Observation and modelling of the Fe XXI line profile observed by IRIS during the impulsive phase of flares

Vanessa Polito, Bay Area Environmental Research Institue, Moffett Field, United States, Paola Testa, Harvard-Smithsonian Center for Astrophysics, Cambridge, MA, United States, Bart De Pontieu, Lockheed Martin Solar and Astrophysics Laboratory, Palo Alto, CA, United States and Joel C Allred, NASA Goddard Space Flight Center, Greenbelt, MD, United States