scholarly journals Turbulent Diffusion of Magnetic Fields in Weakly Ionized Gas

2002 ◽  
Vol 578 (2) ◽  
pp. L113-L116 ◽  
Author(s):  
Eun-jin Kim ◽  
P. H. Diamond
Keyword(s):  
Magnetic Fields ◽  
Turbulent Diffusion ◽  
Ionized Gas ◽  
Weakly Ionized

scholarly journals 8.11. Magnetic avalanche model of mass supply in active galactic nuclei

1998 ◽  
Vol 184 ◽  
pp. 365-366
Author(s):  
T. Kuwabara ◽  
R. Matsumoto ◽  
K. Shibata
Keyword(s):  
Magnetic Fields ◽  
Active Galactic Nuclei ◽  
Large Scale ◽  
Galactic Nuclei ◽  
Model Parameters ◽  
Initial State ◽  
Ionized Gas ◽  
Mhd Simulations ◽  
Weakly Ionized ◽  
Co Observations

We present the results of axisymmetric, two-dimentional magnetohydrodynamic (MHD) simulations of weakly ionized gas torus threaded by large scale vertical magnetic fields. The gas torus corresponds to the 100pc scale circumnuclear torus observed by HST in nearby AGNs (e.g. NGC4261) or 1010M⊙ circumnuclear gas found by CO observations in luminous IR galaxies and quasars (e.g. Scoville et al. 1991). The initial state of simulation is a constant angular momentum polytropic torus threaded by uniform vertical magnetic fields. The torus is assumed to be rotating in a static, spherical hot halo. The model parameters are Eth = vs02/(γvk02) = 5 ×10−3 and Eth = vA02/vK02 = 6.6×10−6 where γ is the adiabatic index and vs0 and va0 are the sound speed and the Alfvén speed at r = r0 respectively.

AMBIPOLAR DIFFUSION AND TURBULENT MAGNETIC FIELDS IN MOLECULAR CLOUDS

2011 ◽  
Vol 26 (04) ◽  
pp. 235-249 ◽  
Author(s):  
MARTIN HOUDE ◽  
TALAYEH HEZAREH ◽  
HUA-BAI LI ◽  
THOMAS G. PHILLIPS
Keyword(s):  
Magnetic Fields ◽  
Molecular Clouds ◽  
Ambipolar Diffusion ◽  
Star Forming ◽  
Star Forming Regions ◽  
Spin Interactions ◽  
Line Narrowing ◽  
Weakly Ionized ◽  
Novel Method

We review the introduction and development of a novel method for the characterization of magnetic fields in star-forming regions. The technique is based on the comparison of spectral line profiles from coexistent neutral and ion molecular species commonly detected in molecular clouds, sites of star formation. Unlike other methods used to study magnetic fields in the cold interstellar medium, this ion/neutral technique is not based on spin interactions with the field. Instead, it relies on and takes advantage of the strong cyclotron coupling between the ions and magnetic fields, thus exposing what is probably the clearest observational manifestation of magnetic fields in the cold, weakly ionized gas that characterizes the interior of molecular clouds. We will show how recent development and modeling of the ensuing ion line narrowing effect leads to a determination of the ambipolar diffusion scale involving the turbulent component of magnetic fields in star-forming regions, as well as the strength of the ordered component of the magnetic field.

Dust-particle charge in weakly ionized gas-discharge plasma

2012 ◽  
Vol 97 (5) ◽  
pp. 55003 ◽  
Author(s):  
E. A. Lisin ◽  
O. S. Vaulina ◽  
O. F. Petrov ◽  
V. E. Fortov
Keyword(s):  
Dust Particle ◽  
Discharge Plasma ◽  
Gas Discharge ◽  
Particle Charge ◽  
Ionized Gas ◽  
Gas Discharge Plasma ◽  
Weakly Ionized ◽  
Dust Particle Charge

The Microscopic Treatment of Nonequilibrium Regions in a Weakly Ionized Gas

1983 ◽  
pp. 331-394 ◽  
Author(s):  
P. Segur ◽  
M. Yousfi ◽  
J. P. Boeuf ◽  
E. Marode ◽  
A. J. Davies ◽  
...  
Keyword(s):  
Ionized Gas ◽  
Weakly Ionized

scholarly journals Magnetic Fields and Ionized Gas in the Inner Galaxy: An Outer Scale for Turbulence and the Possible Role of HiiRegions

2004 ◽  
Vol 609 (2) ◽  
pp. 776-784 ◽  
Author(s):  
M. Haverkorn ◽  
B. M. Gaensler ◽  
N. M. McClure‐Griffiths ◽  
John M. Dickey ◽  
A. J. Green
Keyword(s):  
Magnetic Fields ◽  
Outer Scale ◽  
Ionized Gas

Acoustic Instabilities in Nonadiabatic Weakly Ionized Gases with Applied Magnetic Fields

AIAA Journal ◽  
1977 ◽  
Vol 15 (8) ◽  
pp. 1208-1210 ◽  
Author(s):  
D. Bastos-Netto ◽  
D. N. Nobre ◽  
J. P. Sudano
Keyword(s):  
Magnetic Fields ◽  
Weakly Ionized ◽  
Acoustic Instabilities

scholarly journals Magnetic Fields & Ionized Gas in Elliptical Galaxy Halos

1990 ◽  
Vol 140 ◽  
pp. 459-462
Author(s):  
Richard G. Strom
Keyword(s):  
Magnetic Field ◽  
Magnetic Fields ◽  
Elliptical Galaxy ◽  
Radio Sources ◽  
Early Type ◽  
Ionized Gas ◽  
X Ray ◽  
Galaxy Halos ◽  
Field Strengths

Faraday depolarization estimates of thermal densities within the components of double radio sources agree well with estimates from X-ray observations of hot halos around early-type galaxies, provided magnetic field strengths are close to their equipartition values. Internal Faraday dispersion is the main cause of the depolarization observed.

Sign in / Sign up

Export Citation Format

Share Document