Numerical modeling of the linear polarization in molecular lines of the solar flash spectrum

2012 ◽  
Vol 55 ◽  
pp. 65-69
Author(s):  
I. Milié ◽  
M. Faurobert
Keyword(s):  
Numerical Modeling ◽  
Linear Polarization ◽  
Molecular Lines ◽  
Flash Spectrum

scholarly journals Polarization of Radio Molecular Lines and Mapping of Magnetic Field Direction

1984 ◽  
Vol 81 ◽  
pp. 274-275
Author(s):  
Shuji Deguchi ◽  
William D. Watson
Keyword(s):  
Magnetic Field ◽  
Diatomic Molecule ◽  
Linear Polarization ◽  
Field Direction ◽  
Emission Lines ◽  
Magnetic Field Direction ◽  
Interstellar Clouds ◽  
Molecular Emission ◽  
Rotational States ◽  
Molecular Lines

AbstractTwo level calculations by others for the linear polarizations expected for molecular emission lines from interstellar clouds are extended by considering a number of coupled rotational states of a diatomic molecule. Higher transitions commonly have strengths comparable with that of the J=1-0 transition so that depolarization due to coupling between the various J-states might be expected to reduce the predicted linear polarization. The significance of the null observational results obtained recently by Wannier, Scoville and Barvainis is assessed. The inclusion of additional states tends to decrease the maximum polarizations, though the calculated polarization is increased under conditions for which “superthermal” excitation occurs.

Parametric Study of Molecular Line Polarization in the Solar Atmosphere

2000 ◽  
Vol 179 ◽  
pp. 269
Author(s):  
K. E. Rangarajan ◽  
D. Mohan Rao
Keyword(s):  
Solar Atmosphere ◽  
Linear Polarization ◽  
Parametric Study ◽  
Elastic Collision ◽  
The Other ◽  
Strong Line ◽  
Molecular Line ◽  
Physical Constraints ◽  
Molecular Lines ◽  
Polarization Profiles

Extended AbstractThe polarimetric observations of the quiet sun show linear polarization in molecular lines of C2, MgH, etc. The molecular lines are very faint in the intensity spectrum. Q branch transitions of MgH are considered in this study. Using radiative transfer calculations, we find that the intensity and polarization profiles of MgH lines can be matched for a range of inelastic collisional rates (ΓI) and depolarizing elastic collision rates (D(2)) of the transitions in solar atmosphere. It is shown that the physical constraints imposed on these parameters can be used to estimate them. This procedure also allows us to get the oscillator strength (f). It is found for the strong line 5156.652 Å,f= 0.12, ΓI, = 5.59 × l07sec−1andD(2)= 1.29 × 108sec−1. Most of the other lines observed are weak by a factor of 3 in intensity compared to the 5156.652 Å line but show a polarization value of the order of 0.08%. One such typical line is 5156.997 Å. This line can be fitted for the parametersf= 0.04, ΓI, = 1.22 × 107sec−1andD(2)= 2.95 × 107sec−1.

scholarly journals Inferring the nature of turbulence in star-forming regions with polarimetric observations

2006 ◽  
Vol 2 (S237) ◽  
pp. 494-494
Author(s):  
D. Wiebe ◽  
W. D. Watson
Keyword(s):  
Thermal Radiation ◽  
Linear Polarization ◽  
Far Infrared ◽  
Dust Grains ◽  
Mhd Turbulence ◽  
Star Forming ◽  
Star Forming Regions ◽  
Submillimeter Wavelengths ◽  
Molecular Lines

AbstractWe consider the possibility to study the nature of MHD turbulence in star-forming regions with three different kinds of polarimetric data, namely, the linear polarization of starlight due to extinction by aligned dust grains, the polarized dust thermal radiation at far infrared or submillimeter wavelengths, and the linear polarization of molecular lines due to the Goldreich-Kylafis effect in the anisotropic MHD medium.

LINEAR POLARIZATION OF FLASH SPECTRUM OBSERVED FROM A TOTAL SOLAR ECLIPSE IN 2008

2009 ◽  
Vol 695 (2) ◽  
pp. L194-L197 ◽  
Author(s):  
Z. Q. Qu ◽  
X. Y. Zhang ◽  
Z. K. Xue ◽  
G. T. Dun ◽  
S. H. Zhong ◽  
...  
Keyword(s):  
Solar Eclipse ◽  
Linear Polarization ◽  
Total Solar Eclipse ◽  
Flash Spectrum

Investigation of Morphosedimentary Processes on a Schematic Louisiana Barrier Island Using Process-Based Numerical Modeling

2007 ◽  
Author(s):  
T. Campbell ◽  
B. de Sonneville ◽  
L. Benedet ◽  
D. J. W. Walstra ◽  
C. W. Finkl
Keyword(s):  
Numerical Modeling ◽  
Barrier Island

SIMULATION OF ELECTRICAL MONITORING OF DAMS WITH LEAKAGE WITH A TRANSVERSE PLACEMENT OF THE MEASURING INSTALLATION

2020 ◽  
Vol 8 (4) ◽  
pp. 69-82
Author(s):  
D.S. Rakisheva ◽  
◽  
B.G. Mukanova ◽  
I.N. Modin ◽  
◽  
...  
Keyword(s):  
Numerical Modeling ◽  
Water Level ◽  
Electrical Resistivity Tomography ◽  
Resistivity Tomography ◽  
Measuring Installation ◽  
Basic Functions ◽  
Tomography Method ◽  
Dam Monitoring ◽  
The Mathematical Model ◽  
Measurement Line

Numerical modeling of the problem of dam monitoring by the Electrical Resistivity Tomography method is carried out. The mathematical model is based on integral equations with a partial Fourier transform with respect to one spatial variable. It is assumed that the measurement line is located across the dam longitude. To approximate the shape of the dam surface, the Radial Basic Functions method is applied. The influence of locations of the water-dam, dam-basement, basement-leakage boundaries with respect to the sounding installation, which is partially placed under the headwater, is studied. Numerical modeling is carried out for the following varied parameters: 1) water level at the headwater; 2) the height of the leak; 3) the depth of the leak; 4) position of the supply electrode; 5) water level and leaks positions are changing simultaneously. Modeling results are presented in the form of apparent resistivity curves, as it is customary in geophysical practice.

Numerical modeling to well-head protection area delineation, an example in Veneto Region (NE Italy)

2015 ◽  
Vol 35 ◽  
pp. 232-235 ◽  
Author(s):  
Leonardo Piccinini ◽  
Paolo Fabbri ◽  
Marco Pola ◽  
Enrico Marcolongo ◽  
Alessia Rosignoli
Keyword(s):  
Numerical Modeling ◽  
Veneto Region ◽  
Ne Italy ◽  
Head Protection ◽  
Protection Area
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