A5011018837- Solar and Space Plasma Dynamics
- Stellar, planetary, and galactic studies
- Ionosphere and magnetosphere dynamics
- Astro and Planetary Science
- Geophysics and Gravity Measurements
- History and Developments in Astronomy
- Geomagnetism and Paleomagnetism Studies
- Astronomical Observations and Instrumentation
- Gamma-ray bursts and supernovae
- Solar Radiation and Photovoltaics
- Flow Measurement and Analysis
- Structural Health Monitoring Techniques
- Historical and Architectural Studies
- Elasticity and Material Modeling
- Adaptive optics and wavefront sensing
- Space Exploration and Technology
- Historical Geography and Cartography
- Astrophysics and Star Formation Studies
- Calibration and Measurement Techniques
- Astrophysical Phenomena and Observations
- Atmospheric Ozone and Climate
- Astronomy and Astrophysical Research
- Historical Astronomy and Related Studies
- Laser-induced spectroscopy and plasma
- Cardiovascular Function and Risk Factors
University of Ljubljana
2014-2024
Czech Academy of Sciences, Astronomical Institute
2016-2024
Osservatorio Astrofisico di Torino
2018
Metis is the first solar coronagraph designed for a space mission capable of performing simultaneous imaging off-limb corona in both visible and UV light. The observations obtained with aboard Solar Orbiter ESA-NASA observatory will enable us to diagnose, unprecedented temporal coverage spatial resolution, structures dynamics full from 1.7 $R_\odot$ about 9 $R_\odot$. Due uniqueness profile, be able observe close vantage point (down 0.28 AU), achieving out-of-ecliptic views increase orbit...
We investigate the behavior of plasma in eruptive prominences and coronal mass ejections characteristic physical conditions. aim to demonstrate various relations between parameters radiation properties relevant Solar Orbiter Metis observations. Our method is based on 2D non-local thermodynamic equilibrium (non-LTE) modeling moving structures that are externally illuminated from solar disk. have focused temperatures below 10^5 K a range gas pressures opacity effects Lα line. Overall, we...
We report observations of a unique, large prominence eruption that was observed in the He II 304 {\AA} passband Extreme Ultraviolet Imager/Full Sun Imager telescope aboard Solar Orbiter on 15-16 February 2022. Observations from several vantage points (Solar Orbiter, Solar-Terrestrial Relations Observatory, and Heliospheric Earth-orbiting satellites) were used to measure kinematics erupting associated coronal mass ejection. Three-dimensional reconstruction calculate deprojected positions...
Context. Ultraviolet (UV) emission from coronal mass ejections can provide information on the evolution of plasma dynamics, temperature, and elemental composition, as demonstrated by UV Coronagraph Spectrometer (UVCS) board SOlar Heliospheric Observatory (SOHO). Metis, coronagraph Solar Orbiter, provides for first time coronagraphic imaging in H I Ly- α line and, simultaneously, polarized visible light, thus providing a host properties solar eruptions such their overall evolution, content,...
Context. The paper deals with the physics of erupting prominences in core coronal mass ejections (CME).
We investigated the off-limb spicules observed in Mg II h and k lines by IRIS a solar polar coronal hole. analyzed large dataset of obtained spectra to extract quantitative information about line intensities, shifts, widths. The profiles are broad double-peaked at lower altitudes, but flat-topped middle narrow single-peaked with largest Doppler shifts higher altitudes. use 1D non-LTE vertical slab models (i.e. which consider departures from Local Thermodynamic Equilibrium) single-slab...
On February 12, 2021 two subsequent eruptions occurred above the West limb, as seen along Sun-Earth line. The first event was a typical slow Coronal Mass Ejection (CME), followed $\sim 7$ hours later by smaller and collimated prominence eruption, originating Southward with respect to CME, plasma blob. These events were observed not only SOHO STEREO-A missions, but also suite of remote sensing instruments on-board Solar Orbiter (SolO). This work shows how data acquired Full Sun Imager (FSI),...
The plasma in cool cores of solar prominences is partially ionized and its ionization degree, general, depends on the actual kinetic temperature density ions considered. However, we demonstrate that under typical prominence conditions, dominant mechanism contributing to partial photoionization by radiation diffusing through plasma. This strongly illuminating from surrounding atmosphere. understanding thus requires a complex solution non-LTE radiative-transfer problem. In this paper, discuss...
Abstract The goal of this paper is to derive the physical conditions prominence observed on 2017 March 30. To do so, we use a unique set data in Mg ii lines obtained with space-borne Interface Region Imaging Spectrograph ( IRIS ) and H α line ground-based Multi-Channel Subtractive Double Pass spectrograph operating at Meudon solar tower. Here, analyze spectra h k lines, part which visible both sets lines. We compute grid 1D NLTE (i.e., departures from local thermodynamical equilibrium)...
