Conveners
Poster Session 9.1
- Francesca Zuccarello (Istituto Nazionale di Astrofisica (INAF))
We explore the dynamical impacts and observable signatures of
two-fluid effects in the parameter regimes when ion-neutral collisions do not fully couple the neutral and charged fluids.
Popescu Braileanu et al., A&A (2021a,b): doi.org/10.1051/0004-6361/202039053 ; doi.org/10.1051/0004-6361/202140425
We performed 2.5D two-fluid simulations of the Rayleigh-Taylor instability (RTI) at a...
Shocks are regularly observed in the lower solar atmosphere, for example, umbral flashes which have average lifetimes of roughly a minute. For ideal magnetohydrodynamic (MHD) theory, slow-mode shocks should become unstable to the corrugation instability, triggered by the inhomogeneities in the solar atmosphere. However, the lower solar atmosphere is partially ionised, and the presence of a...
The Solar X-ray Monitor (XSM) onboard the Chandrayaan-2 mission carries out spectroscopic observations of the Sun in the energy range 1-15 keV with a resolution of 180 eV (at 5.9 keV). Here, we present an overview of results from XSM observation of the Sun during the 2019–2020 solar minimum, considered to be the quietest solar minimum of the past hundred years. These observations provide a...
Sunspots consist of a dark umbra and a brighter penumbra. Both regions exhibit magnetoconvection, manifested in penumbral filaments in the penumbra and in umbral dots in the umbra. The origin of the sharp transition from the umbra to the penumbra is unclear.
Here we investigate how the properties of individual convective cells vary across the umbra-penumbra boundary using spectropolarimetric...
By means of numerical simulations we present a new insight into the propagation of waves in a magnetic arcade embedded in the solar atmosphere and impact of the latter on the observed wave-periods. We consider a 2D approximation of the gravitationally stratified and partially-ionized lower solar atmosphere consisting of ion + electron and neutral fluids that are coupled by ion-neutral...
The magnetic reconnection occurs between two magnetic emerging flux (EMF) in a bald patch region observed in HMI vector magnetograms. A transfer of twist was operating between a neighboring flux rope to the jet through the BP.
A spatio-temporal analysis of IRIS spectra of Mg II, C II, and Si IV ions allows us to study the dynamics and the stratification of the flare atmosphere along the...
