Speaker
Costas Alissandrakis
(University of Ioannina)
Description
IRIS observations of chromospheric and CCTR lines, with their unique spatial and
temporal capabilities, allow for a complete diagnostic of the highly dynamical
spicules from their cool roots to their expansion and disappearance into the corona.
We analyzed both spectral and slit-jaw observations near the south pole of the sun,
with the slit perpendicular to the limb. Here we will present the main
characteristics of the average Mg II (not only h and k but also the 3p-3d) line
profiles along with those of the CI, OI and Si IV lines and we compare with 1D
non-LTE modelling. We find that most profiles parameters are reproduced by the model,
except for the k/h ratio; we discuss this last issue in terms of velocity fields in
very fine (non resolved) structures. We will also present results on the spatial and
spectral time evolution during the ~ 1 hour long interval of observation.
Primary author
Costas Alissandrakis
(University of Ioannina)
