Overview of the AR NOAA 12569 observed on 2016 July 18. Panels (a) and (b), with the same FOV, display snapshots of high-resolution spectroheliograms in He I 10830 Å and Hα line center. Simultaneous observations, with the same FOV, by AIA on board SDO are given in panels (c)–(e), which in turn are maps of 171, 304, and 1600 Å. Panel (f) gives the map of the LOS magnetic field observed by HMI on board SDO with a larger FOV, in order to give an overall magnetic structure of the AR. Red/blue contours depict the magnetic field in the range of ±30 ∼ 300 Gauss. Note that the contours share a similar configuration with brightened network areas in 1600 Å in panel (e).