Author(s): , , , , , ,
Institution(s): 1. Korea Astronomy and Space Science Institute (KASI), 2. New jersey Institute of Technology
Recent observations by Interface Region Imaging Spectrograph (IRIS) instrument have shown a variety of brightenings around the large-scale active region in the solar atmosphere from the photosphere to the corona. Interestingly while some brightenings are clearly related to Ellerman bombs, some seem to have nothing to do with them. On 2014 July 31, New Solar Telescope (NST) in Big Bear Solar Observatory (BBSO) performed a joint observation with IRIS instrument for the NOAA AR 12127 from 20:00 UT to 22:00 UT. Around the sunspot several IRIS brightenings were observed in 3-channels of slit-jaw images (SJI_2796, SJI_1400, and SJI_1330), which can monitor the upper chromosphere and transition region. The NST’s Fast Imaging Solar Spectrograph (FISS) observed a well-developed Ellerman bomb in the upper right side of the sunspot. The Ellerman bomb is clearly coincident with the IRIS brightening at the same location. Since the Ellerman bombs are usually believed to occur in the photosphere with no coronal emission, it should be explained its higher atmospheric emission in IRIS data. We will present the result of simultaneous observations by IRIS and NST instruments.