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Mini statistical study of chemical composition in solar active regions

Authors: Mihailescu, Teodora; Baker, Deborah; Van Driel-Gesztelyi, Lidia; Green, Lucie M.; Brooks, David H.; Long, David;

Mini statistical study of chemical composition in solar active regions

Abstract

In the solar corona, elements with a low first ionisation potential (FIP) have been observed to have an increased abundance compared to the photosphere. This phenomenon is known as the FIP effect and the degree of enhancement is measured using the FIP bias parameter. In this study, the first full Sun FIP bias map, taken between 16-18 January 2013, is analysed to produce a mini statistical study of metal enhancement in the corona in the 9 active regions present on the surface of the Sun at the time. Results showed that the FIP bias is linked to three main factors. First, FIP bias was observed to increase with the total magnetic flux of the active region. Second, the following polarity was observed to have a higher FIP bias than the leading polarity. This could be explained by the magnetic field being more dispersed in the following than the leading polarity. Third, the FIP bias dependence with magnetic flux density was found to increase with magnetic flux density in the low magnetic flux density region, but then decrease in the regions of very concentrated magnetic field, i.e. regions with sunspots.

Keywords

plasma composition, FIP bias, active region evolution

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selected citations
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This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
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popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
BIP!Popularity provided by BIP!
influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Influence provided by BIP!
impulse
This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
BIP!Impulse provided by BIP!
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