Top panel: Hα integrated intensity map of the tornado observed with the Meudon MSDP. The field of view is 70′′× 45′′. The dashed line approximately represents the limb. The two red arrows point out the double structure of the tornado at its top. Asteriks 1−3 are the selected pixels for showing examples of profiles. Bottom panel: Hα profiles: pixel 1 dashed line, pixel 2 solid line, and pixel 3 dotted line. The unit of the intensity is 10-6 erg s-1 cm-2 sr-1 Hz-1.
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