| Name: | SUDHEER MISHRA |
| Affiliation: | INDIAN INSTITUTE OF ASTROPHYSICS, BANGALORE |
| Conference ID : | ASI2023_343 |
| Title : | Initiation of Quasi-Periodic Pulsation at the Base of Kink Unstable Jet |
| Authors : | Sudheer K. Mishra1, Kartika Sangal2, Pradeep Kayshap3, A.K. Srivastava2, P. Rajaguru1
1 IndianInstitute of Astrophysics, Koramangala, Bangalore-560034, India
2 Department of Physics, Indian Institute of Technology (BHU), Varanasi-221005, India
3 VIT Bhopal, Kothari Kalan, Sehore, Madhya-Pradesh 466114, India |
| Mode of Presentation: | Oral |
| Abstract Category : | Sun and the Solar System |
| Abstract : | Solar coronal jets are common and well-studied transients in the solar atmosphere, which may significantly contribute to maintaining the mass and energy of the overlying solar atmosphere. Magnetic reconnection and MHD instabilities may be the two possible mechanisms to trigger the coronal jet. In this talk, I will discuss the initiation and evolution of a kink unstable blowout jet using EUV AIA imaging and IRIS spectroscopic data. An inverse γ-shape flux-rope appears before the eruption of the jet, a morphological indication of the onset of kink instability. The lifting flux rope may reconnect with the overlying pre-existing coronal magnetic field or internally to trigger and for forming the blowout jet’s spire. Just after the launch, one leg of the flux rope erupts completely, while another leg has connected to the solar disk. During the eruptive phase of the jet, most of the plasma is ejected along this connected leg. The time-distance diagrams along the eruptive jet show multiple spikes or bright dots were resulting from periodic fluctuations, i.e., quasi-periodic fluctuations (QPPs). The wavelet analysis confirms that QPPs have a dominant period of ≈ 03 minutes. IRIS spectra obtained from the same region show the existence of broad & complex profiles and bi-directional flows in the jet, which confirm the onset of magnetic reconnection. Further, this periodic line-broadening and Emission Measure (EM) also show the same period of ≈ 03 minutes, which strongly supports that periodic magnetic reconnections trigger QPPs in this blowout jet. |
