Active region EUV transient brightenings – First Results by EIT of SOHO JOP 80

摘要: On 13 May 1998, the Extreme-Ultraviolet Imaging Telescope (EIT, on board SOHO) has produced a unique image sequence operating in 'shutterless mode' (SOHO JOP 80). In JOP 80, EIT is lead instrument, followed by several space-born instruments (SXT, TRACE, MDI, CDS, SUMER), as well two observatories ground (in La Palma and Sac Peak). The target of campaign was relatively small but rapidly evolving active region (AR 8218). For contribution, 15 s cadence achieved Fe xii bandpass at 195 A leaving EIT's shutter open for 1 h CCD frame-transfer mode. this paper, we start analysis huge data set, making an inventory transients observed sequence. Besides scatter plots duration, size radiative output detected EUV brightenings, discuss full detail morphology evolution typical events. These range from B3.5 flare producing large plasma flow along pre-existing loops, to versions transient brightenings previously SXT Yohkoh. addition, new class weaker footpoint discussed that produce wave-like disturbances propagating quasi-open field lines. This extends wide variety phenomena discovered data, makes potential inter-instrumental studies JOP 80 all more exciting. We stress necessity such forthcoming reach instrument-independent classification small-scale solar transients.