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Search for (sub)stellar companions of exoplanet hosts by exploring the second ESA-Gaia data release
Mugrauer, M.; Michel, K. -U.
We present the latest results of an ongoing multiplicity survey of exoplanet hosts, which was initiated at the Astrophysical Institute and University Observatory Jena, using data from the second data release of the ESA-Gaia mission. In this study the multiplicity of 289 targets was investigated, all located within a distance of about 500\,pc from …
Magnetic Field Reconstruction for a Realistic Multi-Point, Multi-Scale Spacecraft Observatory
Klein, K. G.; Verscharen, D.; Roberts, O. W. +3 more
Future in situ space plasma investigations will likely involve spatially distributed observatories comprised of multiple spacecraft, beyond the four and five spacecraft configurations currently in operation. Inferring the magnetic field structure across the observatory, and not simply at the observation points, is a necessary step towards characte…
The Role of Terahertz and Far-IR Spectroscopy in Understanding the Formation and Evolution of Interstellar Prebiotic Molecules
Mifsud, Duncan V.; Hailey, Perry A.; Traspas Muiña, Alejandra +3 more
Stellar systems are often formed through the collapse of dense molecular clouds which, in turn, return copious amounts of atomic and molecular material to the interstellar medium. An in-depth understanding of chemical evolution during this cyclic interaction between the stars and the interstellar medium is at the heart of astrochemistry. Systemati…
Dynamics of the spiral-arm corotation and its observable footprints in the Solar Neighborhood
Pérez-Villegas, Angeles; Barros, Douglas A.; Michtchenko, Tatiana A. +1 more
This article discusses the effects of the spiral-arm corotation on the stellar dynamics in the Solar Neighborhood (SN). All our results presented here rely on: 1) observational evidence that the Sun lies near the corotation circle, where stars rotate with the same angular velocity as the spiral-arm pattern; the corotation circle establishes domain…
On the Variation of Intermittency of Fast and Slow Solar Wind With Radial Distance, Heliospheric Latitude, and Solar Cycle
Wawrzaszek, Anna; Echim, Marius
Intermittency, an important property of astrophysical plasma turbulence, is studied extensively during last decades fromin-situmeasurements of the solar wind plasma and magnetic field in the ecliptic plane and at higher latitudes, and heliocentric distances between 0.3 and 5 Astronomical Units. In this paper, we review the main findings on intermi…
Magnetohydrodynamic Turbulence in the Earth's Magnetotail from Observations and Global MHD Simulations
Lapenta, Giovanni; Goldstein, Melvyn L.; El-Alaoui, Mostafa +2 more
Magnetohydrodynamic (MHD) turbulent flows are found in the solar wind, the magnetosheath and the magnetotail plasma sheet. In this paper, we review both observational and theoretical evidence for turbulent flow in the magnetotail. MHD simulations of the global magnetosphere for southward interplanetary magnetic field (IMF) exhibit nested vortices …
The Science of Fundamental Catalogs
Makarov, Valeri V.; Kopeikin, Sergei M.
This review paper discusses the science of astrometric catalogs, their current applications and future prospects for making progress in fundamental astronomy, astrophysics and gravitational physics. We discuss the concept of fundamental catalogs, their practical realizations, and future perspectives. Particular attention is paid to the astrophysic…
Testing and Validating Two Morphological Flare Predictors by Logistic Regression Machine Learning
Erdélyi, R.; Korsós, M. B.; Morgan, H. +1 more
Whilst the most dynamic solar active regions (ARs) are known to flare frequently, predicting the occurrence of individual flares and their magnitude, is very much a developing field with strong potentials for machine learning applications. The present work is based on a method which is developed to define numerical measures of the mixed states of …
Control of magnetopause flux rope topology by non-local reconnection
Eastwood, Jonathan P.; Mejnertsen, Lars; Chittenden, Jeremy P.
Dayside magnetic reconnection between the interplanetary magnetic field and the Earth's magnetic field is the primary mechanism enabling mass and energy entry into the magnetosphere. During favorable solar wind conditions, multiple reconnection X-lines can form on the dayside magnetopause, potentially forming flux ropes. These flux ropes move tail…
The Key Role of Cold Ionospheric Ions As a Source of Hot Magnetospheric Plasma and As a Driver of the Dynamics of Substorms and Storms
Glocer, A.; Moore, T. E.; Giles, B. L. +3 more
The solar wind has been seen as the major source of hot magnetospheric plasma since the early 1960's. More recent theoretical and observational studies have shown that the cold (few eV) polar wind and warmer polar cusp plasma that flow continuously upward from the ionosphere can be a very significant source of ions in the magnetosphere and can bec…