Asen Grytsai
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View article: Excitation of ULF, ELF, and VLF Resonator and Waveguide Oscillations in the Earth–Atmosphere–Ionosphere System by Lightning Current Sources Connected with Hunga Tonga Volcano Eruption
Excitation of ULF, ELF, and VLF Resonator and Waveguide Oscillations in the Earth–Atmosphere–Ionosphere System by Lightning Current Sources Connected with Hunga Tonga Volcano Eruption Open
The simulations presented here are based on the observational data of lightning electric currents associated with the eruption of the Hunga Tonga volcano in January 2022. The response of the lithosphere (Earth)–atmosphere–ionosphere–magnet…
View article: Extreme cooling in Northeast China in January and concurrent maximum in the lower stratospheric temperature and ozone: Case studies
Extreme cooling in Northeast China in January and concurrent maximum in the lower stratospheric temperature and ozone: Case studies Open
View article: Coupling between maximum temperature and ozone levels in the lower stratosphere and extreme cooling events in Northeast China
Coupling between maximum temperature and ozone levels in the lower stratosphere and extreme cooling events in Northeast China Open
The little studied vertical temperature structure between the lower stratosphere and the surface during extreme cooling events in Northeast China is analyzed. Minimum diurnal temperatures in Changchun (44°N, 125°E) in January 2011, 2016, 2…
View article: Peculiarities and trends in the vertical ozone distribution 1973 - 2023 at Faraday/Vernadsky Antarctic station
Peculiarities and trends in the vertical ozone distribution 1973 - 2023 at Faraday/Vernadsky Antarctic station Open
We processed vertical ozone distribution measurements from the Faraday/Vernadsky station made by the Umkehr method for the 1973–2023 period. Ozone profiles in this unique series of ozone observations since 1973 cover pre-ozone hole t…
View article: Antarctic total ozone longitude–latitude dependence on sudden stratospheric warmings
Antarctic total ozone longitude–latitude dependence on sudden stratospheric warmings Open
We use Multi-Sensor Reanalysis and ground-based total ozone content (TOC) data to study total ozone variations in Antarctica near the dates of sudden stratospheric warmings (SSW). Three events were analyzed, including the warmings in 1988,…
View article: Antarctic tropopause by ozonesonde profiles from the Polar Atmospheric Chemistry at the Tropopause PACT database
Antarctic tropopause by ozonesonde profiles from the Polar Atmospheric Chemistry at the Tropopause PACT database Open
Stratosphere–troposphere exchange can be considered globally within the framework of the atmosphere's general circulation as the transfer of air masses through the tropopause with ascending (descending) flows in the tropics (extratro…
View article: Experimental data and models for radio diagnostics of extreme impacts “from above” and “from below” on ionospheric space weather: VLF, LOFAR and GNSS
Experimental data and models for radio diagnostics of extreme impacts “from above” and “from below” on ionospheric space weather: VLF, LOFAR and GNSS Open
Radio diagnostics, including scattering of electromagnetic waves (EMW) by spatiotemporal disturbances of the ionospheric plasma in the ELF (Extremely Low Frequencies, Hz), VLF (Very Low Frequencies, kHz), HF (High Frequencies, MHz) and mic…
View article: Current trends in the zonal distribution and asymmetry of ozone in Antarctica based on satellite measurements
Current trends in the zonal distribution and asymmetry of ozone in Antarctica based on satellite measurements Open
The development of the Antarctic ozone hole in late winter and spring (September–November) is the most noticeable phenomenon in the polar stratosphere. It has appeared every season since the early 1980s within the stratospheric polar vorte…
View article: Ozone Variations Over Antarctic Stations During Sudden Stratospheric Warmings
Ozone Variations Over Antarctic Stations During Sudden Stratospheric Warmings Open
View article: Impact of the 2018 major sudden stratospheric warming on weather over the midlatitude regions of Eastern Europe and East Asia
Impact of the 2018 major sudden stratospheric warming on weather over the midlatitude regions of Eastern Europe and East Asia Open
The impact of the Arctic major sudden stratospheric warming (SSW) in 2018 on regional cold weather in the northern midlatitudes is analyzed. Data from temperature observations in East Asia (Changchun, Northern China) and Eastern Europe (Kh…
