PREDNASAJUCI / LECTURER :

Zurab Vashalomidze

(1) Astronomical Institute, Slovak Academy of Sciences,
059 60 Tatranská Lomnica

NAZOV / TITLE :

Flow Instability in Spicules

ABSTRAKT / ABSTRACT :

Hydrodynamic flows in the solar atmosphere can indeed be unstable, leading to various instabilities 
that play a crucial role in the behaviour and dynamics of solar plasma. These instabilities are responsible 
for processes such as energy dissipation, heating, and particle acceleration, which have significant 
implications for the Sun-Earth connection and space weather.
Spicules and mottles constitute the main features of the chromospheric jets. Spicules are hair-like, 
thin, cool and dense structures which appear in chromospheric lines at the solar limb, while mottles are 
their disk counterparts. While the formation mechanism of classical spicules is more or less understood 
due to rebound shocks, the formation of short-lived type II spicules is still a problem.
We aim to observe spatial transverse displacements in type II spicule in on-disk observations with resulting 
heating and development of turbulence in the jets, which can be seen as the disappearance of the structures 
in cool chromospheric lines and appearance in hotter lines as well as the enhanced nonthermal broadening of 
observed cold chromospheric lines.