scholarly journals Pulsar Polarimetry – New Aspects at High Radio Frequencies

2000 ◽  
Vol 177 ◽  
pp. 267-268
Author(s):  
Alexis von Hoensbroech
Keyword(s):  
Circular Polarization ◽  
Basic Concept ◽  
Degree Of Polarization ◽  
Clear Correlation ◽  
Physical Processes ◽  
Polarization States ◽  
Radio Frequencies ◽  
Propagation Scenario ◽  
Straightforward Interpretation

AbstractPulsar polarimetry is an important tool for the investigation of the physical processes and the environment in the magnetosphere. However, the great variety of observed polarization states and the few obvious systematics hamper a straightforward interpretation. In this paper it is shown that the polarimetric features of pulsars are much more systematic at high radio frequencies. An analysis of 116 profiles at 4.85 GHz reveals a clear correlation between the degree of polarization andĖ. Also evidence is shown for pulsars with a heavily increasing degree of circular polarization. Further, a basic concept of a simple magnetospheric propagation scenario is presented, which can account for a variety of polarimetric properties of pulsars.

scholarly journals A New Diminutive Octa Polarization Reconfigurable Circular Patch Antenna

2020 ◽  
Vol 9 (6) ◽  
pp. 775-779
Keyword(s):  
Circular Polarization ◽  
Patch Antenna ◽  
Prototype Model ◽  
Rf Switch ◽  
Left Hand ◽  
Circular Patch ◽  
Compact Size ◽  
Circular Patch Antenna ◽  
Polarization States ◽  
The Right

This proposes a new diminutive octa polarization reconfigurable circular patch antenna design. This new antenna can operate in eight different polarizing states (6 different angles of linear polarization and 2 circular polarization states) with the help of a reconfigurable probe feed network. The antenna comprises of a circular layer of radiation with four equally spaced slits at the boundary of the circular patch to obtain size reduction. The bias voltages of six pairs of PIN diodes are interval between each state. A 3 dB hybrid coupler and a RF switch are used to produce reconfiguration between circular polarization states of the right and left hand. The proposed antenna was designed using CST microwave studio, fabricated as a prototype model and tested which produces desired values for various parameters of antenna including compact size. The designed antenna operates within 2.4-2.5 GHz frequencies suitable for wireless applications

scholarly journals Stable UV to IR supercontinuum generation in calcium fluoride with conserved circular polarization states

2009 ◽  
Vol 17 (24) ◽  
pp. 21488 ◽  
Author(s):  
Philip J. M. Johnson ◽  
Valentyn I. Prokhorenko ◽  
R. J. Dwayne Miller
Keyword(s):  
Circular Polarization ◽  
Calcium Fluoride ◽  
Supercontinuum Generation ◽  
Polarization States

Observed Limits to the Circular Polarization of Nine Quasars at Radio Frequencies

Nature ◽  
1968 ◽  
Vol 218 (5136) ◽  
pp. 73-73 ◽  
Author(s):  
M. M. KOMESAROFF ◽  
F. F. GARDNER ◽  
D. MORRIS ◽  
J. A. ROBERTS ◽  
J. B. WHITEOAK
Keyword(s):  
Circular Polarization ◽  
Radio Frequencies

Disorientation of Na(32P1/2) Atoms, Induced in Collisions with Noble Gases

1974 ◽  
Vol 52 (20) ◽  
pp. 1956-1960 ◽  
Author(s):  
B. Niewitecka ◽  
T. Skaliński ◽  
L. Krause
Keyword(s):  
Circular Polarization ◽  
Cross Sections ◽  
Nuclear Spin ◽  
Noble Gas ◽  
Gas Pressure ◽  
Degree Of Polarization ◽  
Low Density ◽  
Resonance Fluorescence ◽  
Sodium Vapor ◽  
Circularly Polarized

The cross sections for disorientation of 32P1/2 sodium atoms, induced in collisions with noble gas atoms, have been determined by following the depolarization of Na–D1 resonance fluorescence in relation to noble gas pressure. Sodium vapor at low density, mixed with a noble gas in a fluorescence cell, was irradiated with circularly polarized D1 resonance radiation and the resulting D1 resonance fluorescence, observed in an approximately backward direction, was analyzed with respect to circular polarization. The variation of the degree of polarization with gas pressure was interpreted on the basis of a 'J randomization' model for the collisions, and yielded the following disorientation cross sections which are appropriately corrected for effects due to nuclear spin. Na–He: 28.1 ± 4.0 Å2; Na–Ne: 27.8 ± 4.0 Å2; Na–Ar: 57.0 ± 8.0 Å2; Na–Kr: 78.0 ± 10 Å2; Na–Xe: 87.0 ± 13 Å2.

FeXIV Line Emission Polarization of the July 11, 1991 Solar Corona

1994 ◽  
Vol 144 ◽  
pp. 541-547
Author(s):  
J. Sýkora ◽  
J. Rybák ◽  
P. Ambrož
Keyword(s):  
High Resolution ◽  
Solar Corona ◽  
Emission Line ◽  
Solar Eclipse ◽  
White Light ◽  
Preliminary Analysis ◽  
Line Emission ◽  
Total Solar Eclipse ◽  
Degree Of Polarization ◽  
High Resolution Images

AbstractHigh resolution images, obtained during July 11, 1991 total solar eclipse, allowed us to estimate the degree of solar corona polarization in the light of FeXIV 530.3 nm emission line and in the white light, as well. Very preliminary analysis reveals remarkable differences in the degree of polarization for both sets of data, particularly as for level of polarization and its distribution around the Sun’s limb.

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