A5046179892- Ionosphere and magnetosphere dynamics
- Solar and Space Plasma Dynamics
- Geomagnetism and Paleomagnetism Studies
- Earthquake Detection and Analysis
- Astro and Planetary Science
- Magnetic confinement fusion research
- Geophysics and Gravity Measurements
- Atmospheric Ozone and Climate
- Magnetic Field Sensors Techniques
- Advanced MIMO Systems Optimization
- Particle physics theoretical and experimental studies
- GNSS positioning and interference
- Nuclear reactor physics and engineering
- Plasma Diagnostics and Applications
- Direction-of-Arrival Estimation Techniques
- Nuclear Physics and Applications
- Quantum Chromodynamics and Particle Interactions
- Inertial Sensor and Navigation
- Millimeter-Wave Propagation and Modeling
- Advanced Memory and Neural Computing
- earthquake and tectonic studies
- Industrial Engineering and Technologies
- Laser-induced spectroscopy and plasma
- Nuclear physics research studies
- Ion-surface interactions and analysis
St Petersburg University
2016-2025
Institute of Radio-Engineering and Electronics
2024
Ulyanovsk State Technical University
2024
N. I. Lobachevsky State University of Nizhny Novgorod
2015-2023
Angarsk State Technical Academy
2023
Intel (United States)
2018-2021
Intel (United Kingdom)
2018-2020
Plekhanov Russian University of Economics
2018
Institute of Physics
2002-2014
Russian Academy of Sciences
2013
We report THEMIS observations of a dipolarization front, sharp, large‐amplitude increase in the Z ‐component magnetic field. The front was detected central plasma sheet sequentially at X = −20.1 R E (THEMIS P1 probe), −16.7 (P2), and −11.0 (P3/P4 pair), suggesting its earthward propagation as coherent structure over distance more than 10 velocity 300 km/s. thickness found to be small ion inertial length. Comparison with simulations allows us interpret leading edge fast flow formed by burst...
Almost 40 years ago the concept of substorm current wedge was developed to explain magnetic signatures observed on ground and in geosynchronous orbit during expansion. In ensuing decades new observations, including radar low-altitude spacecraft, MHD simulations, theoretical considerations have tremendously advanced our understanding this system. The AMPTE/IRM, THEMIS Cluster missions added considerable observational knowledge, especially important role fast flows producing stresses that...
Recent studies have shown that most Earthward transport hi the midtail, high‐beta plasma sheet takes place in form of short‐lived, high‐speed flow bursts. Bursty bulk flows are observed both when is thin, such as during substorm expansion, and it thick, recovery. We present multi‐instrument observations from ISEE1 ISEE 2 spacecraft to argue becomes thick close its equilibrium state, magnetic field signatures events consistent with theoretically predicted plasma‐depleted flux tubes or...
At the end of April 2, 1978, ISEE 1 and 2 spacecraft moved inbound at ∼11 R E on nightside (0130 MLT). Due to a flapping motion plasma sheet crossed neutral region (central sheet) more than 10 times in hour between 2115 2215 UT. This provided unique opportunity study structure plasma/current its evolution during substorm growth early expansion before final disruption current sheet. Using minimum variance analysis magnetic field variations crossings as well finite ion gyroradius diagnostics,...
Earthward flow bursts associated with small auroral expansions, including pseudobreakups, and streamers are studied by using Geotail plasma magnetic field data Polar ultraviolet imager data. These accompanied dipolarization decrease in the pressure, which consistent characteristics of so‐called bubbles, have a timescale 2.5 min on average. Based statistical study bursts, it is shown that location flows centered about 0.4 hour local time east center expansion localized width 3 – 5 R E . This...
Abstract. Thirty rapid crossings of the magnetotail current sheet by Cluster spacecraft during July-October 2001 at a geocentric distance 19 RE are examined in detail to address structure sheet. We use four-point magnetic field measurements estimate electric density; spatial scale is estimated integration translation velocity calculated from temporal and derivatives. The local normal-related coordinate system for each case defined combining Minimum Variance Analysis (MVA) curlometer...
Fast vertical flapping oscillations of the plasma sheet have been observed by Cluster on September 26, 2001. The motion had speeds exceeding 100 km/s, an amplitude in excess 1 R E and a quasiperiod ∼3 min. current was mostly tilted Y ‐ Z plane (with tilt sometimes 45°). waves properties kink mode propagated toward dusk flank. allowed to probe structure sheet. Three different methods gave consistent evidence bifurcated cross‐tail with about half all concentrated two sheets (each ∼500–1000 km...
Observations of three closely‐spaced THEMIS spacecraft at 9–11 Re near midnight and close to the neutral sheet are used investigate a sharp injection/dipolarization front (SDF) propagating inward in flow‐braking region. This SDF was very thin current along North‐South direction embedded within an Earthward‐propagating flow burst. A short‐lived depression total magnetic field (down 1 nT), devoid wave activity intense particle fluxes, stays ahead SDF. Clear finite proton gyroradius effects,...
