Boundary Effects and the Circular Polarization of Synchrotron Sources

1978 ◽  
Vol 3 (3) ◽  
pp. 229-231 ◽  
Author(s):  
D. B. Melrose
Keyword(s):  
Synchrotron Radiation ◽  
Circular Polarization ◽  
Boundary Effects ◽  
Circular Component

Some self-absorbed synchrotron sources have, a small but observable degree of circular polarization rc near the absorption turnover (Roberts et al. 1975). The simplest interpretation of the circular component is in terms of the intrinsic degree of circular polarization of synchrotron radiation (Legg and Westfold 1968); this provides a relation (Roberts et al. 1975)

On the Polarization and Rapid Fade-out of Moving Type IV Solar Bursts

1970 ◽  
Vol 1 (8) ◽  
pp. 372-374 ◽  
Author(s):  
G. A. Dulk
Keyword(s):  
Synchrotron Radiation ◽  
Circular Polarization ◽  
Source Region ◽  
Relativistic Electrons ◽  
Constant Intensity ◽  
Precise Position ◽  
Polarization Measurements ◽  
Type Iv ◽  
Solar Bursts

Since the advent of the 80 MHz radioheliograph, precise position and polarization measurements have become available on several moving type IV bursts. Two of the more puzzling characteristics of these bursts are : (1) they exhibit strong circular polarization in parts or all of the source region ; (2) after moving outward to as much as 3 R⊙ with relatively constant intensity, they rapidly fade away. In this paper we discuss the polarization and intensity of synchrotron radiation from mildly relativistic electrons and suggest betatron deceleration as a mechanism to explain the rapid fade-out of the moving type IV sources. The results are applied to two examples of moving type IV bursts.

Observation of Strong Circular Polarization in a Moving Type IV Burst

1969 ◽  
Vol 1 (5) ◽  
pp. 189-191 ◽  
Author(s):  
K. Kai
Keyword(s):  
Synchrotron Radiation ◽  
Magnetic Fields ◽  
Solar Corona ◽  
Circular Polarization ◽  
Type Iv ◽  
Weak Magnetic Fields

Since they were first interpreted, moving type IV bursts have been attributed to synchrotron radiation from electrons with energy ∼3 MeV radiating in weak magnetic fields (∼1 G) high in the solar corona. In this paper a description is given of 80 MHz radioheliograph observations of an outburst in which it was possible to isolate the moving type IV source and demonstrate that its circular polarization was strong (∼80%). Hence it is shown that the energy of the radiating electrons cannot exceed 6 = 105eV.

First direct measurement of the circular polarization of synchrotron radiation close to the carbon K‐edge

1993 ◽  
Vol 6 (2) ◽  
pp. 16-18 ◽  
Author(s):  
S. Di Fonzo ◽  
W. Jark ◽  
F. Schafers ◽  
H. Petersen ◽  
A. Gaupp ◽  
...  
Keyword(s):  
Synchrotron Radiation ◽  
Circular Polarization ◽  
Direct Measurement

Radio Emission from Starspots on RSCVn Binary HR1099

1986 ◽  
Vol 6 (3) ◽  
pp. 316-319 ◽  
Author(s):  
John D. Bunton ◽  
R. T. Stewart ◽  
O. B. Slee ◽  
G. J. Nelson ◽  
Alan E. Wright ◽  
...  
Keyword(s):  
Synchrotron Radiation ◽  
Magnetic Fields ◽  
Radio Emission ◽  
Light Curve ◽  
Circular Polarization ◽  
Rotation Rate ◽  
Source Model ◽  
Microwave Emission ◽  
Relativistic Electrons ◽  
Synchrotron Source

AbstractProperties of the microwave emission from HR1099 are examined in an attempt to determine whether the emission arises as gyro-synchrotron radiation from mildly relativistic electrons trapped in magnetic fields above starspots on the active K subgiant component. It is shown that radio curves do not exhibit a systematic variation in phase with the rotation rate, as one might expect for emission from a source situated above a long-lived starspot. However, there is some evidence that the radio flaring occurs at two preferred longitude zones. Whether these zones agree with starspot locations remains to be determined by light curve modelling. What we can say with confidence is that the measured spectral index of the microwave emission does not fit a simple gyro-synchrotron source model, such as that proposed to explain the observed reversal with frequency of the sense of circular polarization.

An essential property of synchrotron radiation: linear and circular polarization for X-ray absorption spectroscopy

1992 ◽  
Vol 2 (6) ◽  
pp. 1233-1255 ◽  
Author(s):  
E. Dartyge ◽  
A. Fontaine ◽  
F. Baudelet ◽  
C. Giorgetti ◽  
S. Pizzini ◽  
...  
Keyword(s):  
Synchrotron Radiation ◽  
Circular Polarization ◽  
Absorption Spectroscopy ◽  
Essential Property ◽  
X Ray ◽  
X Ray Absorption
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