Some thoughts on emission-line spectroscopy

被引：3

作者：

Judge, Philip G. ^{[1
]}

机构：

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

来源：

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY | 2020年 / 491卷 / 01期

基金：

美国国家科学基金会;

关键词：

line: formation; techniques: spectroscopic; Sun: transition region; EXTREME-ULTRAVIOLET; SOLAR; DIAGNOSTICS; INTENSITIES; SPECTRA; BALANCE;

D O I：

10.1093/mnras/stz3063

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

The interpretation of emission lines formed in large astrophysical plasmas such as the solar atmosphere faces many challenges. Relatively simple line-ratio estimates of physical parameters, while appealing, are heavily laden with assumptions. In practical cases, some critical assumptions are neither defensible from first principles, nor testable by experiment. Free parameters and functional forms must be defined, whose numbers of degrees of freedom exceed the number of independent data points. These issues are illustrated in the particular case of using lines of Si IV and O IV formed in the solar transition region, observed for decades, most recently using the IRIS mission. The problems highlighted are in addition to well-known problems of mathematical ill-posedness.

引用

页码：576 / 579

页数：4

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