Simultaneous measurements of the low‐altitude energetic particle flux by NOAA spacecraft and geostationary magnetic field GOES 2 are used to test recently proposed isotropic boundary algorithm (IBA) method evaluate instantaneous magnetospheric configuration. According IBA method, equatorward proton precipitation, in brief (IB), corresponds separating adiabatic chaotic regimes motion tail current sheet is controlled properties equatorial field. In this study we confirm some fundamental...
Abstract. Using four-point magnetic field measurements by the Cluster spacecraft, we statistically analyze and electric current configurations during rapid crossings of sheet observed in July-October 2001 at geocentric distances 19 RE. The database includes 78 crossings, specially selected to apply multi-point data analysis techniques calculate vector derivatives. Observed bipolar variations jz, often with | jz |>jy, indicate that currents follow kinks sheet. density varies between...
We report on the evolving ion distributions associated with arrival of an earthward propagating dipolarization front in near‐Earth magnetotail using Time History Events and Macroscale Interactions during Substorms (THEMIS). Ion exhibit steady duskward anisotropy well before arrival, suggesting thin current sheet formation at ∼11 R E , growth phase a moderate geomagnetic substorm. As moves closer, additional, streaming population appears, resulting velocity moment. This eventually overwhelms...
We examine the pitch angle distribution (PAD) of suprathermal electrons (>40 keV) inside flux pileup regions (FPRs) that are located behind dipolarization fronts (DFs), in order to better understand particle energization mechanisms operating therein. The 303 earthward‐propagating DFs observed during 9 years (2001–2009) by Cluster 1 have been analyzed and divided into two groups according differential fluxes >40 keV FPR. One group, characterized low ( F < 500/cm 2 · s sr keV),...
Magnetospheric substorms are elemental processes of solar wind energy storage and explosive release in Earth's magnetosphere. They encompass fundamental plasma physics questions, ubiquitous during all types geomagnetic conditions, contribute significantly to magnetic storms, a key element Space Weather applications. This paper reviews recent major advances enabled by modern multi‐point space‐based ground‐based platforms. These datasets have also empowered system‐wide perspective advanced...
We use observations from five magnetospheric spacecraft in a fortuitous constellation to show that narrow transient plasma flow jets of considerable length formed the tail can intrude into inner magnetosphere and provide contribution total transport. A specific auroral structure, streamer, accompanied development this jet. These support ‘boiling’ sheet model consisting localized underpopulated tubes (bubbles) moving Earthward at high speeds as realistic way resolve ‘convection crisis’ close...
During continuous magnetospheric activity it is not uncommon to observe narrow (in MLT) transient particle injections (duration about 1–2 minute at E=100 keV and local time extent ≤ 1 hour in the nightside part of geosynchronous orbit. Using global UV images from POLAR spacecraft we analyze development auroral on December 22, 1996 during a sequence such observed by two LANL spacecraft. We found that are associated with specific localized form, streamer, which develops this sector. The...
Using the four‐spacecraft Cluster system, we analyze rapid neutral sheet crossings near apogee at about −18R E . In case studies of multiple oscillations locally quiet plasma as well in a statistical study dawn and dusk near‐flank portions typically obtain that these dynamical current sheets are very corrugated subsequent basically show large‐scale kink‐like waves propagating from tail center toward flanks. Propagation velocities range several tens km/s for sheets, up to 200 during fast...
Flow burst events with a flux transfer rate exceeding 2 mV/m and duration of less than 10 min observed by Geotail are compared auroral signatures obtained from the Polar ultraviolet imager. It is shown that all flow bursts correspond either to localized intensifications associated small poleward expansions pseudobreakups or an activation starting at edge expanded oval develop equatorward toward foot point satellite, including streamers. Earthward related mainly in region earthward 15 R E ,...
Slow plasma flows perpendicular to the magnetotail neutral sheet and associated with flapping motions of can occasionally exceed sensitivity threshold instruments. This is case in several events selected from 3 months observations by three‐dimensional instrument on AMPTE/IRM satellite. By comparing ion flow Z GSM direction correlated changes X ‐directed magnetic field, we estimate current velocity range a few tens hundreds kilometers per second. Our measurements thickness (0.1 – 1 R E )...
Abstract. We surveyed fast current sheet crossings (flapping motions) over the distance range 10–30 RE in magnetotail covered by Geotail spacecraft. Since local tilts of these dynamic sheets are large and variable events, we compare three different methods evaluating normals using 4-s/c Cluster data define success criteria for single-spacecraft-based method (MVA) to obtain reliable results. Then, after identifying more than ~1100 CS a 3-year period observations 1997–1999, address their...
Multi‐instrument data sets from the ground and satellites at both low high altitude have provided new results concerning substorm onset its source region in magnetosphere. Twenty‐six out of 37 events showed evidence azimuthally spaced auroral forms (AAFs) prior to explosive poleward motion associated with optical onset. The azimuthal wavelengths these onsets were found range between 132 583 km a mean value 307±115 km. occurrence rate increased decreasing wavelength down cutoff near 130 AAFs...