Ubiquitous rotating network magnetic fields and EUV cyclones in the quiet SunReport as inadecuate



 Ubiquitous rotating network magnetic fields and EUV cyclones in the quiet Sun


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We present the {\it 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 ten hours, 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 an ubiquitous presence of the RNFs. Using HMI line-of-sight magnetograms on 2010 July 8, we find 388 RNFs in an area of 800$\times$980 square arcseconds near the disk center where no active region is present. The sense of rotation shows a weak hemisphere preference. The unsigned magnetic flux of the RNFs is about 4.0$\times10^{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.



Author: Jun Zhang; Yang Liu

Source: https://archive.org/







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