Tornado with an interesting magnetic field structure, seemingly creating a void of gases at the ends of multiple twisty "fingers".
From SDO AIA @ 171 and 193 Angstroms, 2011-03-11 1700 - 2358 UT. Exported from JHelioviewer (http://jhelioviewer.org/)
Courtesy of NASA/SDO and the AIA, EVE, and HMI science teams