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Title: Elemental abundances in the solar corona as measured by the X-ray solar monitor onboard Chandrayaan-1
Authors: Narendranath, S
Sreekumar, P
Alha, L
Sankarasubramanian, K
Huovelin, J
Athiray, P. S
Keywords: Flares;Spectrum;X-ray
Issue Date: May-2014
Publisher: Springer
Citation: Solar Physics, Vol. 289, No. 5, pp. 1585-1595
Abstract: 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.
Description: Restricted Access
The original publication is available at
ISSN: 1573-093X
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Appears in Collections:IIAP Publications

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