A5043311317- Solar and Space Plasma Dynamics
- Astro and Planetary Science
- Stellar, planetary, and galactic studies
- Ionosphere and magnetosphere dynamics
- Geomagnetism and Paleomagnetism Studies
- Solar Radiation and Photovoltaics
- Geophysics and Gravity Measurements
- Astronomical Observations and Instrumentation
- Astronomy and Astrophysical Research
- Atmospheric Ozone and Climate
- Space exploration and regulation
- Magnetic confinement fusion research
- Planetary Science and Exploration
- Adaptive optics and wavefront sensing
- Global Energy and Sustainability Research
- Oil, Gas, and Environmental Issues
- Laser-Plasma Interactions and Diagnostics
- Currency Recognition and Detection
- Inertial Sensor and Navigation
- Scientific Research and Philosophical Inquiry
- Computational Physics and Python Applications
- Geophysical Methods and Applications
- Geophysics and Sensor Technology
- Image Processing Techniques and Applications
- Reservoir Engineering and Simulation Methods
Leibniz Institute for Astrophysics Potsdam
2019-2024
Academy of Athens
2017-2021
National Observatory of Athens
2008-2015
National and Kapodistrian University of Athens
2008-2011
Eugenides Hospital
2010
Athens State University
2006
Solar Orbiter is the first space mission observing solar plasma both in situ and remotely, from a close distance, out of ecliptic. The ultimate goal to understand how Sun produces controls heliosphere, filling System driving planetary environments. With six remote-sensing four in-situ instrument suites, coordination planning operations are essential address following top-level science questions: (1) What drives wind where does coronal magnetic field originate? (2) How do transients drive...
Aiming to assess the progress and current challenges on formidable problem of prediction solar energetic events since COSPAR/ International Living With a Star (ILWS) Roadmap paper Schrijver et al. (2015), we attempt an overview status global research efforts. By refer flares, coronal mass ejections (CMEs), particle (SEP) events. The emphasis, therefore, is methods flares eruptions, as well their associated SEP manifestations. This work complements COSPAR Space Weather Action Teams (ISWAT)...
The European Union funded the FLARECAST project, that ran from January 2015 until February 2018. had a research-to-operations (R2O) focus, and accordingly introduced several innovations into discipline of solar flare forecasting. were: first, treatment hundreds physical properties viewed as promising predictors on equal footing, extending multiple previous works; second, use fourteen (14) different machine learning techniques, also to optimize immense Big Data parameter space created by...
Context. Stellar flares cannot be spatially resolved, which complicates ascertaining the physical processes behind particular spectral signatures. Due to their proximity Earth, solar can serve as a stepping stone for understanding stellar counterparts, especially when using Sun-as-a-star instrument and in combination with resolved observations. Aims. We aim understand disk-integrated behaviors of confined X2.2 flare its eruptive X9.3 successor, had energies 2.2 × 10 31 erg 9.3 erg,...
Ubiquitous small-scale vortices have recently been found in the lower atmosphere of quiet Sun state-of-the-art solar observations and numerical simulations. We investigate characteristics temporal evolution a granular-scale vortex its associated upflows through photosphere chromosphere internetwork region. analyzed high spatial resolution ground- spaced-based The consist high-cadence time series wideband narrowband images both H-alpha 6563 A Ca II 8542 lines obtained with CRisp Imaging...
Context . Vortex flows have been extensively observed over a wide range of spatial and temporal scales in different spectral lines, thus layers the solar atmosphere, widely found numerical simulations. However, signatures vortex only recently reported wings H α , but never so far line centre. Aims We investigate appearance, characteristics, substructure, dynamics 1.7 h persistent flow from ground space quiet-Sun region several lines/channels covering all atmospheric photosphere up to low...
Aims. To investigate the role of acoustic and magneto-acoustic waves in heating solar chromosphere, observations strong chromospheric lines are analyzed by comparing deposited acoustic-energy flux with total integrated radiative losses. Methods. Quiet-Sun weak-plage regions were observed Ca II 854.2 nm H-alpha Fast Imaging Solar Spectrograph (FISS) at 1.6-m Goode Telescope (GST) on 2019 October 3 H-beta echelle spectrograph attached to Vacuum Tower (VTT) 2018 December 11 June 6. The energy...
The improved High-resolution Fast Imager (HiFI+) is a multiwavelength imaging filtergraph, which was commissioned at the GREGOR solar telescope Observatorio del Teide, Izaña, Tenerife, Spain, in March 2022 – followed by science verification April 2022, after it entered routine observations. Three camera control computers with two synchronized sCMOS and CMOS cameras each provide near diffraction-limited high cadence six wavelength bands (Ca ii H 396.8 nm, G-band 430.7 blue continuum 450.6...
<i>Context. <i/>We investigate the oscillatory behavior of quiet solar chromosphere and its discrete components in terms oscillation properties, i.e. network internetwork. For this purpose, we use a time series high resolution filtergrams at five wavelengths along profile, obtained by Dutch Open Telescope.<i>Aims. aim to gain insight on distribution power different period bands variation between Our spectral provides information vertical power, since line has both photospheric chromospheric...
Aims. Our aim is to gain a better understanding of the interaction between acoustic oscillations and small-scale magnetic fields Sun. To this end, we examine oscillatory properties network region their relation configuration chromosphere. We link spatial variation with parameters field. investigate effect canopy diverging flux tubes chromospheric on distribution power over internetwork.
Recently, the characteristics, and dynamics of a persistent 1.7 h vortex flow, resembling small-scale tornado, have been investigated with ground-base space-based observations for first time in Ha line centre. The flow showed significant substructure form several intermittent chromospheric swirls. We investigate oscillatory behaviour various physical parameters area, 2D wavelet analysis performed within area quiet-Sun region (for comparison), using same high spatial temporal resolution Ca II...
The H{\alpha} spectral line is a well-studied absorption revealing properties of the highly structured and dynamic solar chromosphere. Typical features with distinct signatures in include filaments prominences, bright active-region plages, superpenumbrae around sunspots, surges, flares, Ellerman bombs, filigree, mottles rosettes, among others. This study based on high-spectral resolution spectra obtained echelle spectrograph Vacuum Tower Telescope (VTT) located at Observatorio del Teide...
Context. We present evidence for the conversion and transmission of wave modes on magnetic flux tubes that constitute mottles form canopy in a quiet Sun region.
Context. Chromospheric swirls are related to convectively driven vortex flows and considered play a significant role in the dynamics heating of upper solar atmosphere. It is important automatically detect track them chromospheric observations determine their properties. Aims. We aim both space time by applying newly developed novel automated method on high quality series H α conduct statistical analysis Methods. applied recently swirl detection time-series quiet region chromosphere obtained...
Abstract We study the evolution of electric currents during emergence magnetic flux in solar photosphere and differences exhibited between active regions different Hale complexity classes. A sample 59 was analyzed using a method based on image segmentation error analysis to determine total amount nonneutralized current along their polarity inversion lines. The time series unsigned current, I NN,tot , exhibit intricate structure form distinct peaks valleys. This information is largely missing...