L. Zelenyi
Space Research Institute of Russian Academy Of Sciences, Space Plasma, Department Member
Research Interests: Environmental Science, Chemistry, Astrobiology, Mars, Medicine, and 8 moreMultidisciplinary, Nature, Methane, ACS, Limit, Nomad, Orbiter, and ExoMars
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Anomalous transport at the boundaries between moving plasma and fixed magnetic field is a common problem for space laboratory and astrophysical plasmas Intermittent fluctuations represent one of the most promising candidate for the means... more
Anomalous transport at the boundaries between moving plasma and fixed magnetic field is a common problem for space laboratory and astrophysical plasmas Intermittent fluctuations represent one of the most promising candidate for the means of the turbulent transport In their presence the plasma flow is concentrating into jets with anomalously high ram pressure and flow density The jets looking to
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The current distribution in the nightside magnetosphere during a substorm event on Dec 10, 1996, is modeled using a local magnetic field model and two empirical large-scale magnetic field models. The empirical models utilizing both... more
The current distribution in the nightside magnetosphere during a substorm event on Dec 10, 1996, is modeled using a local magnetic field model and two empirical large-scale magnetic field models. The empirical models utilizing both high-altitude spacecraft data and low-altitude energetic particle measurements suggest that a thin current sheet, which formed during the substorm growth phase extended from the inner magnetotail at least out to 20-30 R E . It is shown that the results from the three different modeling approaches are consistent with each other, which is an important test for the validity of the empirical modeling methods. The models are compared and contrasted and their validity and use in magnetospheric studies are addressed.
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We study the statistical properties of nonlinear magnetic and plasma fluctuations over polar cusps and compare them with that of dayside magnetopause and near tail. Interball-1 and Polar data are normalized by the solar wind (SW) dynamic... more
We study the statistical properties of nonlinear magnetic and plasma fluctuations over polar cusps and compare them with that of dayside magnetopause and near tail. Interball-1 and Polar data are normalized by the solar wind (SW) dynamic pressure and parameterized by the Bx, By and Bz in SW and by the magnetic dipole tilt. The latter controls the magnetopause (MP) shape over cusp and the geometry of highly disturbed regions: (a) for the positive tilts (the dipole inclined towards the Sun) the disturbed magnetosheath (MSH) plasma locates over indented MP, (b) for the negative tilts the turbulence is seen from both sides of the smooth MP, having less pronounced higher-frequency component. In some Interball-1 cases and regularly in Polar data quite strong disturbances are seen deep in the cusp for any tilt angles during highly dynamic SW behavior. POLAR usually tracks the bottom of the disturbed region where the fluctuation energy is diminished and magnetic perturbations have compressi...
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We study high - latitude boundary layer (BL) for low magnetic shear magnetopause (MP). I terball detects demagnetized heated plasma of magnetosheath (MSH)n origin in `plasma balls' (PB, scale ~ few RE) The PB are seen mostly for... more
We study high - latitude boundary layer (BL) for low magnetic shear magnetopause (MP). I terball detects demagnetized heated plasma of magnetosheath (MSH)n origin in `plasma balls' (PB, scale ~ few RE) The PB are seen mostly for negative dipole tilts. CLUSTER sheds a new light on the BL structure: the normal to MP electric field can account for separation
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An international effort dedicated to science exploration of Jupiter system planned by ESA and NASA in the beginning of next decade includes in-depth science investigation of Europa. In parallel to EJSM (Europa-Jupiter System Mission)... more
An international effort dedicated to science exploration of Jupiter system planned by ESA and NASA in the beginning of next decade includes in-depth science investigation of Europa. In parallel to EJSM (Europa-Jupiter System Mission) Russian Space Agency and the academy of Science plan Laplace-Europa Lander mission, which will include the small telecommunication and science orbiter and the surface element: Europa Lander. In-situ methods on the lander provide the only direct possibility to assess environmental conditions, and to perform the search for signatures of life. A critical advantage of such in situ analysis is the possibility to enhance concentration and detection limits and to provide ground truth for orbital measurements. The science mission of the lander is biological, geophysical, chemical, and environmental characterizations of the Europa surface. Remote investigations from the orbit around Europa would not be sufficient to address fully the astrobiology, geodesy, and g...
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... Received 8 May 1990; accepted 9 August 1990; . Citation: Ashour-Abdalla, M., J. Büchner, and LM Zelenyi (1991), The Quasi-Adiabatic Ion Distribution in the Central Plasma Sheet and Its Boundary Layer, J. Geophys. Res., 96(A2),... more
... Received 8 May 1990; accepted 9 August 1990; . Citation: Ashour-Abdalla, M., J. Büchner, and LM Zelenyi (1991), The Quasi-Adiabatic Ion Distribution in the Central Plasma Sheet and Its Boundary Layer, J. Geophys. Res., 96(A2), 16011609, doi:10.1029/90JA01921. ...
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Experimental findings of the last decade (Interball, Geotail, Cluster observation) shed a new light on the dynamics magnetotail plasma system and its role in plasma processes during substorm perturbations. The reconnection processes in... more
Experimental findings of the last decade (Interball, Geotail, Cluster observation) shed a new light on the dynamics magnetotail plasma system and its role in plasma processes during substorm perturbations. The reconnection processes in thin current sheets (with the ...
