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SUMMARY:Examining the Closed Magnetic Field Lines Crossing the Coronal Hol
 e Boundaries
DTSTART;VALUE=DATE-TIME:20230511T075500Z
DTEND;VALUE=DATE-TIME:20230511T081000Z
DTSTAMP;VALUE=DATE-TIME:20240704T115652Z
UID:indico-contribution-342@meetings.aip.de
DESCRIPTION:Speakers: Chia-Hsien Lin (Department of Space Science and Engi
 neering\, National Central University)\nSolar coronal holes (CHs) are the 
 regions with low coronal emissions and an unbalanced magnetic flux\, which
  led to the common expectation that their magnetic structures are mostly `
 `open''\, or\, in other words\, extending to infinity. The objective of th
 is study is to examine the CH magnetic structures to verify this expectati
 on. The coronal holes are identified from the synoptic maps constructed us
 ing the AIA 193 images and HMI line-of-sight magnetograms from 2010 June t
 o 2020 February. The magnetic structures of the CHs are constructed using 
 the Potential Field Source Surface (PFSS) model. As a comparison\, the dat
 a from a thermodynamic magnetohydrodynamic (MHD) model are also used. The 
 results from both models reveal that there is a significant percentage of 
 closed field lines extending beyond the CH boundaries\, leading to an unba
 lanced magnetic flux within the boundaries. The boundary-crossing field li
 nes tend to be located slightly closer to the CH boundaries\, and are more
  likely to be found in the lower latitudes during active times. The result
 s also show that more than 50% (17%) of PF (MHD) CHs do not contain open m
 agnetic field lines. The CHs without open field lines are often smaller an
 d less unipolar than those with open field lines.\n\nhttps://meetings.aip.
 de/event/24/contributions/342/
LOCATION:Haus H\, Telegrafenberg
URL:https://meetings.aip.de/event/24/contributions/342/
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