A5034625687- Solar and Space Plasma Dynamics
- Ionosphere and magnetosphere dynamics
- Atmospheric Ozone and Climate
- Earthquake Detection and Analysis
- Atmospheric chemistry and aerosols
- Atmospheric aerosols and clouds
- Solar Radiation and Photovoltaics
- Astro and Planetary Science
- Astrophysics and Cosmic Phenomena
- Geomagnetism and Paleomagnetism Studies
- Radioactivity and Radon Measurements
- Radiation Therapy and Dosimetry
- Methane Hydrates and Related Phenomena
- Atmospheric and Environmental Gas Dynamics
- Dyeing and Modifying Textile Fibers
- Geological Studies and Exploration
- Air Quality and Health Impacts
- Climate variability and models
- Lightning and Electromagnetic Phenomena
- melanin and skin pigmentation
- Photochromic and Fluorescence Chemistry
- Diverse Topics in Contemporary Research
- Geotechnical and Geomechanical Engineering
- Climate change and permafrost
- Color Science and Applications
St Petersburg University
2016-2025
National Research Nuclear University MEPhI
2021-2022
Institute of Physics
2010-2022
Ioffe Institute
2017-2021
University of Oulu
2017-2021
ETH Zurich
2021
P.N. Lebedev Physical Institute of the Russian Academy of Sciences
2020
Kandilli Observatory and Earthquake Research Institute
2015-2016
Institute of Terrestrial Magnetism Ionosphere and Radio Wave Propagation
2015-2016
National Observatory of Athens
2015-2016
Recent years have seen increased attention given to radon from two scientific directions. After neglecting as an earthquake precursor in the 1990s, it has become subject of discussions earthquake-forecast papers due growing networks monitoring different countries, particularly technologies real-time measurements where gamma spectrometers are great interest sources 222Rn identification. The second fast-developing direction involves Lithosphere–Atmosphere–Ionosphere Coupling (LAIC) models a...
The hybrid regularization technique developed at the Institute of Mathematics Potsdam University (IMP) is used to derive microphysical properties such as effective radius, surface-area concentration, and volume well single-scattering albedo a mean complex refractive index, from multiwavelength lidar measurements. We present continuation investigations IMP method. Theoretical studies degree ill-posedness underlying model, simulation results with respect analysis retrieval error particle data,...
A new version of the CRAC:CRII model computing ionization induced by cosmic rays in atmosphere is presented, which extended to upper and can be now applied entire atmosphere. The able compute rate at any given location time provided energy spectrum incoming known. It discussed that use earlier models, either analytical or Monte Carlo, with limited 500 MeV, well validated for (above a few g/cm 2 atmospheric depth, corresponds altitude about 40 km) study effect solar energetic particles but...
Abstract. Using a new reconstruction of the solar proton energy spectra for Ground Level Enhancement (GLE) events, based on fits to measurements from ground-based and satellite-borne instruments covering wide range, we quantitatively evaluate possible ionization effects in low middle atmosphere 58 out 66 GLE events recorded by world-wide neutron monitor network since 1956. The computations are numerical 3D CRAC:CRII model. A table effect caused at different atmospheric heights is provided....
This paper presents an overview of the main advances in Key Questions identified by Task Group 'What is Solar Influence on Climate' SCOSTEP CAWSES-II science program. We go through different aspects solar forcing from irradiance, including total irradiance (TSI) and spectral (SSI), to energetic particle forcing, precipitation (EPP) cosmic rays (CR). Besides discussing timeframe 2009 2013, we also illustrate proposed mechanism for climate variability sources listed above. The key questions...
Our direct knowledge of solar eruptive events is limited to several decades and does not include extreme events, which can only be studied by the indirect proxy method over millennia, or a large number sun-like stars. There gap, spanning 1--2 orders magnitude, in strength between directly observed reconstructed ones. Here, we study proxy-method sensitivity identify particle (SPEs). First, strongest SPE (23-Feb-1956), used as reference for proxy-based reconstructions, was revisited using...
Energetic electron precipitation (EEP) is associated with solar activity and space weather plays an important role in the Earth’s polar atmosphere. electrons from radiation belt precipitate into atmosphere during geomagnetic disturbances cause additional ionization rates middle These induced atmospheric lead to formation of radicals ion-molecular reactions at heights mesosphere upper stratosphere reactive compounds odd nitrogen NOy hydrogen HOx groups. are involved catalytic that destroy...
Abstract We retrieve ionization rates in the atmosphere caused by energetic electron precipitation from balloon observations polar and compare them against recommended for Phase 6 of Coupled Model Intercomparison Project. In our retrieval procedure, we consider precipitating electrons with energies about tens keV to 5 MeV. Our simulations 1‐D radiative‐convective model interactive neutral ion chemistry show that difference Project balloon‐based rate can lead underestimation N O x enhancement...
