Results 81 to 90 of about 37,251 (259)

Slope of Magnetic Field–Density Relation as an Indicator of Magnetic Dominance

The Astrophysical Journal
The electromagnetic field is a fundamental force in nature that regulates the formation of stars in the Universe. Despite decades of efforts, a reliable assessment of the importance of the magnetic fields in star formation relations remains missing.
Mengke Zhao, Guang-Xing Li, Keping Qiu
doaj   +1 more source

Astrophysical turbulence modeling

, 2011
The role of turbulence in various astrophysical settings is reviewed. Among the differences to laboratory and atmospheric turbulence we highlight the ubiquitous presence of magnetic fields that are generally produced and maintained by dynamo action.
Alexandrova O, Allende Prieto C, Antia H M, Asplund M, Axel Brandenburg, Bahcall J N, Bahcall J N, Bahcall J N, Ballot J, Barge P, Bate M R, Benevolenskaya E E, Beresnyak A, Berezinskii V S, Binney J, Boldyrev S, Boldyrev S, Boldyrev S, Boldyrev S, Bonnor W B, Brandenburg A, Brandenburg A, Brandenburg A, Brandenburg A, Brandenburg A, Brandenburg A, Brandenburg A, Brandenburg A, Brandenburg A, Brandenburg A Kuroda T, Brown B P, Brummell N H, Brun A S, Brun A S, Brunt C M, Brunt C M, Busse F H, Cai K, Choudhuri A R, Crutcher R M, Crutcher R M, Davidson P A, de Avillez M A, De Villiers J-P, Del Sordo F Brandenburg A, Dolag K, Durisen R H, Frank J, Frisch U, Fryxell B, Galtier S, Gammie C F, Goldreich P, Green C A, Green C A, Haugen N E L, Hawley J F, Haxton W C, Hodgson L S, Hubbard A, Hubbard A Brandenburg A, Inaba S, Inutsuka S, Iroshnikov P S, Jappsen A-K, Johansen A Oishi J S Mac Low M-M Klahr H Henning T Youdin A, Kadomtsev B B, Kitchatinov L L, Kleeorin N, Korpi M J, Krause F, Kritsuk A G, Kritsuk A G, Kritsuk A G, Kritsuk A G, Kritsuk A G, Krolik J H, Krumholz M R, Krumholz M R, Käpylä P J Korpi M J, Küker M, Larson R B, Larson R B, Lighthill M J, Lithwick Y, Lithwick Y, Mac Low M-M, Machida M, Machida M, Miesch M S, Miesch M S, Mihalas D, Mitra D, Mitra D, Moffatt H K, Nordlund Å, O'Shea B W, Padoan P, Padoan P, Padoan P, Padoan P, Padoan P, Padoan P Nordlund Å, Pan L, Parker E N, Perez J C, Ponty Y, Pouquet A Baerenzung J Pietarila Graham J Mininni P Politano H Ponty Y, Pulkkinen P, Rempel M, Rempel M, Richard O, Richtmyer R D, Rieutord M, Roettiger K, Roettiger K, Rogers T M, Ruediger G, Ruzmaikin A, Schekochihin A A, Schekochihin A A, Schekochihin A A, Shakura N I, Shore S N, Smith C W, Solanki S K, Spiegel E A, Stefani F, Stein R F, Stein R F, Steinmetz M, Stone J M, Subramanian K, Troland T H, Truelove J K, Tuominen I, Turner N J, Vishniac E T, Vishniac E T, Vázquez-Semadeni E, Wik D R, Wyngaard J C, Yusef-Zadeh F, Åke Nordlund   +143 more
core   +1 more source

Correlating the interstellar magnetic field with protostellar jets and its sources

, 2011
This article combines new CCD polarimetric data with previous information about protostellar objects in a search for correlations involving the interstellar magnetic field.
Cerqueira, Adriano H., Hickel, Gabriel R., Rodrigues, Claudia V., Targon, Cristiane G.   +3 more
core   +1 more source

New Regime of MHD Turbulence: Cascade Below Viscous Cutoff

, 2002
In astrophysical situations, e.g. in the interstellar medium (ISM), neutrals can provide viscous damping on scales much larger than the magnetic diffusion scale.
Alex Lazarian, Ethan T. Vishniac, Jungyeon Cho, Larson R. B.   +3 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

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

Generation of Magnetic Fields in the Relativistic Shock of Gamma-Ray-Burst Sources

, 1999
We show that the relativistic two-stream instability can naturally generate strong magnetic fields with 1e-5 - 1e-1 of the equipartition energy density, in the collisionless shocks of Gamma-Ray-Burst (GRB) sources.
Loeb, Abraham, Medvedev, Mikhail V.
core   +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

Environments for Magnetic Field Amplification by Cosmic Rays

, 2009
We consider a recently discovered class of instabilities, driven by cosmic ray streaming, in a variety of environments. We show that although these instabilities have been discussed primarily in the context of supernova driven interstellar shocks, they ...
Achterberg, Blasi, Drury, Dunne, Ellen G. Zweibel, Fried, John E. Everett, Krall, Kulsrud, Kulsrud, Lagage, Medvedev, Niemiec, Ohira, Rees, Riquelme, Vladimirov, Zirakashvili, Zweibel, Zweibel   +19 more
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