A5077948982- Solar and Space Plasma Dynamics
- Ionosphere and magnetosphere dynamics
- Astro and Planetary Science
- Atmospheric Ozone and Climate
- Stellar, planetary, and galactic studies
- Geophysics and Gravity Measurements
- Gamma-ray bursts and supernovae
- Planetary Science and Exploration
- Astrophysics and Star Formation Studies
- Spacecraft Design and Technology
- Spacecraft and Cryogenic Technologies
- Dark Matter and Cosmic Phenomena
- Radiation Therapy and Dosimetry
- Solar Radiation and Photovoltaics
- Radiation Dose and Imaging
- Space Science and Extraterrestrial Life
- Nail Diseases and Treatments
- Atmospheric and Environmental Gas Dynamics
- solar cell performance optimization
- Geomagnetism and Paleomagnetism Studies
- Geochemistry and Geologic Mapping
- Astrophysics and Cosmic Phenomena
Space Research Institute
2017-2024
Lomonosov Moscow State University
2017-2024
National Research University Higher School of Economics
2019-2024
Russian Academy of Sciences
2023
Abstract The Earth's hydrogen exosphere Lyman‐ α radiation was mapped with the Solar Wind Anisotropies/Solar and Heliospheric Observatory (SWAN/SOHO) instrument in January 1996, 1997, 1998 (low solar activity). use of a absorption cell allowed to disentangle interplanetary emission from geocoronal one assign absorbed signal almost entirely geocorona. geocorona found extend at least up 100 Earth radii ( R E ) an intensity 5 Rayleigh, unprecedented distance well exceeding recent results Lyman...
Abstract The LEXI and SMILE missions will provide soft X‐ray images of the Earth's magnetosheath cusps after their anticipated launch in 2023 2024, respectively. IBEX mission showed potential an Energetic Neutral Atom (ENA) instrument to image dayside cusps, albeit over long hours required raster with a single pixel imager. Thus, it is timely discuss two imaging techniques relevant science topics. We simulate low‐ENA that might be observed by virtual spacecraft during interesting solar wind...
Abstract The shape of the heliosphere is currently under active debate. Energetic neutral atoms (ENAs) offer best method for investigating global structure heliosphere. To date, Interstellar Boundary Explorer (IBEX) and Ion Neutral Camera (INCA) that was on board Cassini provide only ENA observations While extensive modeling has been done at IBEX-Hi energies (0.52–6 keV), no conducted INCA (5.2–55 keV). Here, we use an model based hybrid results capture heating acceleration pickup ions...
Abstract We present an unprecedented comparison of ∼0.52–55 keV energetic neutral atom (ENA) heliosheath measurements, remotely sensed by the Interstellar Boundary Explorer (IBEX) mission and Ion Neutral Camera (INCA) on Cassini mission, with modeled ENAs inferred from interstellar pickup protons that have been accelerated at termination shock, using hybrid simulations, to assess ion energetics within heliosheath. This is first study use simulations are able accurately model acceleration...
Abstract Interstellar neutrals (ISNs), pick-up ions (PUIs), and energetic neutral atoms (ENAs) are fundamental constituents of the heliosphere its interaction with neighboring interstellar medium. Here, we focus on selected aspects present-day theory modeling these particles. In last decades, progress in understanding role PUIs ENAs for global very local medium is impressive still growing. The increasing number measurements allows verification continuing development theories model attempts....
ABSTRACT The interstellar boundary explorer (IBEX) has been measuring fluxes of the energetic neutral atoms (ENAs) using IBEX-Hi (0.3–6 keV) instrument since 2008. We have developed a numerical time-depended code to calculate globally distributed flux (GDF) hydrogen ENAs employing both (1) 3D kinetic-MHD model global heliosphere and (2) reconstruction atom trajectories from 1 au, where they are observed by IBEX, point their origin in inner heliosheath (IHS). key factor simulation is detailed...
Most stars generate winds and move through the interstellar medium that surrounds them. This movement creates a cocoon formed by deflection of these envelops protects stars. We call “cocoons” astrospheres. The Sun has its own cocoon, heliosphere. heliosphere is an immense shield Solar System from harsh, galactic radiation. radiation enters affects life on Earth as well human space exploration. Galactic cosmic rays are dominant source principal hazard affecting missions within our System....
Abstract Global models of the heliosphere are critical tools used in interpretation heliospheric observations. There several three-dimensional magnetohydrodynamic (MHD) that rely on different strategies and assumptions. Until now only one paper has compared global models, but without magnetic field effects. We compare results two MHD BU Moscow models. Both use identical boundary conditions to how numerical approaches physical assumptions contribute solution. Based treatments discontinuities,...
Abstract Energetic neutral atom (ENA) models typically require post-processing routines to convert the distributions of plasma and H atoms into ENA maps. Here we investigate how two kinetic-MHD heliosphere (the BU Moscow models) manifest in modeled maps using same prescription they compare with Interstellar Boundary Explorer (IBEX) observations. Both MHD treat solar wind as a single-ion for protons, which include thermal ions, pick-up ions (PUIs), electrons. Our partitions three distinct ion...