View article: ULF perturbations: modeling Earth-Atmosphere-Ionosphere coupling, signal processing using information entropy, determination of the electric and magnetic field components and “experiment-theory comparison“
ULF perturbations: modeling Earth-Atmosphere-Ionosphere coupling, signal processing using information entropy, determination of the electric and magnetic field components and “experiment-theory comparison“ Open
We have used 2014–2017 data from the eight receiving stations of the Japan very low frequency (VLF) monitoring network. The nighttime data of the signals of the JJI transmitter on Kyushu Island, excited VLF electromagnetic waves (EMW…
View article: Impact of the 2018 Major Sudden Stratospheric Warming on Regional Weather in the Northern Midlatitudes
Impact of the 2018 Major Sudden Stratospheric Warming on Regional Weather in the Northern Midlatitudes Open
View article: Spectral Analysis and Information Entropy Approaches to Data of VLF Disturbances in the Waveguide Earth-Ionosphere
Spectral Analysis and Information Entropy Approaches to Data of VLF Disturbances in the Waveguide Earth-Ionosphere Open
Very low frequency (VLF) signals are considered as an important tool to study ionosphere disturbances. We have studied variations in signal amplitude of the Japanese JJI transmitter received by a network of eight Japan stations. The distin…
View article: Rossby Waves in Total Ozone over the Arctic in 2000–2021
Rossby Waves in Total Ozone over the Arctic in 2000–2021 Open
The purpose of this work is to study Rossby wave parameters in total ozone over the Arctic in 2000–2021. We consider the averages in the January–March period, when stratospheric trace gases (including ozone) in sudden stratospheric warming…
View article: Rossby Waves in Total Ozone over the Arctic in 2000–2021
Rossby Waves in Total Ozone over the Arctic in 2000–2021 Open
The purpose of this work is to study Rossby wave parameters in total ozone over Arctic in 2000–2021. We consider the averages in the January–March period, when stratospheric trace gases (including ozone) in sudden stratospheric…
View article: Results of the analysis of VLF and ULF perturbations and modeling atmosphere-ionosphere coupling
Results of the analysis of VLF and ULF perturbations and modeling atmosphere-ionosphere coupling Open
<p>The work continues one presented by us in 2021, which included the identification of three groups of periods in the VLF amplitude variations in the waveguide Earth-Ionosphere (WGEI) according to data of Japan receivers, obtained i…
View article: Antarctic planetary wave spectrum under different polar vortex conditions in 2019 and 2020 based on total ozone column data
Antarctic planetary wave spectrum under different polar vortex conditions in 2019 and 2020 based on total ozone column data Open
We examine the zonal wavenumber spectrum of planetary (Rossby) waves in the atmosphere above Antarctica in each of two contrasting years: in 2019, when there was a sudden stratospheric warming (SSW), and in 2020 when the Antarctic stratosp…
View article: The data processing and analysis methods for stratospheric ozone and planetary wave study
The data processing and analysis methods for stratospheric ozone and planetary wave study Open
We describe the methods and data sources for investigating the stratospheric ozone and planetary waves in the atmosphere in the framework of research provided by our international team. Selected ground-based and satellite instruments for o…
View article: The 16-Year Periodicity In The Winter Surface Temperature Variations In The Antarctic Peninsula Region
The 16-Year Periodicity In The Winter Surface Temperature Variations In The Antarctic Peninsula Region Open
The aim of this work is a comprehensive study of the 16-year periodicity of winter surface temperature in the Antarctic Peninsula (AP) region, described earlier, and its possible source based on weather station records over the 1952–2019 p…
View article: ULF Activity in the Earth Environment: Penetration of Electric Field from the Near-Ground Source to the Ionosphere under Different Configurations of the Geomagnetic Field
ULF Activity in the Earth Environment: Penetration of Electric Field from the Near-Ground Source to the Ionosphere under Different Configurations of the Geomagnetic Field Open
The problem with the penetration of electric fields from atmospheric near-Earth electric current sources to the ionosphere is investigated both within the dynamic simulations of the Maxwell equations in the frequency domain and within the …
View article: Planetary Wave Spectrum in the Stratosphere–Mesosphere during Sudden Stratospheric Warming 2018
