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Solar coronal abundances: Some recent X‐ray flare observations

 

作者: Alphonse C. Sterling,  

 

期刊: AIP Conference Proceedings  (AIP Available online 1996)
卷期: Volume 374, issue 1  

页码: 343-352

 

ISSN:0094-243X

 

年代: 1996

 

DOI:10.1063/1.50969

 

出版商: AIP

 

数据来源: AIP

 

摘要:

I review recent elemental abundance studies from X‐ray flare spectra obtained with Bragg crystal spectrometer experiments on board theSMM,P78‐1, andYohkohspacecraft. Using the line‐to‐continuum method, data from all three satellites indicate an enhancement of the abundance of low‐FIP Ca relative to H. But the average magnitude of the enhancement is somewhat uncertain. Flare‐to‐flare variations in the enhancement are also seen. Fe flare abundances seem to be close to photospheric values, with differing methods giving somewhat differing values. These findings, in conjunction with results forS, leave open the possibility thatHmay behave as an intermediate‐FIP element or that a more complex characterization may apply. Further studies of theYohkohdata, and studies comparing different analysis methods are needed to clarify these issues. ©1996 American Institute of Physics.

 

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