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Signatures of the Galactic bar in high-order moments of proper motions measured by Gaia
Allende Prieto, Carlos; Palicio, Pedro A.; Martinez-Valpuesta, Inma +1 more
Our location in the Milky Way provides an exceptional opportunity to gain insight on the galactic evolution processes, and complement the information inferred from observations of external galaxies. Since the Milky Way is a barred galaxy, the study of motions of individual stars in the bulge and disc is useful to understand the role of the bar. Th…
Current Sheets with Multicomponent Plasma in Magnetospheres of Planets of the Solar System
Popov, V. Yu.; Petrukovich, A. A.; Grigorenko, E. E. +2 more
A self-consistent hybrid model of a thin current sheet (TCS) with a thickness of the order of several ion gyroradii is proposed that takes into account the multicomponent nature of collisionless space plasma. Several plasma components can be present in the tails of the magnetospheres of terrestrial planets (for example, the Earth, Mercury, Mars, a…
Long-term Periodicities in Kepler Photometry of Open Cluster NGC 6811
Saar, S. H.; Velloso, E. N.; do Nascimento, J. -D., Jr.
Long-term photometric variability can sometimes be related to the emergence of starspots in the photosphere following a quasi-periodic magnetic activity cycle. In order to investigate the existence and properties of magnetic cycles in a narrow range of fundamental parameters, we focused on solar-type stars in the intermediate-age open cluster NGC …
Spectral properties of the surface reflectance of the northern polar region of Mercury
Diep, Pham Ngoc; Ngoc, Nguyen Bich; Bott, Nicolas
We analyze MESSENGER reflectance measurements covering the northern polar region of Mercury, the least studied region of the northern mercurian hemisphere. We use observations from the Mercury Dual Imaging System Wide-Angle Camera (MDIS/WAC) and the Mercury Atmospheric and Surface Composition Spectrometer (MASCS/VIRS) to study the spectral depende…
A deep insight into the ion foreshock with the help of test particle two-dimensional simulations
Lembège, Bertrand; Savoini, Philippe
Two-dimensional (2D) test particle simulations based on shock profiles issued from 2D full particle-in-cell (PIC) simulations are used in order to analyze the formation processes of ions back streaming within the upstream region after interacting with a quasi-perpendicular curved shock front. Two different types of simulations have been performed …
Equatorial Magnetosonic Waves: Do Nonlinear Interactions Play a Role in Their Evolution?
Walker, S. N.; Yearby, K. H.; Balikhin, M. A. +1 more
The occurrence of nonlinear interactions between discrete wave frequencies has been shown to play a significant role in the propagation and evolution of some plasma wave modes. In this paper we take advantage of closely spaced Cluster measurements to investigate the possibility nonlinear interactions occurring between the discrete emissions that a…
Asteroid Positions Based on the Dushanbe Part of the FON Project Observations
Andruk, V. M.; Shatokhina, S. V.; Yizhakevych, O. M. +4 more
Asteroid images identification and creation the positional catalogs based on digitized photographic observations of previous years were continued. Namely, the cooperation between Ukrainian Virtual Observatory (UkrVO) and the Institute of Astrophysics of the Academy of Sciences of Tajikistan make it possible to expand this work by involving numerou…
M Giants found in the First Byurakan Spectral Sky Survey data base. V. GAIA DR2 data
Gigoyan, K.
In this paper we study bright M {type giants found in the First Byurakan Survey (FBS) low-resolution (lr) spectroscopic data base. Phase dependence light-curves from large sky area variability data bases such as Catalina Sky Survey (CSS) and All-Sky Automated Survey for Supernovae (ASAS-SN), and the second Gaia data release data (Gaia DR2) high-qu…
Observations of Sounder Accelerated Electrons by Mars Express
Barabash, S.; Winningham, J. D.; Frahm, R. A. +5 more
The electron sensor of the Analyzer of Space Plasmas and Energetic Atoms experiment detects accelerated electrons during pulses of radio emissions from the powerful topside sounder: the Mars Advanced Radar for Subsurface and Ionosphere Sounding (MARSIS) on board the Mars Express spacecraft. Accelerated electrons are observed at energies up to 400 …
Optimized cutting off transit algorithm to study stellar rotation from PLATO mission light curves
Castro, Matthieu; de Almeida, Leandro; Anthony, Francys +4 more
Measuring the stellar rotation of one of the components in eclipsing binaries (EBs) or planetary systems is a challenge task. The difficulty is mainly due to the complexity of analyzing, in the same light curve, the signal from the stellar rotation mixed with the transit signal of a stellar or substellar companion, like a brown dwarf or planet. Th…