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Fig. 4


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 13 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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