Multispacecraft Observations of Coronal Loops to Verify a Force-free Field Reconstruction and Infer Loop Cross Sections
نویسندگان
چکیده
Active region EUV loops are believed to trace a subset of magnetic field lines through the corona. Malanushenko et al. (2009) proposed method, using loop images and line-of-sight photospheric magnetograms, infer three-dimensional shape strength along each loop. McCarthy (2019) used this novel method compute total flux interconnecting pair active regions observed by SDO/AIA. They adopted common assumption that had circular cross section. The accuracy inferred circularity sections can both be tested observations same from additional vantage points as provided STEREO/EUVI. Here, we use multiple viewing angles confirm structure loops. Of 151 viable cases, 105 (69.5%) matched some form visible coronal when viewed approximately in quadrature. A with cross-section should appear similar width different perspectives. In contradiction this, find puzzling lack correlation between diameters seen perspectives, even an anti-correlation cases. Features identified monolithic AIA may, fact, more complex density enhancements. 30.5% reconstructions which did not match any feature EUVI might such Others may genuine structures, but elliptical sections. We observe diameter brightness, lending support latter hypothesis. 13 suitable for analysis, four consistent non-circular sections, where comparisons.
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ژورنال
عنوان ژورنال: The Astrophysical Journal
سال: 2021
ISSN: ['2041-8213', '2041-8205']
DOI: https://doi.org/10.3847/1538-4357/abf4d5