𝔖 Bobbio Scriptorium
✦   LIBER   ✦

An investigation of the linear polarization in emission features of active regions

✍ Scribed by N. M. Firstova

Publisher
Springer
Year
1986
Tongue
English
Weight
557 KB
Volume
103
Category
Article
ISSN
0038-0938

No coin nor oath required. For personal study only.

✦ Synopsis

A study has been made of linear polarization in 'moustaches' using the He and Hfl lines. A Wollaston prism and an achromatic 2/2-plate were employed in the study. In the course of the observations, the major axis of the plate was placed at 0 ~ and 22?5 with respect to the horizontal axis of the installation. The Stokes parameters J, Q, and U were recorded, thus enabling the degree of polarization and the field azimuth to be determined. During the first three minutes of the existence of the moustaches, the two lines revealed a linear polarization of about 7~o located at the center of the lines. No polarization was found during the later stage of the moustaches' lifetimes. Whenever the linear polarization is present, there is a tendency for the polarization to decrease rapidly, in accompaniment of a turning of the azimuth. Several mechanisms for interpreting the polarization observed in the moustaches are examined. Some suggestions are made in support of the excitation of hydrogen atoms in the moustaches initiated by a high-energy electron flux or vertical heat conduction.

πŸ“œ SIMILAR VOLUMES

An investigation of the structure of cor
An investigation of the structure of coronal active regions
✍ J. H. Parkinson πŸ“‚ Article πŸ“… 1973 πŸ› Springer 🌐 English βš– 333 KB

The temperature and density structure of a 'typical' coronal active region is deduced from X-ray observations of several active regions. Observations of the limb transits of three regions from OSO-5 indicate that the X-ray emission originates between 2 x 104 km and 1.5 β€’ 105 km. An emission measure-

Polarization-insensitive wavelength conv
Polarization-insensitive wavelength conversion with a constant output linear polarization allowing the realization of an active polarization controller
✍ H. Soto; D. Erasme; J. Zitlalpopoca πŸ“‚ Article πŸ“… 2001 πŸ› John Wiley and Sons 🌐 English βš– 129 KB

## Abstract In this work, we demonstrate theoretically and experimentally a technique allowing us to realize a polarization‐insensitive wavelength conversion with an output beam whose polarization state is unique and linear for all input signal polarization states. © 2001 John Wiley & Sons, Inc. Mi