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* News 04/04/20 * The archive is using a new backend database. This has thrown up a few SQL errors in the last few days. If you have any issues please email adavey@nso.edu with either the number of eprint you are trying to edit or a link to your preprint.

Case study of multi-temperature coronal jets for emerging flux MHD models  

Reetika Joshi   Submitted: 2020-07-16 11:24

Hot coronal jets are a basic observed feature of the solar atmosphere whose physical origin is still actively debated. We study six recurrent jets that occurred in active region NOAA 12644 on April 4, 2017. They are observed in all the hot filters of AIA as well as cool surges in IRIS slit–jaw high spatial and temporal resolution images. The AIA filters allow us to study the temperature and the emission measure of the jets using the filter ratio method. We studied the pre-jet phases by analyzing the intensity oscillations at the base of the jets with the wavelet technique. A fine co-alignment of the AIA and IRIS data shows that the jets are initiated at the top of a canopy-like double-chambered structure with cool emission on one and hot emission on the other side. The hot jets are collimated in the hot temperature filters, have high velocities (250 km s-1) and are accompanied by cool surges and kernels that both move at 45 km s-1. In the pre-phase of the jets, we find quasi-periodic intensity oscillations at their base that are in phase with small ejections; they have a period of between 2 and 6 min, and are reminiscent of acoustic or magnetohydrodynamic waves. This series of jets and surges provides a good case study for testing the 2D and 3D magnetohydrodynamic emerging flux models. The double-chambered structure that is found in the observations corresponds to the regions with cold and hot loops that are in the models below the current sheet that contains the reconnection site. The cool surge with kernels is comparable with the cool ejection and plasmoids that naturally appear in the models.

Authors: Reetika Joshi, Ramesh Chandra, Brigitte Schmieder, Fernando Moreno-Insertis, Guillaume Aulanier, Daniel Nóbrega-Siverio, and Pooja Devi
Projects: None

Publication Status: Accepted
Last Modified: 2020-07-18 21:49
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Slippage of Jets Explained by the Magnetic Topology of NOAA Active Region 12035  

Reetika Joshi   Submitted: 2017-09-10 21:01

In this study, we present the investigation of eleven recurring solar jets originated from two different sites (site 1 and site 2) close to each other (~ 11 Mm) in the NOAA active region (AR) 12035 during 15-16 April 2014. The jets were observed by the Atmospheric Imaging Assembly (AIA) telescope onboard the Solar Dynamics Observatory (SDO) satellite. Two jets were observed by the Aryabhatta Research Institute of Observational Sciences (ARIES), Nainital, India telescope in Hα . On 15 April flux emergence is important in site 1 while on 16 April flux emergence and cancellation mechanisms are involved in both sites. The jets of both sites have parallel trajectories and move to the south with a speed between 100 and 360 km s-1. We observed some connection between the two sites with some transfer of brightening. The jets of site 2 occurred during the second day and have a tendency to move towards the jets of site 1 and merge with them. We conjecture that the slippage of the jets could be explained by the complex topology of the region with the presence of a few low-altitude null points and many quasi-separatrix layers (QSLs), which could intersect with one another.

Authors: R. Joshi, B. Schmieder, R. Chandra, G. Aulanier, F.P. Zuccarello, W. Uddin
Projects: None

Publication Status: Accepted for publication in Solar Physics
Last Modified: 2017-09-13 12:22
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Case study of multi-temperature coronal jets for emerging flux MHD models
Slippage of Jets Explained by the Magnetic Topology of NOAA Active Region 12035

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