Planetary Wave Spectrum in the Stratosphere–Mesosphere during Sudden Stratospheric Warming 2018 Open
The planetary wave activity in the stratosphere–mesosphere during the Arctic major Sudden Stratospheric Warming (SSW) in February 2018 is discussed on the basis of microwave radiometer (MWR) measurements of carbon monoxide (CO) above Khark…
View article: Methods for determining the perturbations in VLF &#160;in the Earth-ionosphere waveguide and TEC for ionospheric monitoring of catastrophic events in the Lithosphere-Atmosphere-Ionosphere-Magnetosphere (LAIM) system
Methods for determining the perturbations in VLF  in the Earth-ionosphere waveguide and TEC for ionospheric monitoring of catastrophic events in the Lithosphere-Atmosphere-Ionosphere-Magnetosphere (LAIM) system Open
<p>A new analytical model has been developed to determine the characteristics of the VLF complex eigenmodes in the waveguide Earth-Ionosphere (WGEI). The developed analytical model, in combination with appropriate numerical methods, …
View article: Planetary waves spectrum in stratosphere-mesosphere during SSW 2018
Planetary waves spectrum in stratosphere-mesosphere during SSW 2018 Open
<p>The planetary wave activity in the stratosphere–mesosphere during the Arctic major Stratospheric Sudden Warming (SSW) in February 2018 is discussed on the basis of the microwave radiometer (MWR) measurements of carbon mo…
View article: Planetary Wave Spectrum in the Stratosphere–Mesosphere during Sudden Stratospheric Warming 2018
Planetary Wave Spectrum in the Stratosphere–Mesosphere during Sudden Stratospheric Warming 2018 Open
The planetary wave activity in the stratosphere–mesosphere during the Arctic major Sudden Stratospheric Warming (SSW) in February 2018 is discussed on the basis of the microwave radiometer (MWR) measurements of carbon monoxide (CO) above K…
View article: Assessment of the zonal asymmetry trend in Antarctic total ozonecolumn using TOMS measurements and CCMVal-2 models
Assessment of the zonal asymmetry trend in Antarctic total ozonecolumn using TOMS measurements and CCMVal-2 models Open
In the paper the seasonal trends in the zonal asymmetry in the quasi-stationary wave pattern of total ozone column (TOC) at southern polar latitudes have been investigated. We evaluated and compared seasonal trends in the zonal TOC asymmet…
View article: Investigation of the Vertical Influence of the 11-Year Solar Cycle on Ozone Using SBUV and Antarctic Ground-Based Measurements and CMIP6 Forcing Data
Investigation of the Vertical Influence of the 11-Year Solar Cycle on Ozone Using SBUV and Antarctic Ground-Based Measurements and CMIP6 Forcing Data Open
The 11-year solar activity cycle in the vertical ozone distribution over the Antarctic station Faraday/Vernadsky in the Antarctic Peninsula region (65.25° S, 64.27° W) was analyzed using the Solar Backscatter Ultra Violet (SBUV) radiometer…
View article: Atmospheric Aerosol Distribution in 2016–2017 over the Eastern European Region Based on the GEOS-Chem Model
Atmospheric Aerosol Distribution in 2016–2017 over the Eastern European Region Based on the GEOS-Chem Model Open
The spatial and temporal distributions of atmospheric aerosols have been simulated using the GEOS-Chem model over the sparsely investigated Eastern European region. The spatial distribution of the particulate matter (PM2.5) concentration, …
View article: The influence of large amplitude planetary waves on the Antarctic ozone hole of austral spring 2017
The influence of large amplitude planetary waves on the Antarctic ozone hole of austral spring 2017 Open
Quasi-stationary planetary wave activity in the lower Antarctic stratosphere in the late austral winter was an important contributor to the preconditioning of the ozone hole in spring 2017. Observations show that the ozone hole area (OHA) …
View article: The Antarctic ozone hole during 2017
The Antarctic ozone hole during 2017 Open
We review the 2017 Antarctic ozone hole, making use of various meteorological reanalyses, and in-situ, satellite and ground-based measurements of ozone and related trace gases, and ground-based measurements of ultraviolet radiation. The 20…
View article: Solar activity influence on the ozone vertical distribution from SBUV data
Solar activity influence on the ozone vertical distribution from SBUV data Open
<p>Ozone content in the terrestrial atmosphere is dependent on chemical and dynamical factors including catalytic destruction under the influence of chlorine and bromine, Brewer–Dobson circulation, and large-scale atmospher…