On the Intermittency of Hot Plasma Loops in the Solar Corona

A recent analysis has suggested that the heating of plasma loops in the solar corona depends not just on the Poynting flux but also on processes yet to be identified. This discovery reflects and refines earlier questions such as, Why and how are entire hydromagnetic structures only intermittently lo...

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Bibliographic Details
Published in:The Astrophysical journal 2024-08, Vol.970 (2), p.130
Main Authors: Judge, Philip G., Kuin, N. Paul M.
Format: Article
Language:English
Subjects:
Active Sun
Chromosphere
Corona
Coronal heating
Coronal loops
Heating
Magnetic fields
Plasma
Solar active region magnetic fields
Solar chromosphere
Solar corona
Solar coronal heating
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Summary:A recent analysis has suggested that the heating of plasma loops in the solar corona depends not just on the Poynting flux but also on processes yet to be identified. This discovery reflects and refines earlier questions such as, Why and how are entire hydromagnetic structures only intermittently loaded with bright coronal plasma? The present work scrutinizes more chromospheric and coronal data, with the aim of finding reproducible observational constraints on coronal heating mechanisms. Six independent scans of chromospheric active-region magnetic fields are investigated and correlated to overlying hot plasma loops. For the first time, the footpoints of over 30 bright plasma loops are thus related to scalar proxies for the Poynting fluxes measured from the upper chromosphere. Although imperfect, the proxies all indicate a general lack of correlation between footpoint Poynting flux and loop brightness. Our findings consolidate the claim that unobserved physical processes are at work, which govern the heating of long-lived coronal loops.
ISSN:0004-637X
1538-4357
DOI:10.3847/1538-4357/ad5202