Hi-C 2.1 Observations of Jetlet-like Events at Edges of Solar Magnetic Network Lanes

We present high-resolution, high-cadence observations of six, fine-scale, on-disk jet-like events observed by the High-resolution Coronal Imager 2.1 (Hi-C 2.1) during its sounding-rocket flight. We combine the Hi-C 2.1 images with images from the Solar Dynamics Observatory (SDO)/Atmospheric Imaging...

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Bibliographic Details
Published in:Astrophysical journal. Letters 2019-12, Vol.887 (1), p.L8
Main Authors: Panesar, Navdeep K., Sterling, Alphonse C., Moore, Ronald L., Winebarger, Amy R., Tiwari, Sanjiv K., Savage, Sabrina L., Golub, Leon E., Rachmeler, Laurel A., Kobayashi, Ken, Brooks, David H., Cirtain, Jonathan W., Pontieu, Bart De, McKenzie, David E., Morton, Richard J., Peter, Hardi, Testa, Paola, Walsh, Robert W., Warren, Harry P.
Format: Article
Language:eng ; nor
Subjects:
Eruptions
Fluctuations
Flux
High resolution
Image resolution
Polarity
Quiet sun
Rocket flight
Solar activity
Solar chromosphere
Solar chromospheric heating
Solar magnetic fields
Solar observatories
The Sun
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Summary:We present high-resolution, high-cadence observations of six, fine-scale, on-disk jet-like events observed by the High-resolution Coronal Imager 2.1 (Hi-C 2.1) during its sounding-rocket flight. We combine the Hi-C 2.1 images with images from the Solar Dynamics Observatory (SDO)/Atmospheric Imaging Assembly (AIA) and the Interface Region Imaging Spectrograph (IRIS), and investigate each event's magnetic setting with co-aligned line-of-sight magnetograms from the SDO/Helioseismic and Magnetic Imager (HMI). We find that (i) all six events are jetlet-like (having apparent properties of jetlets), (ii) all six are rooted at edges of magnetic network lanes, (iii) four of the jetlet-like events stem from sites of flux cancelation between majority-polarity network flux and merging minority-polarity flux, and (iv) four of the jetlet-like events show brightenings at their bases reminiscent of the base brightenings in coronal jets. The average spire length of the six jetlet-like events (9000 3000 km) is three times shorter than that for IRIS jetlets (27,000 8000 km). While not ruling out other generation mechanisms, the observations suggest that at least four of these events may be miniature versions of both larger-scale coronal jets that are driven by minifilament eruptions and still-larger-scale solar eruptions that are driven by filament eruptions. Therefore, we propose that our Hi-C events are driven by the eruption of a tiny sheared-field flux rope, and that the flux rope field is built and triggered to erupt by flux cancelation.
ISSN:2041-8205
2041-8213
DOI:10.3847/2041-8213/ab594a