scholarly journals Azimuthal dependence of pion source radii inPb+Aucollisions at 158AGeV/c

2008 ◽  
Vol 78 (6) ◽  
Author(s):  
D. Adamová ◽  
G. Agakichiev ◽  
A. Andronic ◽  
D. Antończyk ◽  
H. Appelshäuser ◽  
...  
Keyword(s):  
Azimuthal Dependence

scholarly journals Scattering Calculations for Asymmetric Raindrops during a Line Convection Event: Comparison with Radar Measurements

2018 ◽  
Vol 35 (6) ◽  
pp. 1169-1180 ◽  
Author(s):  
Sanja B. Manić ◽  
Merhala Thurai ◽  
V. N. Bringi ◽  
Branislav M. Notaroš
Keyword(s):  
Rain Event ◽  
Size Distributions ◽  
Surface Integral ◽  
Azimuthal Dependence ◽  
Industry Standard ◽  
Standard Code ◽  
Radar Measurements ◽  
Linear Depolarization Ratio ◽  
Drop Size Distributions ◽  
Differential Reflectivity

AbstractTwo-dimensional video disdrometer (2DVD) data from a line convection rain event are analyzed using the method of moments surface integral equation (MoM-SIE) via drop-by-drop polarimetric scattering calculations at C band that are compared with radar measurements. Drop geometry of asymmetric drop shapes is reconstructed from 2DVD measurements, and the MoM-SIE model is created by meshing the surface of the drop. The differential reflectivity Zdr calculations for an example asymmetric drop are validated against an industry standard code solution at C band, and the azimuthal dependence of results is documented. Using the MoM-SIE analysis on 2DVD drop-by-drop data (also referred to as simply MoM-SIE), the radar variables [Zh, Zdr, Kdp, ρhv] are computed as a function of time (with 1-min resolution) and compared to C-band radar measurements. The importance of shape variability of asymmetric drops is demonstrated by comparing with the traditional (or “bulk”) method, which uses 1-min averaged drop size distributions and equilibrium oblate shapes. This was especially pronounced for ρhv, where the MoM-SIE method showed lowered values (dip) during the passage of the line convection consistent with radar measurements, unlike the bulk method. The MoM-SIE calculations of [Zh, Zdr, Kdp] agree very well with the radar measurements, whereas linear depolarization ratio (LDR) calculations from the drop-by-drop method are found to be larger than the values from the bulk method, which is consistent with the dip in simulated and radar-measured ρhv. Our calculations show the importance of the variance of shapes resulting from asymmetric drops in the calculation of ρhv and LDR.

Comment on azimuthal dependence in leptoproduction

1982 ◽  
Vol 108 (2) ◽  
pp. 131-133
Author(s):  
Atsushi Higuchi
Keyword(s):  
Azimuthal Dependence
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