A5056668551- Solar and Space Plasma Dynamics
- Stellar, planetary, and galactic studies
- Astro and Planetary Science
- Ionosphere and magnetosphere dynamics
- Solar Radiation and Photovoltaics
- Geomagnetism and Paleomagnetism Studies
- Spacecraft Design and Technology
- Solar Thermal and Photovoltaic Systems
- Gamma-ray bursts and supernovae
- Education, Psychology, and Social Research
- CCD and CMOS Imaging Sensors
- Calibration and Measurement Techniques
- Pharmaceutical Economics and Policy
- Planetary Science and Exploration
- Space Satellite Systems and Control
- Innovation Policy and R&D
- Satellite Communication Systems
- Health Systems, Economic Evaluations, Quality of Life
- Magnetic and Electromagnetic Effects
- Geophysics and Gravity Measurements
Space Research Institute
2022-2024
P.N. Lebedev Physical Institute of the Russian Academy of Sciences
2015-2022
Abstract Due to the increase in spatial and temporal resolution of observations solar atmosphere, which is mainly associated with progress space research, we now understand that Sun’s activity not only large centers, but also extends significantly smaller scales. Each new advance experimental technology over past 60 years has led discovery more numerous small structures: X-ray active regions 1960s, hot points 1970s, microflares 1980s, finally, from end 20th century, nanoflares. At same time,...
Macrospicules are relatively large spicule-like formations found mainly over the polar coronal holes when observing in transition region spectral lines. In this study, we took advantage of two short series observations He II 304 \r{A} line obtained by TESIS solar observatory with a cadence up to 3.5 s study dynamics macrospicules unprecedented detail. We used one-dimensional hydrodynamic method based on assumption their axial symmetry and simple radiative transfer model reconstruct evolution...
In 2017, the government of Ukraine introduced new Affordable Medicines Program (AMP) for outpatient prescription medicines reimbursement. Despite evident program implementation benefits, it is highly important to examine AMP framework reveal its current tendencies, strengths, and shortcomings that might be useful support further development improvement reimbursement models. This study aimed evaluate how pricing strategies applied by affect potential provide patients with affordable...
We present a description of the recent advances in development KORTES assembly—the first solar oriented mission designed for Russian segment International Space Station. consists several imaging and spectroscopic instruments collectively covering wide spectral range extending from extreme ultraviolet (EUV) wavelengths to X-rays. The EUV telescopes inside will trace origin dynamics various phenomena, e.g., flares, CMEs, eruptions etc. spectra provided by grazing-incidence spectroheliographs...
Macrospicules are typically described as solar jets that larger and longer-lived than spicules, visible mostly in transition-region spectral lines. They show a broad variation properties, which pose substantial difficulties for their identification, modelling, the understanding of role mass energy balance atmosphere. In this study, we focused on sub-population these undergo parabolic trajectories when observed He II 304 {\AA} line using high-cadence observations Atmospheric Imaging Assembly...
Investigations of solar activity require information about plasma in a wide range temperatures. Generally, researchers observations from telescopes producing monochromatic images coronal with cool, warm, and hot Until now, telescopic imaging has been made only the Mg XII 8.42 Å line spectroheliograph on board CORONAS-I, CORONAS-F, CORONAS-PHOTON satellites. The used Bragg crystal optics. Its design is based two main principles: (1) to select working wavelength such way that reflection occurs...
The paper analyzes the latitudinal distribution of high-temperature plasma (T>4 MK) and microflares on solar disk during low activity in 2009. A0.1–A1.0 contains belts typical ordinary flares B class higher. In total, we have registered 526 flares, most which, about 96 %, occurred at high latitudes. About 4 % were found near equator. We believe that they formed by residual magnetic field previous cycle 23. Ordinary almost not observed equator this period. number southern hemisphere was...
ARKA and KORTES are two upcoming solar space missions in extreme ultraviolet X-ray wavebands. is a sun-oriented mission designed for the Russian segment of International Space Station. consists several imaging spectroscopic instruments that will observe corona number wavebands, covering EUV ranges. The surveillance strategy to cover wide range observations including simultaneous imaging, polarization measurements. small satellite intended take highresolution images Sun at wavelengths. be...
Aims. We aim to improve the existing techniques probe nanoflare hypothesis for coronal heating problem. For this purpose, we propose using solar extreme ultraviolet (EUV) emission variability registered with modern space-based imagers. Methods. followed a novel model-based approach. As starting point, used EBTEL 0d hydrodynamic model. integrated arising system of stochastic differential equations calculate covariance matrix plasma parameters. then employed Taylor expansion technique relate...
The work is devoted to the analysis of possibility implementing measurements Earth's magnetic field on board small spacecraft CubeSat 1U format. In particular, problem ensuring purity for operation magnetometers as part nanosatellites was solved. required accuracy equipment estimated and recommended maximum level spacecraft's residual determined – 0.1 nT. Ensuring value background possible only if platform magnetometer are spaced apart - due a special boom. To estimate its minimum length,...
<title>Abstract</title> In this work, we describe the design and flight performance of REFOS instrument (from Russian REntgenovskiy FOto Spektrometr; in English "X-ray Photo Spectrometer"). is a soft X-ray spectrophotometer that registers full-disk integrated solar spectra (“Sun as star”). It operates on board Impulse-1 nanosatellite, which was launched 24 June 2023. has 1.2 – 30 keV spectral range, 0.123 nominal full width at half-maximum (FWHM) resolution 5.9 keV, cadence 16 s. We...
This paper describes in detail a compact (2U format) telescope operating the extreme ultraviolet range for studying solar corona at wavelength of 17.14 nm. The objective has been built according to Ritchey-Chrétien scheme with following parameters: effective focal length 381.3 mm, field view 2×2∘, and angular resolution 11 in. Reflective multilayer Al/Be coatings were used, having 55% reflectance 0.4 nm spectral bandwidth. wavefront rms error is 30 An interferometric technique controlling...
In the solar corona, magnetic reconnection occurs due to finite resistivity of plasma. At same time, leads ohmic heating. Therefore, reconnecting current sheet should heat surrounding This paper presents experimental evidence such plasma heating caused by reconnection. We observed effect during a C1.4 flare on 16 February 2003 at active region NOAA 10278, near limb. Thanks location, we successfully identified all principal elements flare: arcade, fluxrope, and, most importantly, presumed...
We use high-cadence observations in the He ii 304 Å line and a simple one-dimensional hydrodynamic model to reconstruct evolution of velocity field 18 macrospicules. Besides, we study motions their apparent summits find them follow parabolic trajectories, which correspond closely obtained field. The trajectory decelerations typically range from 140 240 m/s2, initial velocities 80 145 km/s. Moreover, clear linear dependence between these two values. estimate that 10 30% macrospicule's...