Ultra-high-resolution observations of persistent null-point reconnection in the solar corona - Département de physique Access content directly
Journal Articles Nature Communications Year : 2023

Ultra-high-resolution observations of persistent null-point reconnection in the solar corona

X. Cheng
E. Priest
  • Function : Author
H. Li
L. Chitta
Y. Wang
H. Peter
X. Zhu
  • Function : Author
C. Xing
  • Function : Author
M. Ding
S. Solanki
L. Teriaca
R. Aznar Cuadrado
Y. Guo
D. Long
P. Smith
C. Verbeeck
K. Barczynski

Abstract

Magnetic reconnection is a key mechanism involved in solar eruptions and is also a prime possibility to heat the low corona to millions of degrees. Here, we present ultra-high-resolution extreme ultraviolet observations of persistent null-point reconnection in the corona at a scale of about 390 km over one hour observations of the Extreme-Ultraviolet Imager on board Solar Orbiter spacecraft. The observations show formation of a null-point configuration above a minor positive polarity embedded within a region of dominant negative polarity near a sunspot. The gentle phase of the persistent null-point reconnection is evidenced by sustained point-like high-temperature plasma (about 10 MK) near the null-point and constant outflow blobs not only along the outer spine but also along the fan surface. The blobs appear at a higher frequency than previously observed with an average velocity of about 80 km s −1 and life-times of about 40 s. The null-point reconnection also occurs explosively but only for 4 minutes, its coupling with a mini-filament eruption generates a spiral jet. These results suggest that magnetic reconnection, at previously unresolved scales, proceeds continually in a gentle and/or explosive way to persistently transfer mass and energy to the overlying corona.
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Origin : Publication funded by an institution

Dates and versions

hal-04327021 , version 1 (28-02-2024)

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X. Cheng, E. Priest, H. Li, J. Chen, Guillaume Aulanier, et al.. Ultra-high-resolution observations of persistent null-point reconnection in the solar corona. Nature Communications, 2023, 14 (1), pp.2107. ⟨10.1038/s41467-023-37888-w⟩. ⟨hal-04327021⟩
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