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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…
A comparison of the simulations and observations for a nearby spiral arm
Paunzen, Ernst; Piecka, Martin
We present a review of our current understanding of the spiral structure of galaxies, based on the kinematic models.
The analysis is focused on the ability of galactic open clusters to trace the spiral arms, based on the recent data releases from Gaia. For this, a simple 1D description of the motion of spiral arms and clusters is introduced. …Interrelations between Astrochemistry and Galactic Dynamics
Mendoza, Edgar; Duronea, Nicolas; Ronsó, Daniele +4 more
This paper presents a review of ideas that interconnect Astrochemistry and Galactic Dynamics. Since these two areas are vast and not recent, each one has already been covered separately by several reviews. After a general historical introduction, and a needed quick review of processes like the stellar nucleosynthesis which gives the base to unders…