Abstract We continued our investigation of the plasma characteristics a quiescent prominence that occurred on 2017 March 30. The was observed simultaneously by several instruments, including Interface Region Imaging Spectrograph (IRIS) and Multichannel Subtractive Double Pass (MSDP) spectrograph operating at Meudon solar tower. focused IRIS Mg ii h&k MSDP H α spectra, selecting 55 well-coaligned points within prominence. computed an extensive grid 63,000 isothermal isobaric 1D-slab...
This work deals with the study of an erupting prominence embedded in core a CME and focuses on derivation plasma filling factor. We explore two methods to measure factor that are based combination visible-light ultraviolet spectroscopic observations. Theoretical relationships for resonant scattering collisional excitation used evaluate intensity H I Lyman-{\alpha} Lyman-{\beta} lines, points where simultaneous cospatial LASCO-C2 UVCS data were available. Thermodynamic geometrical parameters...
Flare loops form an integral part of eruptive events, being detected in the range temperatures from X-rays down to cool chromospheric-like plasmas. While hot are routinely observed by Solar Dynamics Observatory's Atmospheric Imaging Assembly (SDO/AIA), seen off-limb rare. In this paper we employ unique observations SOL2017-09-10T16:06 X8.2-class flare which produced extended arcade loops. The Swedish 1-m Telescope (SST) made a series spectral images Ca II 8542 \r{A} and hydrogen H$\beta$...
The paper analyzes the structure and dynamics of a quiescent prominence that occurred on October 22, 2013. We aim to determine physical characteristics observed using MgII k h, CII (1334 1336 A), SiIV (1394 A) lines by IRIS. employed 1D non-LTE modeling assuming static isothermal-isobaric slabs. selected large grid models with realistic input parameters computed synthetic lines. method Scargle periodograms was used detect possible oscillations. analyzed 2160 points in five different sections...
Context. We study the physics of erupting prominences in core coronal mass ejections (CMEs) and present a continuation previous analysis.
Abstract The density distribution of flare loops and the mechanisms their emission in continuum are still open questions. On 2017 September 10, a prominent loop system appeared during gradual phase an X8.2 (SOL2017-09-10), visible all passbands SDO /AIA white-light /HMI. We investigate its electron by taking into account radiation processes loops, i.e., Thomson continuum, hydrogen Paschen Brackett recombination continua, as well free–free emission. derive quadratic function for given...
Abstract Metis, the space coronagraph on board Solar Orbiter, offers us new capabilities for studying eruptive prominences and coronal mass ejections (CMEs). Its two spectral channels, hydrogen L α visible light (VL), will provide first time coaligned cotemporal images to study dynamics plasma properties of CMEs. Moreover, with VL channel (580–640 nm) we find an exciting possibility detect helium D 3 line (587.73 its linear polarization. The aim this is predict diagnostic potential regarding...
Abstract Metis on board Solar Orbiter is the space coronagraph developed by an Italian–German–Czech consortium. It capable of observing solar corona and various coronal structures in visible-light (VL) UV (hydrogen Ly α ) channels simultaneously for first time. Here we present observations a large eruptive prominence 2021 April 25–26, VL, taken during mission cruise phase, demonstrate that apart from broadband continuum emission, which due to Thomson scattering electrons, detect significant...
We present an analysis of off-limb cool flare loops observed by SDO/AIA during the gradual phase SOL2017-09-10T16:06 X8.2-class flare. In EUV channels starting from 335 {\AA} one, appear as dark structures against bright loop arcade. These were precisely coaligned (spatially and temporally) with SST in emission lines hydrogen ionized calcium. Recently published semi-empirical model based on observations serves us to predict level helium recombination continua. The continua synthesized using...
In this paper we study the soft X-ray (SXR) signatures of one particular prominence. The observations used here were made by Hinode/X-Ray Telescope instrument using two different filters. Both them have a pronounced peak response function around 10 Å. One has secondary smaller 170 Å, which leads to contamination SXR images. observed darkening in both these filters very large vertical extension. position and shape correspond nicely with prominence structure seen SDO/AIA First, investigated...
Abstract Using the eclipse observations, we construct maps of quiescent prominence temperatures, electron densities, pressures and geometrical thicknesses. For this use RGB signal visible-light emission detected during total solar on August 1, 2008 in Mongolia, quasi-simultaneous Hα spectra taken at Ondřejov observatory. The method disentangling density effective thickness was described by Jejčič & Heinzel (2009) is used here for first time to analyse spatial variations various parameters.