Newly Discovered Global Temperature Structures in the Quiet Sun at Solar Minimum
Zhenguang Huang, Richard A. Frazin, Enrico Landi, Ward B. Manchester, IV, Alberto M. V\'asquez, Tamas I. Gombosi

TL;DR
This study introduces a novel technique combining tomography and magnetic modeling to identify and analyze quiet Sun coronal loops during solar minimum, revealing unexpected temperature structures that inform coronal heating physics.
Contribution
The paper presents the Michigan Loop Diagnostic Technique (MLDT), a new method integrating DEMT and PFSS models to study quiet Sun loops at an unprecedented level of detail.
Findings
Identification of two types of quiet Sun loops: up and down loops.
Discovery of ubiquitous down loops in the low-latitude corona.
Robustness of results despite instrument calibration uncertainties.
Abstract
Magnetic loops are building blocks of the closed-field corona. While active region loops are readily seen in images taken at EUV and X-ray wavelengths, quiet Sun loops are seldom identifiable and therefore difficult to study on an individual basis. The first analysis of solar minimum (Carrington Rotation 2077) quiet Sun (QS) coronal loops utilizing a novel technique called the Michigan Loop Diagnostic Technique (MLDT) is presented. This technique combines Differential Emission Measure Tomography (DEMT) and a potential field source surface (PFSS) model, and consists of tracing PFSS field lines through the tomographic grid on which the Local Differential Emission Measure (LDEM) is determined. As a result, the electron temperature Te and density Ne at each point along each individual field line can be obtained. Using data from STEREO/EUVI and SOHO/MDI, the MLDT identifies two types of QS…
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