A5090959140- Solar and Space Plasma Dynamics
- Ionosphere and magnetosphere dynamics
- Astro and Planetary Science
- Gamma-ray bursts and supernovae
- Geomagnetism and Paleomagnetism Studies
- Solar Radiation and Photovoltaics
- Stellar, planetary, and galactic studies
- Geophysics and Gravity Measurements
- Earthquake Detection and Analysis
- Atmospheric Ozone and Climate
- Astrophysics and Cosmic Phenomena
- Magnetic confinement fusion research
- Space exploration and regulation
- Radiation Therapy and Dosimetry
- Spacecraft Design and Technology
- Electron and X-Ray Spectroscopy Techniques
- Space Satellite Systems and Control
- Plasma Diagnostics and Applications
- Energy and Environmental Sustainability
- Nuclear Physics and Applications
- Radiation Detection and Scintillator Technologies
- Global Energy and Sustainability Research
- Oil, Gas, and Environmental Issues
- Currency Recognition and Detection
- Statistical and numerical algorithms
Institute of Astronomy and National Astronomical Observatory
2020-2024
Bulgarian Academy of Sciences
2015-2023
Kumaun University
2023
Space Research and Technology Institute
2015-2019
Institute of Radio Astronomy
2017
Institute of Applied Astronomy
2017
Universidade Presbiteriana Mackenzie
2015
National Observatory of Athens
2015
St Petersburg University
2015
Institute of Physics
2015
SEPServer is a three-year collaborative project funded by the seventh framework programme (FP7-SPACE) of European Union. The objective to provide access state-of-the-art observations and analysis tools for scientific community on solar energetic particle (SEP) events related electromagnetic (EM) emissions. will eventually lead better understanding acceleration transport processes at Sun in inner heliosphere. These SEP that form one key elements space weather. In this paper we present first...
We present a statistical study on the observed solar radio burst emission associated with origin of in situ detected energetic particles. Several proton event catalogs period 1996–2016 are used. At time appearance particle (flare and coronal mass ejection) we identified signatures types II, III IV by inspecting dynamic spectral plots. The information from observatory reports is also accounted for during analysis. occurrence evaluated within selected wavelength ranges cycle 23 ongoing 24....
The study presents a concise overview on the main effects satellites due to space weather drivers compared well-known interplanetary, magnetospheric and ground-based consequences. solar-activity-driven influences include specific physics-based spacecraft surface on-board electronics electromagnetic emission energetic particles as well complex geomagnetic storms which may endanger mission performance longevity. We select test examples Starlink in period 2019–2022 present temporal...
The focus of this study is on solar proton events detected by the SOHO/ERNE instrument during cycles (SC) 23 and 24. We select output produced first channel high energy detector or at about 15 MeV. This report presents distributions onset-to-peak fluences, in terms their strength, location origin mutual correlations, well as SC trends.
The current paper explores the possibility of implementing a shortened monopole antenna for purposes radio reception broadband emission from Sun in low portion very high frequency (VHF) band. range interest is lowest band starting top (HF) spectrum near 20~MHz and extending to 65~MHz. In this waves penetrate ionosphere observation solar activities feasible. proposed broadband, un-tuned, receive-only suitable bands where background noise high, such as VHF exhibits numerous advantages over...
The dynamic behavior of solar prominences and filaments is a preursor to coronal mass ejections (CMEs), which can disrupt Earth's magnetosphere affect satellite communications. Systematic ground-based observations, conducted with high temporal resolution, are instrumental in monitoring these structures. Analysis the morphological changes destabilization processes captured datasets help identify early warning signs potential eruptions. This capability vital for developing reliable space...
Low states light curves of VY Scl type systems show rises with amplitudes 35 mag. Despite the accepted belief that this star does not exhibit outbursts similar to dwarf novae (DNe) one, their amplitudes, shapes and periods are DNe same orbital periods. MV Lyr, TT Ari KR Aur periodicities in range 200-400 d, but second maximum power spectra also occurs around 850-1000 d.The estimation change mass loss via coronal ejections during solar activity cycle can vary more than 5 times. The red dwarfs...
