SH53D-05:
Homologous Helical Jets: Observations by IRIS, SDO and Hinode and Data-Driven Simulations
Friday, 19 December 2014: 2:40 PM
Chun Ming Mark Cheung1, Bart De Pontieu1, Theodore D Tarbell1 and Yixing Fu2, (1)Lockheed Martin Solar and Astrophysics Laboratory, Palo Alto, CA, United States, (2)University of California Berkeley, Berkeley, CA, United States
Abstract:
We report on observations of recurrent jets by instruments onboard the Interface Region Imaging Spectrograph (IRIS), Solar Dynamics Observatory (SDO) and Hinode spacecrafts. Over a 4-hour period on July 21st 2013, recurrent coronal jets were observed to emanate from NOAA Active Region 11793. In more than one instance, double-peaked FUV spectra probing plasma at transition region temperatures show evidence of oppositely directed (Doppler) outflows exceeding +/- 100 km/s. Raster Doppler maps using a Si IV transition region line shows all four jets to have helical motion of the same sense. Time-dependent data-driven simulations are used to investigate the underlying drivers for the jets. These numerical experiments show that the emergence of current-carrying magnetic field in the vicinity of a pore supplies the magnetic twist needed for recurrent helical jet formation.
