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20 April 2024 |
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Solar coronal loops associated with small-scale mixed polarity surface magnetic fields | | L. P. Chitta
; H. Peter
; S. K. Solanki
; P. Barthol
; A. Gandorfer
; L. Gizon
; J. Hirzberger
; T. L. Riethmueller
; M. van Noort
; J. Blanco Rodriguez
; J. C. Del Toro Iniesta
; D. Orozco Suarez
; W. Schmidt
; V. Martinez Pillet
; M. Knoelker
; | | Date: |
24 Oct 2016 | | Abstract: | How and where are coronal loops rooted in the solar lower atmosphere? The
details of the magnetic environment and its evolution at the footpoints of
coronal loops are crucial to understanding the processes of mass and energy
supply to the solar corona. To address the above question, we use high
resolution line-of-sight magnetic field data from the Imaging Magnetograph
eXperiment (IMaX) instrument on the Sunrise balloon-borne observatory and
coronal observations from the Atmospheric Imaging Assembly (AIA) onboard the
Solar Dynamics Observatory (SDO) of an emerging active region. We find that the
coronal loops are often rooted at the locations with minor small-scale but
persistent opposite polarity magnetic elements very close to the larger
dominant polarity. These opposite polarity small-scale elements continually
interact with the dominant polarity underlying the coronal loop through flux
cancellation. At these locations we detect small inverse Y-shaped jets in
chromospheric Ca II H images obtained from the Sunrise Filter Imager (SuFI)
during the flux cancellation. Our results indicate that magnetic flux
cancellation and reconnection at the base of coronal loops due to
mixed-polarity fields might be a crucial feature for the supply of mass and
energy into the corona. | | Source: | arXiv, 1610.7484 | | Services: | Forum | Review | PDF | Favorites | |
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