2016
DOI: 10.3847/0004-637x/831/1/10
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Explaining Inverted-Temperature Loops in the Quiet Solar Corona With Magnetohydrodynamic Wave-Mode Conversion

Abstract: Coronal loops trace out bipolar, arch-like magnetic fields above the Sun's surface. Recent measurements that combine rotational tomography, extreme ultraviolet imaging, and potential-field extrapolation have shown the existence of large loops with inverted temperature profiles; i.e., loops for which the apex temperature is a local minimum, not a maximum. These "down loops" appear to exist primarily in equatorial quiet regions near solar minimum. We simulate both these and the more prevalent large-scale "up loo… Show more

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Cited by 6 publications
(7 citation statements)
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“…DEMT studies provide a time-averaged description of the state of the corona during the observing time of each structure (∼ 1/2 solar rotation). The new results of this study are to be interpreted in this context, and can be compared with steady-state models of largescale coronal structures, such as those recently developed by Schiff & Cranmer (2016), who sucessfully reproduced the up/down loops reported by Huang et al (2012); Nuevo et al (2013), and studied here in Section 5.3.…”
Section: Discussionmentioning
confidence: 58%
See 1 more Smart Citation
“…DEMT studies provide a time-averaged description of the state of the corona during the observing time of each structure (∼ 1/2 solar rotation). The new results of this study are to be interpreted in this context, and can be compared with steady-state models of largescale coronal structures, such as those recently developed by Schiff & Cranmer (2016), who sucessfully reproduced the up/down loops reported by Huang et al (2012); Nuevo et al (2013), and studied here in Section 5.3.…”
Section: Discussionmentioning
confidence: 58%
“…Down loops were first predicted by Serio et al (1981), and later on by Aschwanden & Schrijver (2002). In a recent study by Schiff & Cranmer (2016), down and up loops have been successfully reproduced by a numerical implementation of a 1D steady state model that considers time-averaged heating rates. The analysis of these structures in the context of the new tool here developed is shown in Section 5.3 below.…”
Section: Results For Cr-2081mentioning
confidence: 95%
“…We note that flux emergence is an alternative candidate for the coronal heat source (Schrijver et al 1998;Wang 2020Wang , 2022. For energy dissipation, several mechanisms are proposed, including magnetic-field braiding (Parker 1972(Parker , 1983(Parker , 1988Sturrock & Uchida 1981;Berger 1991), resonant absorption (Erdelyi & Goossens 1995;Terradas et al 2010;Goossens et al 2011), phase mixing (Heyvaerts & Priest 1983;De Moortel et al 2000;Goossens et al 2012), shock formation (Moriyasu et al 2004;Antolin et al 2008;Schiff & Cranmer 2016), and turbulence (van Ballegooijen et al 2011(van Ballegooijen et al , 2014Matsumoto 2018;Shoda & Takasao 2021). From the observational point of view, coronal heating is often discussed in terms of thermal response, in particular the differential emission measure (e.g., Aschwanden & Parnell 2002;Warren et al 2012;Shoda & Takasao 2021).…”
Section: Introductionmentioning
confidence: 95%
“…Such structures are expected where heating is strongly enhanced at the coronal base. This has been explored by Schiff and Cranmer (2016), who used a 1D model to simulate down loops by including coronal heating dissipation of compressive waves formed by mode conversion from an initial population of Alfvén waves, a physical mechanism originally proposed by Nuevo et al (2013). Second, as in previous DEMT studies, the reconstructions reveal that the coronal plasma is ubiquitously characterized by a significant local temperature spread within the ∼10 4 km linear size of the tomography computational cell (Vásquez, 2016).…”
Section: Discussionmentioning
confidence: 98%
“…Such structures are expected where heating is strongly enhanced at the coronal base. This has been explored by Schiff and Cranmer (2016), who used a 1D model to simulate down loops by including coronal heating dissipation of compressive waves formed by mode conversion from an initial population of Alfvén waves, a physical mechanism originally proposed by Nuevo et al. (2013).…”
Section: Discussionmentioning
confidence: 99%