Results 81 to 90 of about 3,397,976 (217)

Combining magnetic and electric sails for interstellar deceleration

, 2016
International audienceThe main benefit of an interstellar mission is to carry out in-situ measurements within a target star system. To allow for extended in-situ measurements, the spacecraft needs to be decelerated.
Hein, Andreas Makoto, Perakis, Nikolaos
core   +1 more source

A weak turbulence theory for incompressible magnetohydrodynamics [PDF]

, 2000
We derive a weak turbulence formalism for incompressible magnetohydrodynamics. Three-wave interactions lead to a system of kinetic equations for the spectral densities of energy and helicity. The kinetic equations conserve energy in all wavevector planes
S. V. Nazarenko, Nazarenko, Sergey, S. Galtier, Galtier, S., Newell, Alan C., Pouquet, A., A. C. Newell, A. Pouquet   +7 more
core   +1 more source

Interstellar Polarization Survey. V. Galactic Magnetic Field Tomography of the Spiral Arms Using Optical and Near-infrared Starlight Polarization

The Astronomical Journal
Interstellar linear polarization occurs when starlight passes through elongated dust grains aligned by interstellar magnetic fields. The observed polarization can come from different dust structures along the line of sight (LOS).
Y. Angarita, M. J. F. Versteeg, M. Haverkorn, V. Pelgrims, C. V. Rodrigues, A. M. Magalhães, R. Santos-Lima, Koji S. Kawabata   +7 more
doaj   +1 more source

Sub-Alfvénic Turbulence: Magnetic-to-kinetic Energy Ratio, Modification of Weak Cascade, and Implications for Magnetic Field Strength Measurements

The Astrophysical Journal
We study the properties of sub-Alfvénic magnetohydrodynamic (MHD) turbulence, i.e., turbulence with Alfvén mach number M _A = V _L / V _A < 1, where V _L is the velocity at the injection scale and V _A is the Alfvén velocity.
A. Lazarian, Ka Wai Ho, Ka Ho Yuen, Ethan Vishniac   +3 more
doaj   +1 more source

Dissipative-free models for wave dynamics of interstellar gas-dust medium in Galactic magnetic fields

, 2017
Current study of interstellar gas dynamics leads to the conclusion that large scale motions are dominated by strong coupling between gas-dust flows and Galactic magnetic fields: the widths of molecular lines is a direct evidence for such motions. However
양종만
core   +1 more source

Most-likely DCF Estimates of Magnetic Field Strength

The Astrophysical Journal
The Davis–Chandrasekhar–Fermi (DCF) method is widely used to evaluate magnetic fields in star-forming regions. Yet it remains unclear how well DCF equations estimate the mean plane-of-the-sky field strength in a map region. To address this question, five
Philip C. Myers, Ian W. Stephens, Simon Coudé   +2 more
doaj   +1 more source

The Huge Magnetic Toroids in the Milky Way Halo

The Astrophysical Journal
The magnetic fields in our Milky Way can be revealed by the distribution of Faraday rotation measures (RMs) of radio sources behind the Galaxy and of radio pulsars inside the Galaxy. Based on the antisymmetry of the Faraday sky in the inner Galaxy to the
J. Xu, J. L. Han
doaj   +1 more source

Evidence of a Thick Heliopause Boundary Layer Resulting from Active Magnetic Reconnection with the Interstellar Medium

The Astrophysical Journal
Voyager 1 and 2 data from the vicinity of the heliopause and very local interstellar medium are reexamined to better understand the confounding lack of rotation in the magnetic field ( B -field) across the heliopause observed by both Voyagers, despite ...
Drew L. Turner, Adam Michael, Elena Provornikova, Marc Kornbleuth, Merav Opher, Stefan Eriksson, Benoit Lavraud, Parisa Mostafavi, Matthew E. Hill, Pontus Brandt, Ian J. Cohen, Joseph Westlake, John D. Richardson, Nathan A. Schwadron, David J. McComas   +14 more
doaj   +1 more source

When Magnetic Fields Sculpt the Sky: The Riegel–Crutcher Cloud in Optical Polarization

The Astrophysical Journal
Filamentary structures are ubiquitous in the interstellar medium, yet the extent to which magnetic fields influence the morphology of cold atomic gas remains an open question.
Gabriel A. P. Franco, Mayara Gomides, Zhi-Yun Li, Fábio P. Santos, Farideh S. Tabatabaei   +4 more
doaj   +1 more source

Polytropic models of filamentary molecular clouds: structure, stability and magnetic fields [PDF]

, 2017
Recent observations made by the Herschel Space Observatory and the Planck Satellite have shown that molecular clouds are made by networks of filaments, shaped by interstellar turbulence and magnetic fields.
Toci, C., GALLI, Daniele
core