Abstract We present a study of atmospheric electricity using the chemistry‐climate model SOCOL considering ionization by solar energetic particles during an extreme proton event (SPE), galactic cosmic rays (GCR), and terrestrial radon (Rn‐222). calculate global distribution conductivity fair‐weather downward current density ( J z ) rates from all sources. found that is enhanced (by more than 3.5 pA/m 2 in source polar regions. Contribution Rn‐222 essential at middle low latitudes/altitudes...
Abstract. Energetic cosmic rays are the main source of ionization low-middle atmosphere, leading to associated changes in atmospheric properties. Via hypothetical influence on aerosol growth and facilitated formation clouds, this may be an important indirect link relating solar variability climate. This effect is highly debated, however, since proposed theoretical mechanisms still remain illusive qualitative, observational evidence inconclusive controversial. Therefore, questions regarding...
We compare enhancements of mesospheric volume mixing ratios hydroperoxyl radical HO2 and nitric acid HNO3, as well ozone depletion in the Northern Hemisphere (NH) polar night regions during energetic particle precipitation (EPP) January 2005 2012. utilize observations HO2, from Microwave Limb Sounder (MLS/Aura). During second half 2012, GOES satellite identified strong solar proton events with virtually same flux parameters. Geomagnetic disturbances were stronger, Dst decreasing up to 100 nT...
This letter presents a summary of phenomenological study the response polar stratosphere to strong solar energetic particle (SEP) events corresponding ground level enhancements (GLEs) cosmic rays. work is focused on evaluation possible influence atmospheric ionization caused by SEPs upon formation aerosol particles in over regions. Following case studies two major SEP/GLE events, January 2005 and September 1989, their effects stratospheric aerosols, we present here results an analysis...
The Earth–ionosphere cavity resonator is occupied primarily by the electromagnetic radiation of lightning below 100 Hz. phenomenon known as Schumann resonances (SR). SR intensity an excellent indicator activity and its distribution on global scales. However, long-term measurements from high latitude stations revealed a pronounced in-phase solar cycle modulation seemingly contradicting optical observations satellite, which do not show any significant variation in spatial scale....
Abstract. Energetic particle precipitation leads to ionization in the Earth's atmosphere, initiating formation of active chemical species which destroy ozone and have potential impact atmospheric composition dynamics down troposphere. We report on one exceptionally strong high-energy electron event detected by balloon measurements geomagnetic midlatitudes 14 December 2009, with rates locally comparable solar proton events. This was possibly caused wave–particle interactions slot region...
Abstract. Using a new reconstruction of the solar proton energy spectra for Ground Level Enhancement (GLE) events, based on fits to measurements from ground-based and satellite-borne instruments covering wide range, we quantitatively evaluate possible ionization effects in low middle atmosphere 58 out 66 GLE events recorded by world-wide neutron monitor network since 1956. The computations are numerical 3-D CRAC:CRII model. A table effect caused at different atmospheric heights is provided....
We present the results of analysis aerosol optical depth variations for January 2005 when an extreme solar energetic particle event occurred leading to a greatly enhanced flux particles penetrating into atmosphere. An increase concentration sulfate or nitrate was found on second day after in south magnetic pole region with maximum penetration anisotropic cosmic rays. This suggests that can lead notable changes chemical and physical properties polar troposphere. A statistical test confirms...
Solar proton events (SPEs) affect the Earth’s atmosphere, causing additional ionization in high-latitude mesosphere and stratosphere. Ionization rates from such solar maximize stratosphere, but formation of ozone-depleting nitrogen hydrogen oxides begins at mesospheric altitudes. The destruction ozone is associated with protons energies about 10 MeV higher will strongly depend on intensity flux these particles. Most studies investigating impact SPEs characteristics middle atmosphere have...
Abstract. The main ionization source of the middle and low Earth's atmosphere is related to energetic particles coming from outer space. Usually it cosmic rays that always present in atmosphere. But a case very strong solar eruption, some (SEPs) can reach middle/low increasing rate up orders magnitude at polar latitudes. We continue investigating such special class events their possible applications for natural variations aerosol content. After study extreme SEP event January 2005 its effect...
It is well-known that energetic particle precipitations during solar proton events increase ionization rates in the middle atmosphere enhancing production of hydrogen oxide radicals (HO x ) involved catalytic ozone destruction cycle. There are many studies where contribution particles to formation and loss has been widely investigated. However, until now, there was no solid evidence reduction galactic cosmic ray fluxes a magnetic storm, known as Forbush-effect, directly noticeably affects...
Energetic electron precipitation (EEP) via atmospheric ion production rates is a natural force acting on the atmosphere and climate systems. The correct estimation of EEP spectra for computation ionization an important issue estimating forces. In present paper, we propose favorable method forced by using new parameterization spectrum shape, which allow one to take into account range precipitating particles from tens keV several MeV. A function spectral fit will also be helpful in obtaining...