Origin of Quasi-Periodic Pulsation at the Base of Kink Unstable Jet
arXiv:2301.01534 · doi:10.3847/1538-4357/acb058
Abstract
We study a blowout jet that occurs at the west limb of the Sun on August 29, 2014 using high-resolution imaging/spectroscopic observations provided by SDO/AIA and IRIS. An inverse -shape flux-rope appears before the jet{--} morphological indication of the onset of kink instability. The twisted field lines of kink-unstable flux-rope reconnect at its bright knot and launch the blowout jet at 06:30:43 UT with an average speed of 234 km s. Just after the launch, the northern leg of the flux rope erupts completely. The time-distance diagrams show multiple spikes or bright dots, which is the result of periodic fluctuations, i.e., quasi-periodic fluctuations (QPPs). The wavelet analysis confirms that QPPs have a dominant period of 03 minutes. IRIS spectra (Si~{\sc iv}, C~{\sc ii}, and Mg~{\sc ii}) may also indicate the occurrence of magnetic reconnection through existence of broad complex profiles and bi-directional flows in the jet. Further, we have found that line broadening is periodic with a period of 03 minutes, and plasma upflow is always occurs when the line width is high, i.e., multiple reconnection may produce periodic line broadening. The EM curves also show the same period of 03 minutes in different temperature bins. The images and EM show that this jets spire is mainly cool (chromospheric/transition region) rather than hot (coronal) material. Further, line broadening, intensity, and EM curves have a period of 03 minutes, which strongly supports that multiple magnetic reconnection triggers QPPs in the blowout jet.
arXiv commentThe Astrophysical Journal (In press), 25 pages, 12 figures
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