helical Jets on the Sun

“…The filament in event 3 appears to be faint. A small filament of cool (T ∼0.01-0.10 MK) plasma has been often observed in blowout jets (Moore et al 2010;Hong et al 2011;Shen et al 2012;Filippov et al 2015). Figure 6 shows the evolution of the EUV jets in highcadence 171Å images.…”

How Rotating Solar Atmospheric Jets Become Kelvin–Helmholtz Unstable

“…Type II spicules, according to De Pontieu et al (2012) and Martínez-Sykora et al (2013), along with the coronal hole EUV jets (Nisticò et al, 2009;Liu et al, 2009;Nisticò et al, 2010;Shen et al, 2011;Chen, Zhang, and Ma, 2012;Hong et al, 2013;Young and Muglach, 2014a,b;Moore, Sterling, and Falconer, 2015), and X-ray jets (Moore et al, 2013), can rotate, too. Rotating EUV jet emerging from a swirling flare (Zhang and Ji, 2014) or formed during a confined filament eruption (Filippov et al, 2015) confirm once again the circumstance that the rotational motion is a common property of many kinds of jets in the solar atmosphere.…”