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Two Solar Tornadoes Observed with IRIS

29 Nov 2018, 00:58 UTC
Two Solar Tornadoes Observed with IRIS
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Zihao Yang is an undergraduate from the School of Earth and Space Sciences at Peking University (PKU) in China. He is currently a senior and is majoring in space physics with an emphasis on solar and stellar physics. He conducted this undergraduate research project at Peking University under the supervision of Dr. Hui Tian. This work has been published on ApJ (open access on arXiv) and was also presented at the COSPAR 2018 meeting. Zihao’s personal website is https://zihaoyang-96.github.io/. Solar prominences are filaments of plasma that extend from the surface of the Sun to its outer atmosphere. The ‘barbs’ or ‘legs’ of some of these prominences, which appear to be rotating, are often termed solar tornadoes. It is under debate whether the apparent motion of solar tornadoes is a real rotating motion, or whether it is caused by oscillations or counter-streaming flows.To address this question, we analyzed results from spectroscopic observations of two solar tornadoes by the Interface Region Imaging Spectrograph (IRIS). We observed each tornado for more than 2.5 hours, and derived Doppler velocities using Mg II and Si IV emission lines. We find coherent and stable redshifts and blueshifts adjacent to each other on either side of the ...

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