A5036076449- Solar and Space Plasma Dynamics
- Ionosphere and magnetosphere dynamics
- Astro and Planetary Science
- Geomagnetism and Paleomagnetism Studies
- Geophysics and Gravity Measurements
- Stellar, planetary, and galactic studies
- Earthquake Detection and Analysis
- Solar Radiation and Photovoltaics
- Oil, Gas, and Environmental Issues
- Gamma-ray bursts and supernovae
- Astrophysics and Cosmic Phenomena
- Atmospheric Ozone and Climate
- Planetary Science and Exploration
- Space Satellite Systems and Control
- Vibration and Dynamic Analysis
- Inertial Sensor and Navigation
- Meteorological Phenomena and Simulations
- Energy and Environmental Sustainability
- Radiation Therapy and Dosimetry
- Economic and Technological Developments in Russia
- Solid-state spectroscopy and crystallography
- Statistical and numerical algorithms
- Mining and Gasification Technologies
- Electromagnetic Compatibility and Measurements
- Synthetic Aperture Radar (SAR) Applications and Techniques
Institute of Solar-Terrestrial Physics
2015-2024
Irkutsk State University
2017-2019
Siberian Branch of the Russian Academy of Sciences
2008-2014
Russian Academy of Sciences
2009-2012
Abstract We report on the Fermi -LAT detection of high-energy emission from behind-the-limb (BTL) solar flares that occurred 2013 October 11, and 2014 January 6 September 1. The observations are associated with active regions originating behind both eastern western limbs, as determined by STEREO . All three very fast coronal mass ejections (CMEs) strong energetic particle events. present updated localizations >100 MeV photon emission, hard X-ray (HXR) EUV images, broadband spectra 10 keV...
Abstract In this paper, we report two homologous circular-ribbon flares associated with filament eruptions. They were well observed by the New Vacuum Solar Telescope and Dynamics Observatory on 2014 March 5. Prior to flare, small-scale filaments enclosed a circular pre-flare brightening lie along polarity inversion line around parasitic polarity, which has shown continuous rotation since its first appearance. Two eventually erupt in sequence display an apparent writhing signature....
Abstract We present a database of solar flares registered by the Konus-Wind instrument during more than 27 yr operation, from 1994 November to now (2022 June). The constantly updated (hereafter KW-Sun) contains over 1000 events detected in instrument’s triggered mode and is accessible online at http://www.ioffe.ru/LEA/kwsun/ . For each flare, provides time-resolved energy spectra range ∼20 keV ∼15 MeV FITS format along with count-rate light curves three wide-energy bands, G1 (∼20–80 keV), G2...
Regular observations of active processes in the solar atmosphere have been started using first stage multiwave Siberian Radioheliograph (SRH), a T-shaped 48-antenna array with 4–8 GHz operating frequency range and 10 MHz instantaneous receiving band. Antennas are mounted on central antenna posts Solar Radio Telescope. The maximum baseline is 107.4 m, angular resolution up to 70". We present examples disk at different frequencies, “negative” bursts, flares. sensitivity compact sources reaches...
ABSTRACT Recently, a number of peculiar flares have been reported that demonstrate significant nonthermal particle signatures with low, if any, thermal emission, which implies close association the observed emission primary energy release/electron acceleration region. This paper presents flare appears “cold” at impulsive phase, while displaying delayed heating later on. Using hard X-ray data from Konus- Wind , microwave observations by SSRT, RSTN, NoRH, and NoRP, context observations,...
Solar flares with a fan-spine magnetic topology can form circular ribbons. The previous study based on Hαline observations of the solar during March 05, 2014 by Xu et al. (2017) revealed uniform and continuous rotation fan-spine. Preliminary analysis flare time profiles quasi-periodic pulsations (QPPs) similar properties in hard X-rays, Hα, microwaves. In this work, we address which process observed periodicities are related to: periodic acceleration electrons or plasma heating? QPPs...
Context. We study the possibility of flare process triggering by waves propagating from sunspot along a magnetic loop (channel) to nearby site.
Abstract The goal of this paper is to understand the drivers, configurations, and scenarios two similar eruptive events, which occurred in same solar active region 9973 on 2002 June 1 2. 2 event was previously studied by Sui, Holman, Dennis (2006, ApJ, 646, 605; 2008, Adv. Space Res., 41, 976), who concluded that it challenging for popular flare models. Using multi-spectral data, we analyzed a combination events. Each events exhibited an evolving cusp-like feature. We have revealed these...
Two kinds of processes could occur during the flare decay phase: energy release or relaxation. Quasi-periodic pulsations (QPPs) broadband emission are a good tool for verification mechanisms. We aim to study phase X-class solar SOL2014-03-29T17:48. The observations in X-ray, microwave, and extreme ultraviolet (EUV) bands exploited fine temporal, spatial, spectral structures flare. periods, amplitudes, phases both fluxes physical parameters (emission measure, temperature) studied using...
We study the decay phase of solar flares in several spectral bands using a method based on that successfully applied to white light observed an M4 dwarf. selected and processed 102 events detected Sun-as-a-star flux obtained with SDO/AIA images 1600~Å 304~Å channels 54 1700~Å channel. The main criterion for selection time profiles was slow, continuous without significant new bursts. averaged were fitted analytical templates, different intervals, consisted combination two independent...
In this paper the role of particle beams in generation a close spatial and temporal correlation between hard X-ray (HXR) energy Hα line emission bursts solar flare 2004 July 25 is discussed. The light curves HXR reveal that pre-flare main events are correlated with variations line-of-sight (LOS) magnetic flux. shows three during phase, which accompanied by intensity increases. latter appear 10 locations (kernels) at different times succession; kernel associated strong sources situated on...
Aims. We studied the characteristic physical properties and behavior of broadband microwave sub-second pulsations observed in an expanding coronal loop during GOES C2.4 solar flare on 2011 August 10.
Regular observations of active processes in the solar atmosphere have been started using first stage multiwave Siberian Radioheliograph (SRH), a T-shaped 48-antenna array with 4–8 GHz operating frequency range and 10 MHz instantaneous receiving band. Antennas are set on central antenna posts Solar Radio Telescope. The maximum baseline is 107.4 m, angular resolution up to 70ʹʹ. We present examples disk at different frequencies, “negative” bursts, flares. sensitivity compact sources reaches...