| Original Articles |
|
|
|
|
Approximate Expression of Ellipse Polarization Degree for Gyrosynchrotron Radiation |
| ZHOU Ai-Hua |
| Purple Mountain Observatory, Chinese Academy of Sciences, Nanjing 210008
National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100012 |
|
| Cite this article: |
|
ZHOU Ai-Hua 2002 Chin. Phys. Lett. 19 144-146 |
|
|
|
|
Abstract We study the elliptical polarization degree (EPD) of gyrosynchrotron radiation for the case of transverse propagation. The EPD decreases with increasing ellipticity R (i.e., ratio of the major and miner axial lenths) and with decreasing electron energy spectral index δ. The EPD value varies from 0.55 to 0.15 in the whole range of 3 ≤ R ≤ 10 and 2 ≤ δ ≤ 7. An approximate expression for the EPD is proposed, in which we assume that the emitting electrons have an isotropic pitch angle distribution and a power law distribution in energy. The expression is designed for the electron energy spectral index δ from 2 to 7, as well as the harmonic numbers s from 2 to 70 with a statistical error of ±6%. The expression can be applied to the polarization analysis and magnetic field strength diagnostic for solar limb events.
|
| Keywords:
96.60.-j
96.60.Rd
96.60.Hv
|
|
|
Published: 01 January 2002
|
|
|
|
|
|
|
|
|
Viewed |
|
|
|
Full text
|
|
|
|
|
Abstract
|
|
|
|
|
