Elemental Abundances in the Solar Corona as Measured by the X-ray Solar Monitor Onboard Chandrayaan-1

被引：0
|
作者：
S. Narendranath
P. Sreekumar
L. Alha
K. Sankarasubramanian
J. Huovelin
P. S. Athiray
机构：
[1] ISRO,Space Astronomy Group
[2] Indian Institute of Astrophysics,Division of Geophysics and Astronomy, Department of Physics
[3] University of Helsinki,undefined
来源：
Solar Physics | 2014年 / 289卷
关键词：
Flares, spectrum; X-ray;
D O I：
暂无
中图分类号：
学科分类号：
摘要：
The X-ray Solar Monitor (XSM) on the Indian lunar mission Chandrayaan-1 was flown to complement lunar elemental abundance studies by the X-ray fluorescence experiment C1XS. XSM measured the ≈ 1.8 – 20 keV solar X-ray spectrum during its nine months of operation in lunar orbit. The soft X-ray spectra can be used to estimate absolute coronal abundances using intensities of emission-line complexes and the plasma temperature derived from the continuum. The best estimates are obtained from the brightest flare observed by XSM: a C2.8-class flare. The well-known first-ionization potential (FIP) effect is observed; abundances are enhanced for the low-FIP elements Fe, Ca, and Si, while the intermediate-FIP element S shows values close to the photospheric abundance. The derived coronal abundances show a quasi-mass-dependent pattern of fractionation.
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页码：1585 / 1595
页数：10
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