AFS dynamics in a short-lived active region

摘要: In the framework of study on active region emergence, we report results obtained from analysis short-lived (7 days) NOAA 10407. The data used were acquired during an observational campaign carried out with THEMIS telescope in IPM mode July 2003, coordinated other ground- and space-based instruments (INAF-OACT, DOT, BBSO, MDI/SOHO, EIT/SOHO, TRACE). We determined morphological magnetic evolution 10407, as well velocity fields associated its structures. Within limits imposed by spatial temporal resolution images analyzed, first evidence formation is initially observed transition lower corona, later (i.e. after about 7 h) inner layers, found a previous concerning long-lived, recurrent region. also indicate that AFS formed shows typical upward motion at AFS’s tops downward footpoints. values relevant to motions decrease over region, similarly case while notice increasing trend downflow early phases time interval analyzed THEMIS. On hand, preceding legs show higher than following ones, result contrast long-lived chromospheric area overhanging sunspot umbra ∼ 2k m s −1 , above pores 4k .