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- W4206042015 abstract "Abstract In this study, we analyze high-spatial-resolution (0.″24) magnetograms and high-spatial-resolution (0.″10) H α off-band (± 0.8 Å) images taken by the 1.6 m Goode Solar Telescope to investigate the magnetic properties associated with small-scale ejections in a coronal hole boundary region from a statistical perspective. With one and a half hours of optical observations under excellent seeing, we focus on the magnetic structure and evolution by tracking the magnetic features with the Southwest Automatic Magnetic Identification Suite (SWAMIS). The magnetic field at the studied coronal hole boundary is dominated by negative polarity with flux cancellations at the edges of the negative unipolar cluster. In a total of 1250 SWAMIS-detected magnetic cancellation events, ∼39% are located inside the coronal hole with an average flux cancellation rate of 2.0 × 10 18 Mx Mm −2 hr −1 , and ∼49% are located outside the coronal hole with an average flux cancellation rate of 8.8 × 10 17 Mx Mm −2 hr −1 . We estimated that the magnetic energy released due to flux cancellation inside the coronal hole is six times more than that outside the coronal hole. Flux cancellation accounts for ∼9.5% of the total disappearance of magnetic flux. Other forms of its disappearance are mainly due to fragmentation of unipolar clusters or merging with elements of the same polarity. We also observed a number of significant small-scale ejections associated with magnetic cancellations at the coronal hole boundary that have corresponding EUV brightenings." @default.
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- W4206042015 date "2022-01-01" @default.
- W4206042015 modified "2023-10-10" @default.
- W4206042015 title "A High-resolution Study of Magnetic Field Evolution and Spicular Activity around the Boundary of a Coronal Hole" @default.
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- W4206042015 doi "https://doi.org/10.3847/1538-4357/ac374e" @default.
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