Calibration of a ground-based solar coronal polarimeter

被引：56

作者：

Elmore, DF ^{[1
]}

Burkepile, JT ^{[1
]}

Darnell, JA ^{[1
]}

Lecinski, AR ^{[1
]}

Stanger, AL ^{[1
]}

机构：

[1] Natl Ctr Atmospher Res, High Altitude Observ, Boulder, CO 80307 USA

来源：

POLARIMETRY IN ASTRONOMY | 2003年 / 4843卷

关键词：

solar coronagraph; polarimeter;

D O I：

10.1117/12.459279

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

The Mk4 K-coronameter records polarization brightness images of the solar corona from the Mauna Loa Solar Observatory, Hawaii, USA. Calibration is required to quantitatively measure coronal polarization brightness, which in turn is used to infer coronal electron density. Matrix techniques are used to map the instrument polarization response. Brightness scaling depends upon precise knowledge of properties of an opal glass attenuator and calibration polarizer, sky transmission, and telescope pointing. In addition, account must be made for polarization at the objective lens and from the terrestrial atmosphere. Calibration parameters are stable to a few percent over a day, but when coupled with uncertainties in calibration optics values, sky transmission,, and pointing, the average measurement uncertainty is +/-15%+/-6x10(-9) pB/B-Sun.

引用

页码：66 / 75

页数：10