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UBIQUITOUS ROTATING NETWORK MAGNETIC FIELDS AND EXTREME-ULTRAVIOLET CYCLONES IN THE QUIET SUN
Zhang, Jun1; Liu, Yang2
2011-11-01
Source PublicationASTROPHYSICAL JOURNAL LETTERS
Volume741Issue:1
AbstractWe present Solar Dynamics Observatory (SDO) Atmospheric Imaging Assembly (AIA) observations of EUV cyclones in the quiet Sun. These cyclones are rooted in the rotating network magnetic fields (RNFs). Such cyclones can last several to more than 10 hr and, at the later phase, they are found to be associated with EUV brightenings (microflares) and even EUV waves. SDO Helioseismic and Magnetic Imager (HMI) observations show a ubiquitous presence of RNFs. Using HMI line-of-sight magnetograms on 2010 July 8, we find 388 RNFs in an area of 800 x 980 arcsec(2) near the disk center where no active region is present. The sense of rotation shows a weak hemisphere preference. The unsigned magnetic flux of the RNFs is about 4.0 x 10(21) Mx, or 78% of the total network flux. These observational phenomena at small scale reported in this Letter are consistent with those at large scale in active regions. The ubiquitous RNFs and EUV cyclones over the quiet Sun may suggest an effective way to heat the corona.
KeywordSun: Activity Sun: Corona Sun: Photosphere Sun: Uv Radiation
DOI10.1088/2041-8205/741/1/L7
Indexed BySCI
Language英语
WOS IDWOS:000296753000007
Citation statistics
Document Type期刊论文
Identifierhttp://ir.bao.ac.cn/handle/114a11/8002
Collection太阳物理研究部
Affiliation1.Chinese Acad Sci, Key Lab Solar Act, Natl Astron Observ, Beijing 100012, Peoples R China
2.Stanford Univ, WW Hansen Expt Phys Lab, Stanford, CA 94305 USA
Recommended Citation
GB/T 7714
Zhang, Jun,Liu, Yang. UBIQUITOUS ROTATING NETWORK MAGNETIC FIELDS AND EXTREME-ULTRAVIOLET CYCLONES IN THE QUIET SUN[J]. ASTROPHYSICAL JOURNAL LETTERS,2011,741(1).
APA Zhang, Jun,&Liu, Yang.(2011).UBIQUITOUS ROTATING NETWORK MAGNETIC FIELDS AND EXTREME-ULTRAVIOLET CYCLONES IN THE QUIET SUN.ASTROPHYSICAL JOURNAL LETTERS,741(1).
MLA Zhang, Jun,et al."UBIQUITOUS ROTATING NETWORK MAGNETIC FIELDS AND EXTREME-ULTRAVIOLET CYCLONES IN THE QUIET SUN".ASTROPHYSICAL JOURNAL LETTERS 741.1(2011).
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