IRIS Movie of the Day
At least once a week a movie of the Sun taken by NASA's Interface Region Imaging Spectrograph (IRIS) is posted by one of the scientists operating the instrument.
A peculiar jet observed by IRIS over the limb
Credit: IRIS, LMSAL/NASA, Lijia Guo
During the coordinated campaign with SST, IRIS observed a jet close to the end of the observation sequence. The jet crossed the IRIS slit and produce interesting spectra at the Mg II h&k wavelength --- a large blue-shifted Doppler flow at the bottom of the jet and a moderate blue-shifted flow along the radial direction. The large blue-shifted flow is also visible in C II while barely visible in Si IV, suggesting that the jet contain most cold chromospheric plasma.