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45 results on '"Apatenkov, Sergey"'

1. Multiscale Currents Observed by MMS in the Flow Braking Region.

Author

Nakamura, Rumi, Varsani, Ali, Genestreti, Kevin J, Le Contel, Olivier, Nakamura, Takuma, Baumjohann, Wolfgang, Nagai, Tsugunobu, Artemyev, Anton, Birn, Joachim, Sergeev, Victor A, Apatenkov, Sergey, Ergun, Robert E, Fuselier, Stephen A, Gershman, Daniel J, Giles, Barbara J, Khotyaintsev, Yuri V, Lindqvist, Per-Arne, Magnes, Werner, Mauk, Barry, Petrukovich, Anatoli, Russell, Christopher T, Stawarz, Julia, Strangeway, Robert J, Anderson, Brian, Burch, James L, Bromund, Ken R, Cohen, Ian, Fischer, David, Jaynes, Allison, Kepko, Laurence, Le, Guan, Plaschke, Ferdinand, Reeves, Geoff, Singer, Howard J, Slavin, James A, Torbert, Roy B, and Turner, Drew L

Subjects
Magnetospheric Multiscale, field‐aligned current, flow braking, magnetic reconnection, plasma sheet boundary, Astronomical and Space Sciences, Atmospheric Sciences
Abstract

We present characteristics of current layers in the off-equatorial near-Earth plasma sheet boundary observed with high time-resolution measurements from the Magnetospheric Multiscale mission during an intense substorm associated with multiple dipolarizations. The four Magnetospheric Multiscale spacecraft, separated by distances of about 50 km, were located in the southern hemisphere in the dusk portion of a substorm current wedge. They observed fast flow disturbances (up to about 500 km/s), most intense in the dawn-dusk direction. Field-aligned currents were observed initially within the expanding plasma sheet, where the flow and field disturbances showed the distinct pattern expected in the braking region of localized flows. Subsequently, intense thin field-aligned current layers were detected at the inner boundary of equatorward moving flux tubes together with Earthward streaming hot ions. Intense Hall current layers were found adjacent to the field-aligned currents. In particular, we found a Hall current structure in the vicinity of the Earthward streaming ion jet that consisted of mixed ion components, that is, hot unmagnetized ions, cold E × B drifting ions, and magnetized electrons. Our observations show that both the near-Earth plasma jet diversion and the thin Hall current layers formed around the reconnection jet boundary are the sites where diversion of the perpendicular currents take place that contribute to the observed field-aligned current pattern as predicted by simulations of reconnection jets. Hence, multiscale structure of flow braking is preserved in the field-aligned currents in the off-equatorial plasma sheet and is also translated to ionosphere to become a part of the substorm field-aligned current system.

Published
2018

2. Near-Earth plasma sheet boundary dynamics during substorm dipolarization

Author

Nakamura, Rumi, Nagai, Tsugunobu, Birn, Joachim, Sergeev, Victor A, Le Contel, Olivier, Varsani, Ali, Baumjohann, Wolfgang, Nakamura, Takuma, Apatenkov, Sergey, Artemyev, Anton, Ergun, Robert E, Fuselier, Stephen A, Gershman, Daniel J, Giles, Barbara J, Khotyaintsev, Yuri V, Lindqvist, Per-Arne, Magnes, Werner, Mauk, Barry, Russell, Christopher T, Singer, Howard J, Stawarz, Julia, Strangeway, Robert J, Anderson, Brian, Bromund, Ken R, Fischer, David, Kepko, Laurence, Le, Guan, Plaschke, Ferdinand, Slavin, James A, Cohen, Ian, Jaynes, Allison, and Turner, Drew L

Subjects
Space Sciences, Physical Sciences, Substorm, Dipolarization, Plasma sheet boundary layer, Field-aligned current, Mathematical Sciences, Earth Sciences, Geochemistry & Geophysics, Meteorology & Atmospheric Sciences, Earth sciences, Mathematical sciences, Physical sciences
Abstract