Abstract Ly α absorption profiles have been used to detect astrospheres and heliospheric from the hydrogen wall heliotail. Using magnetohydrodynamic models of heliosphere, we can compare simulated observed probe neutral within near heliosphere. There is an ongoing controversy whether heliosphere has a long “comet-like” tail or short “croissant-like” tail. Here present first investigation using croissant-like With identical boundary conditions BU model, which presents tail, Moscow comet-like...
Abstract This paper examines the geometry of interstellar magnetic field lines close to boundary heliosphere in direction unperturbed local field, where are spread apart by heliopause (HP). Such parting establishes a region weaker about 300 au size northern hemisphere that acts as giant trap affecting propagation galactic cosmic rays (GCRs). The choice an analytic model very medium allows us qualitatively study resulting draping pattern while avoiding unphysical dissipation across...
Abstract Measuring energetic neutral atoms (ENAs) allows for the remote observation of ion populations from frontiers our heliosphere. In this study, we compare ENAs observed with IBEX-Lo instrument onboard Interstellar Boundary Explorer ENA predictions two heliosphere models. contrast to previous studies, paper presents model-data comparisons energy range 50 eV–2 keV over one full solar cycle not only in upwind direction (Voyager 1 and Voyager 2 sky directions), but also north pole, south...
The pickup protons originate as a result of the ionization hydrogen atoms in supersonic solar wind, forming suprathermal component heliosphere. While picked by heliospheric magnetic field and convected into heliosheath, may suffer stochastic acceleration wind turbulence region from Sun up to termination shock, where they can also experience shock-drift or reflection cross-shock potential. These processes create high-energy "tail" ion energy distribution. properties this energetic proton...
Abstract Determining the magnitude and direction of interstellar magnetic field ( B ISM ) is a long-standing problem. To date, some methods to infer have utilized best-fit models positions termination shock heliopause measured by Voyager 1 2. Other use circularity Interstellar Boundary Explorer (IBEX) ribbon assuming secondary energetic neutral atom (ENA) mechanism. Previous studies revealed that organizes orientation heliotail with respect solar meridian. Here we propose new way based on...
Abstract Quantitative analysis of the interstellar heavy (oxygen and neon) atom fluxes obtained by Interstellar Boundary Explorer ( IBEX ) suggests existence secondary oxygen component. This component is formed near heliopause due to charge exchange ions with hydrogen atoms, as was predicted theoretically. A detailed quantitative atoms only possible a model that takes into account both filtration primary production in boundary region heliosphere well simulation motion inside heliosphere....
Abstract This review summarizes our current understanding of the outer heliosphere and local interstellar medium (LISM) inferred from observations modeling interplanetary Lyman- $\alpha $ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mi>α</mml:mi> </mml:math> emission. The emission is produced by solar photons (121.567 nm) backscattered H atoms inflowing to LISM. Studies radiation determined parameters hydrogen within a few astronomical units Sun. appeared be decelerated,...
ABSTRACT The hydrogen atoms penetrate the heliosphere from local interstellar medium, and while being ionized, they form population of pickup protons. distribution protons is modified by adiabatic heating (cooling) induced solar wind plasma compression (expansion). In this study, we emphasize importance energy change in inner heliosheath that usually either neglected or considered improperly. effect process on spatial distributions energetic neutral (ENAs), which originate charge exchange...
Observations of the Lyman-a emissions from Interplanetary Hydrogen (IPH) atoms are made Mars’ orbit using a high spectral resolution instrument in echelle configuration. The measurements can uniquely be used to resolve IPH planetary H and subsequently determine brightness, velocity, thermal broadening flow along line sight. Planned as well serendipitous observations, both upwind downwind flow, analyzed these properties examine variability brightness with solar activity through declining...
Determining the magnitude and direction of interstellar magnetic field (BISM) is a longstanding problem. To date, some methods to infer have utilized best fit models positions termination shock heliopause measured by Voyager 1 2. Other use circularity IBEX Ribbon assuming secondary energetic neutral atom (ENA) mechanism. Previous studies revealed that BISM organizes orientation heliotail with respect solar meridian. Here, we propose new way based on ENA observations heliotail. high-latitude...
Exospheric tomography is a computational 3-D imaging technique that provides the estimates of neutral density distributions terrestrial exosphere from space-based ultraviolet (UV) measurements. Variability densities during geomagnetically active conditions has been previously reported, motivating development time-dependent tomographic techniques can characterize both spatial and temporal scales these events. However, solving dynamic exospheric problem be challenging owing to its...
Whitepaper #038 in the Decadal Survey for Solar and Space Physics (Heliophysics) 2024-2033. Main topics: basic research. Additional outer heliosphere; space-based missions/projects; emerging opportunities.
ABSTRACT In this paper, we search for the possible imprints of secondary interstellar hydrogen atoms created at heliospheric boundary in full-sky maps fluxes Earth orbit. By using our three-dimensional time-dependent kinetic model, are calculated different phases solar cycle and energy ranges. It is shown that flux obtained during minimum conditions range 1–20 eV have specific features such as blobs tails, which pronounced due to a signal component atoms. We investigate how these depend on...
Earth and Space Science Open Archive PosterOpen AccessYou are viewing the latest version by default [v1]SIHLA , a Mission of Opportunity to L1 Map H Lyman Alpha Emissions from Heliopause, Interplanetary Medium, Earth's Geocorona...