Counter-Streaming Mass Flow and Transient Brightening in Active Region Loops

摘要: An active region loop system was observed in a decaying for three hours by TRACE and BBSO joint campaign on September 27, 1998. Continuous mass motion seen Hα offhand filtergrams throughout the hours, some UV loops were exhibited transient brightenings. We find that: (1) cool material flowing along at speed of least 20 km s−1. Further, red blue wings, we see different opposite directions. This is first report counter-streaming pattern an system. (2) Transient brightenings times C iv 1550 A. These brightened located same altitudes as Ha loops. The observations show clear correlation between (3) Both footpoints regions mixed magnetic polarities. Frequent micro-flares one footpoint with small-scale spreading leg before brightening rising loop. Similar to case filament, continuous seems important maintaining coronal height. There may be indication that correlated due chromospheric reconnection