Speaker
Gregal Vissers
(Institute of Theoretical Astrophysics, University of Oslo)
Description
Since the early days of the CRisp Imaging SpectroPolarimeter (CRISP) at the Swedish
1-m Solar Telescope (SST) the Halpha wing data of more active regions display
intermittent flows at apparent chromospheric canopy heights. These flows appear to be
aligned with canopy fibrils visible at the Halpha line core, with the blobs that
constitute these flocculent flows" seemingly moving from one footpoint to the other.
Their driving mechanism has been speculated to be a siphon flow, while their
morphology may be due to thermal instabilities (with single condensations formed much
the same way as in coronal rain). Here we present results from a study combining SST
observations in Halpha and Ca II 8542Å with Interface Region Imaging Spectrograph
(IRIS) rastering and slit-jaw imaging in C II, Si IV and Mg II. We investigate the
co-spatiality of signatures in the various diagnostics, quantify their statistical
properties and discuss possible formation mechanisms."
Primary author
Gregal Vissers
(Institute of Theoretical Astrophysics, University of Oslo)