We report on the large-scale evolution of dipolarization in the near-Earth plasma sheet during an intense (AL ~ -1000 nT) substorm on August 10, 2016, when multiple spacecraft at radial distances between 4 and 15 R E were present in the night-side magnetosphere. This global dipolarization consisted of multiple short-timescale (a couple of minutes) B z disturbances detected by spacecraft distributed over 9 MLT, consistent with the large-scale substorm current wedge observed by ground-based magnetometers. The four spacecraft of the Magnetospheric Multiscale were located in the southern hemisphere plasma sheet and observed fast flow disturbances associated with this dipolarization. The high-time-resolution measurements from MMS enable us to detect the rapid motion of the field structures and flow disturbances separately. A distinct pattern of the flow and field disturbance near the plasma boundaries was found. We suggest that a vortex motion created around the localized flows resulted in another field-aligned current system at the off-equatorial side of the BBF-associated R1/R2 systems, as was predicted by the MHD simulation of a localized reconnection jet. The observations by GOES and Geotail, which were located in the opposite hemisphere and local time, support this view. We demonstrate that the processes of both Earthward flow braking and of accumulated magnetic flux evolving tailward also control the dynamics in the boundary region of the near-Earth plasma sheet.Graphical AbstractMultispacecraft observations of dipolarization (left panel). Magnetic field component normal to the current sheet (BZ) observed in the night side magnetosphere are plotted from post-midnight to premidnight region: a GOES 13, b Van Allen Probe-A, c GOES 14, d GOES 15, e MMS3, g Geotail, h Cluster 1, together with f a combined product of energy spectra of electrons from MMS1 and MMS3 and i auroral electrojet indices. Spacecraft location in the GSM X-Y plane (upper right panel). Colorcoded By disturbances around the reconnection jets from the MHD simulation of the reconnection by Birn and Hesse (1996) (lower right panel). MMS and GOES 14-15 observed disturbances similar to those at the location indicated by arrows.

Published
2017

3. Numerical analysis of three-dimensional magnetopause-like reconnection properties by Hall MHD simulation for SPERF-AREX.

Author

He, Xianglei, Mao, Aohua, Apatenkov, Sergey, Zhang, Zhonglin, Wang, Zhibin, Sun, Mengmeng, Zou, Jitong, and Wang, Xiaogang

Abstract

The ground-based device, the Space Plasma Environment Research Facility (SPERF), is established for experimentally simulating magnetosphere plasma processes, with one of its major components, asymmetric reconnection experiment (AREX), for three-dimensional physics relevant to dayside asymmetric magnetopause reconnection. As an outstanding property of fast magnetic reconnection in collisionless plasmas, the Hall effect and its geometric features can be experimentally investigated in SPERF-AREX with various magnetic configurations related to different driven scenarios for simulating interplanetary magnetic field (IMF) conditions. In this work, the Hall effect and its geometric characteristics in such proposed experiments are numerically studied based on a Hall MHD model. The simulation results reveal that in the X-line geometry relevant to southward IMFs, the Hall field features in cross section perpendicular to the X-line are mostly analogous to typical two-dimensional Hall quadrupole structures, clearly an "anti-parallel reconnection" feature. In the separator (A-B null-line) geometry relevant to arbitrary IMF orientations, along the separator between magnetic nulls, the magnetic field configuration near a magnetic null also demonstrates the typical quadrupolar pattern. However, the pattern is distorted away (> 10 d i , here d i = c / ω p i is the ion inertial length) from the nulls, in a way similar to that in "component reconnection." Furthermore, the Hall effect induces a dawn-dusk asymmetry for both the X-line and the separator geometries. [ABSTRACT FROM AUTHOR]

Published
2024
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4. Topological analysis of three-dimensional magnetic reconnection in SPERF-AREX for simulated magnetopause events.

