scholarly journals Three-dimensional structure of the magnetic field in the disk of the Milky Way

2017 ◽  
Vol 603 ◽  
pp. A15 ◽  
Author(s):  
A. Ordog ◽  
J. C. Brown ◽  
R. Kothes ◽  
T. L. Landecker
Keyword(s):  
Magnetic Field ◽  
Milky Way ◽  
Three Dimensional ◽  
Dimensional Structure ◽  
Three Dimensional Structure ◽  
The Magnetic Field

Reduced MHD in nearly potential magnetic fields

1997 ◽  
Vol 57 (1) ◽  
pp. 83-87 ◽  
Author(s):  
H. R. STRAUSS
Keyword(s):  
Magnetic Field ◽  
Magnetic Fields ◽  
Potential Field ◽  
Three Dimensional ◽  
Pressure Effects ◽  
Mhd Equations ◽  
Dimensional Structure ◽  
Three Dimensional Structure ◽  
The Magnetic Field

Reduced, approximate MHD equations are derived for the case where the magnetic field is close to a potential field. The potential field can have an arbitrary three-dimensional structure, as long as it is non-vanishing. Finite current and pressure effects are included.

scholarly journals Three-dimensional density and compressible magnetic structure in solar wind turbulence

2018 ◽  
Vol 36 (2) ◽  
pp. 527-539 ◽  
Author(s):  
Owen W. Roberts ◽  
Yasuhito Narita ◽  
C.-Philippe Escoubet
Keyword(s):  
Magnetic Field ◽  
Solar Wind ◽  
Three Dimensional ◽  
Field Direction ◽  
Dimensional Structure ◽  
Magnetic Field Direction ◽  
Three Dimensional Structure ◽  
Slow Wind ◽  
Incompressible Turbulence ◽  
The Magnetic Field

Abstract. The three-dimensional structure of both compressible and incompressible components of turbulence is investigated at proton characteristic scales in the solar wind. Measurements of the three-dimensional structure are typically difficult, since the majority of measurements are performed by a single spacecraft. However, the Cluster mission consisting of four spacecraft in a tetrahedral formation allows for a fully three-dimensional investigation of turbulence. Incompressible turbulence is investigated by using the three vector components of the magnetic field. Meanwhile compressible turbulence is investigated by considering the magnitude of the magnetic field as a proxy for the compressible fluctuations and electron density data deduced from spacecraft potential. Application of the multi-point signal resonator technique to intervals of fast and slow wind shows that both compressible and incompressible turbulence are anisotropic with respect to the mean magnetic field direction P⟂≫P∥ and are sensitive to the value of the plasma beta (β; ratio of thermal to magnetic pressure) and the wind type. Moreover, the incompressible fluctuations of the fast and slow solar wind are revealed to be different with enhancements along the background magnetic field direction present in the fast wind intervals. The differences in the fast and slow wind and the implications for the presence of different wave modes in the plasma are discussed. Keywords. Interplanetary physics (MHD waves and turbulence)

Three-dimensional Structure of the Milky Way Dust: Modeling of LAMOST Data

2018 ◽  
Vol 858 (2) ◽  
pp. 75 ◽  
Author(s):  
Linlin Li ◽  
Shiyin Shen ◽  
Jinliang Hou ◽  
Haibo Yuan ◽  
Maosheng Xiang ◽  
...  
Keyword(s):  
Milky Way ◽  
Three Dimensional ◽  
Dimensional Structure ◽  
Three Dimensional Structure ◽  
Dust Modeling

scholarly journals The Andromeda Stream

2004 ◽  
Vol 21 (2) ◽  
pp. 203-206 ◽  
Author(s):  
G. F. Lewis ◽  
R. A. Ibata ◽  
S. C. Chapman ◽  
A. M. N. Ferguson ◽  
A. W. McConnachie ◽  
...  
Keyword(s):  
Milky Way ◽  
Dwarf Galaxy ◽  
Three Dimensional ◽  
Dimensional Structure ◽  
Three Dimensional Structure ◽  
Andromeda Galaxy ◽  
Tidal Stream ◽  
Kinematic Properties

AbstractThe existence of a stream of tidally stripped stars from the Sagittarius dwarf galaxy demonstrates that the Milky Way is still in the process of accreting mass. More recently, an extensive stream of stars has been uncovered in the halo of the Andromeda galaxy (M31), revealing that it too is cannibalising a small companion. This paper reports the recent observations of this stream, determining its spatial and kinematic properties, and tracing its three-dimensional structure, as well as describing future observations and what we may learn about the Andromeda galaxy from this giant tidal stream.

scholarly journals A Survey of Nova Remnants

1987 ◽  
Vol 93 ◽  
pp. 467-473
Author(s):  
H.W. Duerbeck ◽  
W.C. Seitter
Keyword(s):  
Milky Way ◽  
Three Dimensional ◽  
Progress Report ◽  
Dimensional Structure ◽  
Three Dimensional Structure ◽  
Sufficient Detail ◽  
Nova Shells ◽  
Spectral Survey

AbstractExnovae and nova shells are generally faint and difficult to observe. Only a few have been studied, and even less of them in sufficient detail. We give a progress report on our survey of exnovae and nova shells, especially on the results of a spectral survey of novae in the southern Milky Way. The three-dimensional structure in the light of Hα derived for the nebula of GK Per is displayed.

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