Some issues in diagnostics of solar chromospheric magnetic fields with the Mg b2 line

被引：1
|
作者：
Bai, Xian-Yong [1 ,2 ]
Deng, Yuan-Yong [1 ]
Su, Jiang-Tao [1 ,3 ]
Wang, Guo-Ping [1 ]
机构：
[1] Chinese Acad Sci, Natl Astron Observ, Key Lab Solar Act, Beijing 100012, Peoples R China
[2] Univ Chinese Acad Sci, Beijing 100049, Peoples R China
[3] Chinese Acad Sci, State Key Lab Space Weather, Beijing 100190, Peoples R China
来源：
RESEARCH IN ASTRONOMY AND ASTROPHYSICS | 2014年 / 14卷 / 02期
基金：
中国国家自然科学基金;
关键词：
Sun: chromospheric; magnetic fields; spectral profiles: radiative transfer; STOKES PROFILE ANALYSIS; ACTIVE-REGION FILAMENT; SPECTRAL-LINE; VECTOR; POLARIZATION; SUN; NM; MAGNETOGRAMS; TELESCOPE; INVERSION;
D O I：
10.1088/1674-4527/14/2/007
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
Up to now, exact measurements of chromospheric magnetic fields have not been as successful as those done in the photosphere. We are currently engaging in diagnostics of chromospheric magnetic fields with the Mg b(2) line by employing the Multi-Channel Solar Telescope at Huairou Solar Observing Station. Therefore, how to improve accuracy in the measurement is the main issue of our present study. To this end, we first study linear calibration coefficients for longitudinal and transverse components of chromospheric fields, which vary with wavelength, in the case of a weak field assumption. Then the polarization crosstalk introduced by instruments is analyzed in detail with two numerical simulation methods. Comparisons of the polarization signals between cases with and without correction are presented. The result indicates that polarization accuracy is greatly improved after crosstalk correction.
引用
收藏
页码：193 / 206
页数：14
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