Author

He, Xianglei, Mao, Aohua, Apatenkov, Sergey, Wang, Zhibin, Sun, Mengmeng, Zou, Jitong, and Wang, Xiaogang

Subjects
MAGNETIC reconnection, MAGNETOPAUSE, INTERPLANETARY magnetic fields, ELECTROMAGNETS, SPACE environment, TOPOLOGICAL entropy, SUPERCONDUCTING coils
Abstract

A scientific research device for geospace physics, the Space Plasma Environment Research Facility (SPERF), is going to be in operation this year at the Harbin Institute of Technology, China. One of its laboratory simulation platforms, the Asymmetric Reconnection EXperiment (AREX), is designed to investigate the asymmetric magnetic reconnection relevant to the process in the dayside magnetopause of the Earth. As a ground-based experimental platform, AREX emphasizes three-dimensional (3D) asymmetric driving features with topological similarity relevant to dayside reconnection. Thus, in this paper, we focus on topological analysis based on numerical simulation of AREX reconnection processes. 3D topological features in various scenarios relevant to magnetopause reconnection in different interplanetary magnetic field (IMF) conditions are investigated by adjusting setup parameters of plasma sources and magnetic coils. The simulation results reveal that the plasma distribution of asymmetric reconnection in SPERF-AREX is analogous to that at the magnetopause. Various types of the 3D magnetic topology relevant to typical IMF conditions, including the X-line and the A–B null chain structures, are, respectively, identified and analyzed in detail. [ABSTRACT FROM AUTHOR]

Published
2023
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8. MMS observations of reconnection separatrix region in the magnetotail at different distances from the active neutral X-line

Author

Sergeev, Victor, primary, Apatenkov, Sergey, additional, Nakamura, Rumi, additional, Wellenzohn, Simon, additional, Plaschke, Ferdinand, additional, Baumjohann, Wolfgang, additional, Khotyaintsev, Yuri, additional, Burch, Jim, additional, Torbert, Roy, additional, Russell, Christopher, additional, and Giles, Barbara, additional

Published
2020
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9. MOESM1 of Near-Earth plasma sheet boundary dynamics during substorm dipolarization

Author

Nakamura, Rumi, Tsugunobu Nagai, Birn, Joachim, Sergeev, Victor, Contel, Olivier Le, Varsani, Ali, Baumjohann, Wolfgang, Nakamura, Takuma, Apatenkov, Sergey, Artemyev, Anton, Ergun, Robert, Fuselier, Stephen, Gershman, Daniel, Giles, Barbara, Khotyaintsev, Yuri, Per-Arne Lindqvist, Magnes, Werner, Mauk, Barry, Russell, Christopher, Singer, Howard, Stawarz, Julia, Strangeway, Robert, Anderson, Brian, Bromund, Ken, Fischer, David, Kepko, Laurence, Le, Guan, Plaschke, Ferdinand, Slavin, James, Cohen, Ian, Jaynes, Allison, and Turner, Drew

Abstract

Additional file 1. Figure S1. Local time distribution of the disturbances in H(X) and D(Y) components of mid-latitude magnetic fields at 10:00 UT, August 10, 2016. The red profiles show the data, while the blue dots show the results from the SCW model (Sergeev et al. 2011). The mid-latitude ground-based magnetic field disturbances shown in the plots are used to deduce the magnetic local time distribution and the total current of the SCW. Figure S2. a H and b D components of the nightside high-latitude magnetogram disturbances. The vertical lines show the 09:42 and 09:57 UT onset.

Published
2017
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11. The Distant Response of the Earthquake Precursory Process in foF2 as Inferred from Data of Vertical Sounding Stations Tokyo, Wakkanai and Yamagawa, 1957–2020

Author

Liperovskaya, Elena V., Rodkin, Mikhail V., Bezaeva, Natalia S., Series Editor, Gomes Coe, Heloisa Helena, Series Editor, Nawaz, Muhammad Farrakh, Series Editor, Kosterov, Andrei, editor, Lyskova, Evgeniya, editor, Mironova, Irina, editor, Apatenkov, Sergey, editor, and Baranov, Sergey, editor

Published
2023
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13. Solar Activity and Viral Pandemics

Author

Ragulskaya, Maria, Bezaeva, Natalia S., Series Editor, Gomes Coe, Heloisa Helena, Series Editor, Nawaz, Muhammad Farrakh, Series Editor, Kosterov, Andrei, editor, Lyskova, Evgeniya, editor, Mironova, Irina, editor, Apatenkov, Sergey, editor, and Baranov, Sergey, editor