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We investigate the dynamics of charged particles in the dayside magnetosphere in response to abrupt variations of the solar wind dynamical pressure. Using test particle simulations, we show that the electric field induced by the... more
We investigate the dynamics of charged particles in the dayside magnetosphere in response to abrupt variations of the solar wind dynamical pressure. Using test particle simulations, we show that the electric field induced by the compression of the frontside magnetosphere may be responsible for prominent energization of plasma sheet ions as well as trapping at high latitudes. We demonstrate that, due to the short-lived character of the magnetic field line reconfiguration (on the time scale of a few minutes), the particle magnetic moment (first adiabatic invariant) may not be conserved during such events. Ions that are initially bouncing from one hemisphere to the other are found to experience nonadiabatic energization up to the hundred of keV range while being injected into the outer cusp. Such injections involve particles from limited portions of the dayside flux tubes. The energetic particles that are produced in the outer cusp during such events subsequently circulate about the fi...
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While we expect productive utilization of the International Space Station (ISS) through at least 2020, there is an international need to define a concrete strategy and plan for the initial human exploration missions that will extend... more
While we expect productive utilization of the International Space Station (ISS) through at least 2020, there is an international need to define a concrete strategy and plan for the initial human exploration missions that will extend beyond Low Earth Orbit (LEO). The current long term objective of global human space exploration is eventual long duration presence of people on the Martian surface. Along the pathway between current activities in LEO and eventual Mars missions are a variety of preparatory exploration missions and intermediate goals. Over the last decade several different initial steps beyond LEO have been proposed. It is important to build international consensus on such a plan soon because future missions require near-term investments for new capabilities and no single nation can achieve an ambitious program on its own. A group of academic experts from the United States and Russia are working together to address this complex multidisciplinary planning problem. The goal ...
B. Hultqvist, G. Paschmann, D. Sibeck, T. Terasawa, R.A. Treumann and L. Zelenyi Swedish Institute of Space Physics, Kiruna, Sweden Max-Planck-Institut fur extraterrestrische Physik, Garching, Germany International Space Science... more
B. Hultqvist, G. Paschmann, D. Sibeck, T. Terasawa, R.A. Treumann and L. Zelenyi Swedish Institute of Space Physics, Kiruna, Sweden Max-Planck-Institut fur extraterrestrische Physik, Garching, Germany International Space Science Institute, Bern, Switzerland NASA/Goddard Space Flight Center, Greenbelt, USA Dept. Earth Planet. Science, Unversity of Tokyo, Tokyo, Japan Space Research Institute (IKI), Russian Academy of Sciences, Moscow
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While we expect productive utilization of the International Space Station (ISS) through at least 2020, there is an international need to define a concrete strategy and plan for the initial human exploration missions that will extend... more
While we expect productive utilization of the International Space Station (ISS) through at least 2020, there is an international need to define a concrete strategy and plan for the initial human exploration missions that will extend beyond Low Earth Orbit (LEO). The current long term objective of global human space exploration is eventual long duration presence of people on the Martian surface. Along the pathway between current activities in LEO and eventual Mars missions are a variety of preparatory exploration missions and intermediate goals. Over the last decade several different initial steps beyond LEO have been proposed. It is important to build international consensus on such a plan soon because future missions require near-term investments for new capabilities and no single nation can achieve an ambitious program on its own. A group of academic experts from the United States and Russia are working together to address this complex multidisciplinary planning problem. The goal ...
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Current sheets (CSs) play a crucial role in the storage and conversion of magnetic energy in planetary magnetotails. Using high‐resolution magnetic field data from MAVEN spacecraft, we report the existence of super thin current sheets... more
Current sheets (CSs) play a crucial role in the storage and conversion of magnetic energy in planetary magnetotails. Using high‐resolution magnetic field data from MAVEN spacecraft, we report the existence of super thin current sheets (STCSs) in the Martian magnetotail. The typical half‐thickness of the STCSs is ~5 km, and it is much less than the gyroradius of thermal protons (ρp). The STCSs are embedded into a thicker sheet with L ≥ ρp forming a multiscale current configuration. The formation of STCS does not depend on ion composition, but it is controlled by the small value of the normal component of the magnetic field at the neutral plane (BN). A number of the observed multiscale CSs are located in the parametric map close to the tearing‐unstable domain, and thus, the inner STCS can provide an additional free energy to excite ion tearing mode in the Martian magnetotail
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Spacecraft multipoint measurements in the magnetosheath (MSH) provide the ideal opportunity to investigate the processes that might lead to enhanced transport in a strongly disturbed plasma under collisionless conditions. Parallel... more
Spacecraft multipoint measurements in the magnetosheath (MSH) provide the ideal opportunity to investigate the processes that might lead to enhanced transport in a strongly disturbed plasma under collisionless conditions. Parallel transport can range from ballistic flight to diffusive transport. Perpendicular transport requires non-adiabatic processes. Once such processes set on, it can be much faster than collisional diffusion. Described as a
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Direct measurements of mass-loading was first measured on Mars and Venus satellites Mars-2,-3, and -5 and Venera-9 and -10 in 1970th. It was concluded that this loss mechanism can be important factor of atmospheric evolution of Mars.... more
Direct measurements of mass-loading was first measured on Mars and Venus satellites Mars-2,-3, and -5 and Venera-9 and -10 in 1970th. It was concluded that this loss mechanism can be important factor of atmospheric evolution of Mars. Unexpected result of these experiments was the existence of planetary ions dominated tail (accretion tail) with sharp boundary between the tail and massloaded solar wind flow. This boundary forms due to combination of asymmetric mass-loading and escape of solar protons from the magnetic barrier. Location of this boundary is determined by the balance of the solar wind flux and the flux of mass-loading planetary ions. Subsequently this boundary was found at Halley's comet at the location that followed from the analysis of induced magnetospheres of Mars and Venus. Observations at earlier Mars and Venus satellites, at PVO, Phobos-2, Mars Express and Venus Express give somewhat contradictory results on the solar wind induced mass loss value. We review ob...