Frequently Occurring Reconnection Jets from Sunspot Light Bridges

Yurchyshyn, Vasyl; Peter, Hardi; Solanki, S. K.; Young, Peter R.; Ni, Lei; Cao, Wenda; Ji, Kaifan; Zhu, Yafen; Zhang, Jingwen; Samanta, Tanmoy; Song, Yongliang; He, Jie; Wang, Linghua; Chen, Yajie

doi:10.3847/1538-4357/aaa89d

Cited by 99 publications

(120 citation statements)

References 126 publications

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“…Moreover, it reveals an inverted "Y"-shape structure at the footpoint, which is believed to result from magnetic reconnection between small magnetic bipoles and unipolar background fields (Shibata et al 2007). Similar structures have also been identified from other high-resolution observations of EBs (Watanabe et al 2011;Tian et al 2016;Tian et al 2018b). Similar to the first event, the associated UV burst is located at the top of the flame-like EB, and intensities of the EB and UV burst show correlated variations.…”

Section: Resultssupporting

confidence: 85%

Flame-like Ellerman Bombs and Their Connection to Solar Ultraviolet Bursts

Chen

Peter

Samanta

et al. 2019

ApJL

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Ellerman bombs (EBs) are small-scale intense brightenings in Hα wing images, which are generally believed to be signatures of magnetic reconnection around the temperature minimum region of the solar atmosphere. They have a flame-like morphology when observed near the solar limb. Recent observations from the Interface Region Imaging Spectrograph (IRIS) reveal another type of small-scale reconnection events, termed UV bursts, in the lower solar atmosphere. Though previous observations have shown a clear coincidence of some UV bursts and EBs, the exact relationship between these two phenomena is still under debate. We investigate the spatial and temporal relationship between flame-like EBs and UV bursts using joint near-limb observations between the 1.6-meter Goode Solar Telescope (GST) and IRIS. In total 161 EBs have been identified from the GST observations, and ∼20 of them reveal signatures of UV bursts in the IRIS images. Interestingly, we find that these UV bursts have a tendency to appear at the upper parts of their associated flame-like EBs. The intensity variations of most EB-related UV bursts and their corresponding EBs match well. Our results suggest that some of these UV bursts and EBs are likely formed at different heights during a common reconnection process.

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Section: Resultssupporting

confidence: 85%

Flame-like Ellerman Bombs and Their Connection to Solar Ultraviolet Bursts

Chen

Peter

Samanta

et al. 2019

ApJL

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“…These observational characteristics also support that the fan shape jets are caused by the magnetic reconnection. Note however that the absorption features observed here are not akin to the one discussed by Tian et al (2018). In their paper, significant line broadening of the Si iv, C ii and Mg ii h&k lines are found and the Mg h&k lines show strong absorption due to large opacity.…”

Section: Analysis and Resultssupporting

confidence: 47%

“…The length of the fan shape jets analysed here is about 4 Mm, in the range of the classification of the magnetic reconnection caused jets from Tian et al (2018).…”

Section: Summary and Discussionmentioning

confidence: 80%

“…We also find absorption structures of Ne ii 1393.33 and 1335.2Å superimposed on the lines of Si iv 1393.76Å and C ii 1335Å especially for P5 (green line) with a higher emission. The appearance of the absorption features in enhanced TR spectral profiles is an indication of a hot reconnection region below the dense and cold plasma Tian et al 2018). We also checked the Hα images at -0.8Å from the line center and found that there is intermittent intensity enhancements at the same time.…”

Section: Analysis and Resultsmentioning

confidence: 93%

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Signatures of Magnetic Reconnection at the Footpoints of Fan-shaped Jets on a Light Bridge Driven by Photospheric Convective Motions

Bai

Socas‐Navarro

Nóbrega-Siverio

et al. 2019

ApJ

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Dynamical jets are generally found on Light bridges (LBs), which are key to studying sunspots decays. So far, their formation mechanism is not fully understood. In this paper, we used state-of-the-art observations from the Goode Solar Telescope, the Interface Region Imaging Spectrograph, the Spectro-Polarimeter on board Hinode and the Atmospheric Imaging Assembly (AIA) on board the Solar Dynamics Observatory to analyze the fan shape jets on LBs in detail. Continuous upward motion of the jets in ascending phase is found from the Hα velocity, which lasts for 12 minutes and is associated with the Hα line wing enhancements.Two mini jets appear upon the bright fronts of the fan shape jets visible in the AIA 171Å and 193Å channels, with a time interval as short as 1 minute. Two kinds of small scale convective motions are identified in the photospheric images, along with the Hα line wing enhancements. One seems to be associated with the formation of a new convection cell and the other manifests as the motion of a dark lane passing through the convection cell. The finding of three lobes Stokes V profiles and their inversion with NICOLE code indicates that there is magnetic field lines with opposite polarities in LBs. From the Hα -0.8Å images, we found ribbon like brightenings propagating along the LBs, possibly indicating slipping reconnection. Our observation supports that the fan shape jets under study are caused by the magnetic reconnection and photospheric convective motions play an important role in triggering the magnetic reconnection.

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“…Additionally, we find that the number of detected EEs with only red wing enhancement is smaller than those with only blue wing enhancement (see Table 1). These results may be understood in a scenario of magnetic reconnection between emerging magnetic bipoles and overlaying magnetic fields, which produces small-scale jets in the chromosphere and TR (e.g., Shibata et al 2007;Moore et al 2011;Yurchyshyn et al 2013;Tian et al 2018). In such a scenario the downflow regions are located around the footpoints of the jets, while the upflow regions can extend longer along the jets.…”

Section: Ees On Network Jetsmentioning

confidence: 99%

Investigating the Transition Region Explosive Events and Their Relationship to Network Jets

Chen

Tian

Huang

et al. 2019

ApJ

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Recent imaging observations with the Interface Region Imaging Spectrograp (IRIS) have revealed prevalent intermittent jets with apparent speeds of 80-250 km s −1 from the network lanes in the solar transition region (TR). On the other hand, spectroscopic observations of the TR lines have revealed the frequent presence of highly non-Gaussian line profiles with enhanced emission at the line wings, often referred as explosive events (EEs). Using simultaneous imaging and spectroscopic observations from IRIS, we investigate the relationship between EEs and network jets. We first identify EEs from the Si iv 1393.755Å line profiles in our observations, then examine related features in the 1330Å slit-jaw images. Our analysis suggests that EEs with double peaks or enhancements in both wings appear to be located at either the footpoints of network jets, or transient compact brightenings. These EEs are most likely produced by magnetic reconnection. We also find that EEs with enhancements only at the blue wing are mainly located on network jets, away from the footpoints. These EEs clearly result from the superposition of the high-speed network jets on the TR background. In addition, EEs showing enhancement only at the red wing of the line are often located around the jet footpoints, possibly caused by the superposition of reconnection downflows on the background emission. Moreover, we find some network jets that are not associated with any detectable EEs. Our analysis suggests that some EEs are related to the birth or propagation of network jets, and that others are not connected to network jets.

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Frequently Occurring Reconnection Jets from Sunspot Light Bridges

Cited by 99 publications

References 126 publications

Flame-like Ellerman Bombs and Their Connection to Solar Ultraviolet Bursts

Flame-like Ellerman Bombs and Their Connection to Solar Ultraviolet Bursts

Signatures of Magnetic Reconnection at the Footpoints of Fan-shaped Jets on a Light Bridge Driven by Photospheric Convective Motions

Investigating the Transition Region Explosive Events and Their Relationship to Network Jets

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