Published
2023
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21. Formation of the Outer Radiation Belt: Adiabatic Effect and Stochastic Acceleration

Author

Antonova, Elizaveta E., Sotnikov, Nikita V., Kirpichev, Igor P., Riazantseva, Maria O., Stepanova, Marina V., Pinto, Victor, Inostroza, Ana, Espinoza, Cristóbal M., Vorobjev, Vyacheslav G., Yagodkina, Oksana I., Ovchinnikov, Ilya L., Naiko, Daniil Yu., Pulinets, Maria S., Bezaeva, Natalia S., Series Editor, Gomes Coe, Heloisa Helena, Series Editor, Nawaz, Muhammad Farrakh, Series Editor, Kosterov, Andrei, editor, Lyskova, Evgeniya, editor, Mironova, Irina, editor, Apatenkov, Sergey, editor, and Baranov, Sergey, editor

Published
2023
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22. Numerical Testing of Sound Speed Recovery by BC-Method for Wave Sources of Dirichlet, Neumann and Cauchy Type

Author

Semenov, Vladimir, Kubyshkin, Igor, Belishev, Mikhail, Ivanov, Ivan, Bobrov, Nikita, Bezaeva, Natalia S., Series Editor, Gomes Coe, Heloisa Helena, Series Editor, Nawaz, Muhammad Farrakh, Series Editor, Kosterov, Andrei, editor, Lyskova, Evgeniya, editor, Mironova, Irina, editor, Apatenkov, Sergey, editor, and Baranov, Sergey, editor

Published
2023
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23. Energetic Electrons Precipitation into the Earth’s Atmosphere During Magnetic Storm on 1–5 February 2015

Author

Kalegaev, Vladimir V., Ivanova, Alexandra R., Gruzdov, Danil S., Vlasova, Natalia A., Bazilevskaya, Galina A., Makhmutov, Vladimir S., Bezaeva, Natalia S., Series Editor, Gomes Coe, Heloisa Helena, Series Editor, Nawaz, Muhammad Farrakh, Series Editor, Kosterov, Andrei, editor, Lyskova, Evgeniya, editor, Mironova, Irina, editor, Apatenkov, Sergey, editor, and Baranov, Sergey, editor

Published
2023
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24. Various Mechanisms of ULF Wave–Electron Interaction: Case Studies

Author

Chelpanov, Maksim A., Mikhailova, Olga S., Mager, Pavel N., Smotrova, Ekaterina E., Klimushkin, Dmitri Yu., Bezaeva, Natalia S., Series Editor, Gomes Coe, Heloisa Helena, Series Editor, Nawaz, Muhammad Farrakh, Series Editor, Kosterov, Andrei, editor, Lyskova, Evgeniya, editor, Mironova, Irina, editor, Apatenkov, Sergey, editor, and Baranov, Sergey, editor

Published
2023
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25. How the Magnetospheric Activity Depends on IMF Equatorial Components

Author

Kubyshkina, Marina, Semenov, Vladimir, Tsyganenko, Nikolai, Wang, Xiaogang, Kubyshkin, Igor, Bezaeva, Natalia S., Series Editor, Gomes Coe, Heloisa Helena, Series Editor, Nawaz, Muhammad Farrakh, Series Editor, Kosterov, Andrei, editor, Lyskova, Evgeniya, editor, Mironova, Irina, editor, Apatenkov, Sergey, editor, and Baranov, Sergey, editor

Published
2023
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27. Helium Abundance Variability at Different Spatial Scales Inside the ICME

Author

Khokhlachev, Alexander A., Yermolaev, Yuri I., Riazantseva, Maria O., Rakhmanova, Liudmila S., Lodkina, Irina G., Bezaeva, Natalia S., Series Editor, Gomes Coe, Heloisa Helena, Series Editor, Nawaz, Muhammad Farrakh, Series Editor, Kosterov, Andrei, editor, Lyskova, Evgeniya, editor, Mironova, Irina, editor, Apatenkov, Sergey, editor, and Baranov, Sergey, editor

Published
2023
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29. Meteorological Response of Kamchatka Seismicity

