SPACELAB-2 MEASUREMENT OF THE SOLAR CORONAL HELIUM ABUNDANCE

被引：34

作者：

GABRIEL, AH

CULHANE, JL

PATCHETT, BE

BREEVELD, ER

LANG, J

PARKINSON, JH

PAYNE, J

NORMAN, K

机构：

[1] UCL, MULLARD SPACE SCI LAB, HOLMBURY ST MARY RH5 6NT, ENGLAND

[2] RUTHERFORD APPLETON LAB, DIDCOT OX11 0QX, OXON, ENGLAND

来源：

ELEMENT ABUNDANCE VARIATIONS IN THE SUN AND HELIOSPHERE | 1995年 / 15卷 / 07期

关键词：

D O I：

10.1016/0273-1177(94)00020-2

中图分类号：

V [航空、航天];

学科分类号：

08 ; 0825 ;

摘要：

The abundance of helium relative to hydrogen has been measured with the ''Coronal Helium Abundance Spacelab Experiment'' (CHASE) from the space shuttle Challenger in 1985. Previous solar measurements have proved difficult due to the temperature-sensitivity of the electron excitation rates for the observed lines. In this approach scattered Lyman Alpha (Ly alpha) radiation of helium and hydrogen formed in the corolla were measured with a grazing-incidence spectrometer and compared with the intensity of the illuminating flux from the solar chromosphere. The abundance ratio by number of atoms was found to be 0.070 with an uncertainty of 0.011. Scattered light in the telescope is the main source of error.

引用

页码：63 / 67

页数：5

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