Comparison of the On-disk Apparent Current Sheets with the Limb Ones
Astrophysical Journal, ISSN: 1538-4357, Vol: 974, Issue: 1
2024
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Article Description
Based on observations from the Solar Dynamics Observatory (SDO) and the Solar and Heliospheric Observatory (SOHO), we investigate 30 apparent current sheets during 1999-2021, including 10 on-disk and 8 limb ones from the SDO, as well as 12 limb ones from the SOHO. Each on-disk current sheet is formed among an X-type configuration consisting of two sets of atmospheric structures, and each limb one is involved in a flare-coronal mass ejection event. During magnetic reconnection period, the on-disk apparent current sheet evolves from a bright point to an elongated line-like structure, and the structure becomes thin in the late stage of the reconnection. Subsequently, the plasma distribution within the current sheet manifests as a plasmoid chain. For the limb apparent current sheet, the length elongation is faster than that of the on-disk one, and the thinning process is also detected. Although the aspect ratios of the limb cases are comparable to the value for the occurrence of tearing mode instability from simulation research, no obvious plasmoid chain is detected within these limb current sheets, and the density distribution is locally uniform. We suggest that due to the rapid extension of limb cases, the tearing mode instability is very fast, resulting in the formation of tiny plasmoids that are smaller than the instrument resolution. Moreover, there is another possible scenario. The observed limb apparent current sheet is just a bright ray, and the actual current sheet is only a small segment of the ray.
Bibliographic Details
http://www.scopus.com/inward/record.url?partnerID=HzOxMe3b&scp=85206451365&origin=inward; http://dx.doi.org/10.3847/1538-4357/ad6df5; https://iopscience.iop.org/article/10.3847/1538-4357/ad6df5; https://dx.doi.org/10.3847/1538-4357/ad6df5; https://validate.perfdrive.com/9730847aceed30627ebd520e46ee70b2/?ssa=9867352b-28f9-4362-affb-8c1a9aa03123&ssb=03002200559&ssc=https%3A%2F%2Fiopscience.iop.org%2Farticle%2F10.3847%2F1538-4357%2Fad6df5&ssi=ba61c81a-cnvj-4b88-b2d3-04b3c226280f&ssk=botmanager_support@radware.com&ssm=218896799935502881203676059860068014&ssn=be620a6e73f3445776ef74c6d0f239dddd2a6402f074-4cb6-43cc-b1df60&sso=91e465d5-86644739f8a5aed059f1e571f8cfca2d76904f5f6fdf0c6a&ssp=72498336141728611139172949353913933&ssq=02568702730942089579575883960921828766465&ssr=MzQuMjM2LjI2LjMx&sst=com.plumanalytics&ssu=&ssv=&ssw=&ssx=eyJ1em14IjoiN2Y5MDAwNTIwMjU5NjctODczMS00OWRlLTg2NDgtY2NlNTViOWU0YmFjMTAtMTcyODY3NTg4MzQzNjc1MTQyNTc4OC0yMzU3ODI3ODgwZmUyNWIxMTIwMzQ5IiwiX191em1mIjoiN2Y2MDAwMDE5MGI0MzAtODcxZS00YzhhLTg4YzUtYTkyOWRkOTUwYWM5MTcyODY3NTg4MzQzNTc1MTQyNTc4OS0wNjU2MWYwMGM5ZWZkYTQ2MTIwMzU1IiwicmQiOiJpb3Aub3JnIn0=
American Astronomical Society
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