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The relationship between solar coronal X-ray brightness and active region magnetic fields: a study using high-resolution Hinode observations

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dc.contributor.author Hazra, S
dc.contributor.author Nandy, D
dc.contributor.author Ravindra, B
dc.date.accessioned 2020-11-10T02:29:08Z
dc.date.available 2020-11-10T02:29:08Z
dc.date.issued 2015-03
dc.identifier.citation Solar Physics, Vol. 290, No. 3, pp. 771-785 en_US
dc.identifier.issn 1573-093X
dc.identifier.uri http://prints.iiap.res.in/handle/2248/6727
dc.description Restricted Access © Springer The original publication is available at springerlink.com http://dx.doi.org/10.1007/s11207-015-0652-9 en_US
dc.description.abstract By using high-resolution observations of nearly co-temporal and co-spatial Solar Optical Telescope spectropolarimeter and X-Ray Telescope coronal X-ray data onboard Hinode, we revisit the problematic relationship between global magnetic quantities and coronal X-ray brightness. Co-aligned vector magnetogram and X-ray data were used for this study. The total X-ray brightness over active regions is well correlated with integrated magnetic quantities such as the total unsigned magnetic flux, the total unsigned vertical current, and the area-integrated square of the vertical and horizontal magnetic fields. On accounting for the inter-dependence of the magnetic quantities, we inferred that the total magnetic flux is the primary determinant of the observed integrated X-ray brightness. Our observations indicate that a stronger coronal X-ray flux is not related to a higher non-potentiality of active-region magnetic fields. The data even suggest a slightly negative correlation between X-ray brightness and a proxy of active-region non-potentiality. Although there are small numerical differences in the established correlations, the main conclusions are qualitatively consistent over two different X-ray filters, the Al-poly and Ti-poly filters, which confirms the strength of our conclusions and validate and extend earlier studies that used low-resolution data. We discuss the implications of our results and the constraints they set on theories of solar coronal heating. en_US
dc.language.iso en en_US
dc.publisher Springer en_US
dc.subject Sun: activity en_US
dc.subject Sun: corona en_US
dc.subject Sun: magnetic fields en_US
dc.subject Sun: X-rays, gamma rays en_US
dc.title The relationship between solar coronal X-ray brightness and active region magnetic fields: a study using high-resolution Hinode observations en_US
dc.type Article en_US


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