Author

Schekotov, Alexander, Borovleva, Karina, Pilipenko, Vyacheslav, Chebrov, Danila, Hayakawa, Masashi, Bezaeva, Natalia S., Series Editor, Gomes Coe, Heloisa Helena, Series Editor, Nawaz, Muhammad Farrakh, Series Editor, Kosterov, Andrei, editor, Lyskova, Evgeniya, editor, Mironova, Irina, editor, Apatenkov, Sergey, editor, and Baranov, Sergey, editor

Published
2023
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35. Quality Factor of the Kola Peninsula Central Part (Fennoscandian Shield) from the Seismic Records of the Earthquake in the Khibiny Intrusion on March 5, 2022

Author

Tarasov, Stanislav, Usoltseva, Olga, Bezaeva, Natalia S., Series Editor, Gomes Coe, Heloisa Helena, Series Editor, Nawaz, Muhammad Farrakh, Series Editor, Kosterov, Andrei, editor, Lyskova, Evgeniya, editor, Mironova, Irina, editor, Apatenkov, Sergey, editor, and Baranov, Sergey, editor

Published
2023
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36. Iterative Feature Selection with Redundancy Accounting for the Neural Network Solution of Inverse Problems of Magnetotelluric Sounding

Author

Shchurov, Nickolay, Isaev, Igor, Obornev, Ivan, Obornev, Eugeny, Rodionov, Eugeny, Shimelevich, Mikhail, Dolenko, Sergey, Bezaeva, Natalia S., Series Editor, Gomes Coe, Heloisa Helena, Series Editor, Nawaz, Muhammad Farrakh, Series Editor, Kosterov, Andrei, editor, Lyskova, Evgeniya, editor, Mironova, Irina, editor, Apatenkov, Sergey, editor, and Baranov, Sergey, editor

Published
2023
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37. Visual Statistics of the Total Geomagnetic Field Power

Author

Starchenko, Sergey V., Yakovleva, Svetlana V., Bezaeva, Natalia S., Series Editor, Gomes Coe, Heloisa Helena, Series Editor, Nawaz, Muhammad Farrakh, Series Editor, Kosterov, Andrei, editor, Lyskova, Evgeniya, editor, Mironova, Irina, editor, Apatenkov, Sergey, editor, and Baranov, Sergey, editor

Published
2023
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38. Magnetic Viscosity of Suevites from the Zhamanshin Impact Crater

Author

Bobrov, Nikita, Sergienko, Elena, Yanson, Svetlana, Kosterov, Andrei, Karpinsky, Vladimir, Kharitonskii, Petr, Ralin, Andrey, Bezaeva, Natalia S., Series Editor, Gomes Coe, Heloisa Helena, Series Editor, Nawaz, Muhammad Farrakh, Series Editor, Kosterov, Andrei, editor, Lyskova, Evgeniya, editor, Mironova, Irina, editor, Apatenkov, Sergey, editor, and Baranov, Sergey, editor

Published
2023
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41. FTIR Measurements of Stratospheric Gases at the St. Petersburg Site

Author

Virolainen, Yana, Polyakov, Alexander, Timofeyev, Yury, Poberovsky, Anatoly, Bezaeva, Natalia S., Series Editor, Gomes Coe, Heloisa Helena, Series Editor, Nawaz, Muhammad Farrakh, Series Editor, Kosterov, Andrei, editor, Lyskova, Evgeniya, editor, Mironova, Irina, editor, Apatenkov, Sergey, editor, and Baranov, Sergey, editor

Published
2023
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44. Section of the Asha Series (Southern Urals)—Basu or Zigan Formation?

Author

Golovanova, Inessa V., Danukalov, Konstantin N., Parfirjev, Nikita P., Sal’manova, Raushaniya Yu., Sergeeva, Nina D., Bezaeva, Natalia S., Series Editor, Gomes Coe, Heloisa Helena, Series Editor, Nawaz, Muhammad Farrakh, Series Editor, Kosterov, Andrei, editor, Lyskova, Evgeniya, editor, Mironova, Irina, editor, Apatenkov, Sergey, editor, and Baranov, Sergey, editor

Published
2023
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