Spectro-imagery of an active tornado-like prominence: Formation and evolution Krzysztof Barczynski, Brigitte Schmieder, Aaron W. Peat, Nicolas Labrosse, Pierre Mein and Nicole Mein A&A, 653 (2021) A94 Published online: 15 September 2021 DOI: 10.1051/0004-6361/202140976