A comparison between spicules in H α and CIV

We study the interaction of the chromosphere with the transition region by examining the properties of short-lived chromospheric jet-like features, that we will collectively call "spicular jets," at different heights and temperatures. Our observations cover the middle and upper chromosphere (Hor observations from the Swedish 1-meter Solar Telescope) and the low and upper transition region (C IV and Fe IX/X image sequences from the Transition Region and Coronal Explorer). We study C IV emission from these jets and its correlation to red-shifted H α, as well as the phase difference between locations of co-temporal wave-trains in Fe IX/X of 5-minute periodicity ("moss"). We find that some, but not all spicular jets show closely correlated C IV emission, indicating that these jets are heated, at least in part, to transition region temperatures. We also find that the moss oscillations are in phase on distances of less than 4″, suggesting that the driver mechanism is also in phase on a similar length scale.