Solar Coronal Jets Extending to High Altitudes Observed during the 2017 August 21 Total Eclipse

• Published in: The Astrophysical journal 2018-06, Vol.860 (2), p.142
• Main Authors: Hanaoka, Yoichiro, Hasuo, Ryuichi, Hirose, Tsukasa, Ikeda, Akiko C., Ishibashi, Tsutomu, Manago, Norihiro, Masuda, Yukio, Morita, Sakuhiro, Nakazawa, Jun, Ohgoe, Osamu, Sakai, Yoshiaki, Sasaki, Kazuhiro, Takahashi, Koichi, Toi, Toshiyuki
• Format: Article
• Language: English
• Subjects: Astrophysics; Corona; Coronal holes; High altitude; Jets; Polar environments; Polar regions; Soft x rays; Solar activity; Solar corona; Solar eclipses; Solar observatories; Solar surface; Solar wind; Sun: activity; Sun: corona; White light
• ISSN: 0004-637X; 1538-4357
• DOI: 10.3847/1538-4357/aac49b

Coronal jets, which extend from the solar surface to beyond 2 R , were observed in the polar coronal hole regions during the total solar eclipse on 2017 August 21. In a time-series of white-light images of the corona spanning 70 minutes taken with our multi-site observations of this eclipse, six jets were found as narrow structures upwardly ejected with an apparent speed of about 450 km s−1 in polar plumes. On the other hand, extreme-ultraviolet (EUV) images taken with the Atmospheric Image Assembly of the Solar Dynamics Observatory show that all of the eclipse jets were preceded by EUV jets. Conversely, all the EUV jets whose brightnesses are comparable to ordinary soft X-ray jets and that occurred in the polar regions near the eclipse period, were observed as eclipse jets. These results suggest that ordinary polar jets generally reach high altitudes and escape from the Sun as part of the solar wind.