A comprehensive statistical analysis on the properties and accompanied phenomena of all M-class solar flares (as measured in soft X-rays) last two cycles (1996–2019) is presented here with a focus their space weather potential. The information about parent active region underlying sunspot (Hale) type collected for each case, where possible, order to identify photospheric precondition as precursors flare eruption or confinement. Associations coronal mass ejections, energetic particles,...
This paper presents the project Comprehensive spAce wEather Studies for ASPIS prototype Realization (CAESAR), which aims to tackle relevant aspects of Space Weather (SWE) science and develop a scientific data centre Italian Agency (ASI) called (ASI SPace InfraStructure). To this end, CAESAR involves majority SWE community, bringing together 10 institutions as partners, total 92 researchers. The approach encompasses whole chain phenomena from Sun Earth up planetary environments in...
We present a comprehensive catalog of geomagnetic storms (GSs) with Dst index ≤−50 nT detected during solar cycles (SCs) 23 and 24 (1996–2019). About 550 events were identified in the Kyoto database used as starting point for this study. The origin GSs, terms coronal mass ejections (CMEs), flares (SFs), situ-observed energetic particles, was where possible using temporal constraints wide Earth-directed ejecta. In addition, any accompanied interplanetary (IP) sources, such ICMEs IP shock...
The solar corona between below 10 radii is an important region for early acceleration and transport of energetic particles (SEPs) by coronal mass ejection-driven shock waves. There, these waves propagate into a highly variable dynamic medium with steep gradients rapidly expanding magnetic fields, which modulates the particle near shock/wave surfaces, way SEPs spread heliosphere. We present study modeling in global events corona, as well their to 1 au, based on telescopic observations coupled...
The first comprehensive analysis between the in situ detected solar energetic electrons (SEEs) from ACE/EPAM satellite and remotely observed radio signatures cycles (SCs) 23 24 (1997–2019) is presented. identified origin of SEEs (in terms flares, SFs, coronal mass ejections, CMEs) associated with emission types II, III IV, where possible. Occurrence rates are calculated as a function wavelength, low corona to interplanetary space near Earth. tendencies different burst appearances respect SC,...
The study presents the compilation of a comprehensive catalog solar energetic protons (SEPs) in cycles (SCs) 23 and 24 (1996–2019) 10 energy channels from about 20 to 100 MeV based on data Energetic Relativistic Nuclei Electron (ERNE) instrument aboard Solar Heliospheric Observatory (SOHO). For comparison, we added previously reported SEP fluxes by number different sources. We identified SEP-solar origin terms flares coronal mass ejections calculated statistical correlations (Pearson...
We present the association rates between solar energetic particles (SEPs) and radio emission signatures in corona IP space during entire cycle 23. selected SEPs associated with X M-class flares from visible hemisphere. All SEP events are also accompanied by coronal mass ejections. Here, we focus on correlation appearance of type II, III IV bursts dynamic spectra. For this used available data ground-based stations Wind/WAVES spacecraft. The associations presented separately for accompanying...
ABSTRACT We present the first comprehensive catalogue of in situ observed solar energetic electron (SEE) events that covers cycles [SCs] 23 and 24 energy range 103–315 keV. The enhancements are detected by Electron, Proton, Alpha Monitor − Deflected Electrons instrument [EPAM-DE] aboard ACE spacecraft. Onset time, peak background-subtracted intensity, onset-to-peak fluence have been analysed for each event where possible. describe utilized procedure to identify criteria their association...
Context.In the solar corona, shock waves are generated by flares and/or coronal mass ejections. They able to accelerate electrons up high energies and can thus be observed as type II bursts in nonthermal radio radiation. In-situ measurements of interplanetary space have shown that attached whistler preferably accompanied production energetic electrons.