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We show signatures of spicules termed Rapid Blue-shifted Excursions (RBEs) inthe Si iv 1394 {\AA} emission line using a semi-automated detection approach.We use the H{\alpha} filtergrams obtained by the CRISP imagingspectropolarimeter on the Swedish 1-m Solar Telescope and co-aligned InterfaceRegion Imaging Spectrograph data using the SJI 1400 {\AA} channel to study theSpatio-temporal signature of the RBEs in the transition region. The detectionof RBEs is carried out using an oriented coronal loop tracing algorithm onH{\alpha} Dopplergrams at 35 km s^-1. We find that the number of detectedfeatures is significantly impacted by the time-varying contrast values of thedetection images, which are caused by the changes in the atmospheric seeingconditions. We detect 407 events with lifetime greater than 32 sec. This numberis further reduced to 168 RBEs based on the H{\alpha} profile and the proximityof RBEs to the large scale flow. Of these 168 RBEs, 89 of them display a clearSpatio-temporal signature in the SJI 1400 {\AA} channel, indicating that atotal of ~53% are observed to have co-spatial signatures between thechromosphere and the transition region.

monthly notices of the royal astronomical society

Detection of spicules termed Rapid Blue-shifted Excursions as seen in  the chromosphere via H{\alpha} and the transition region via Si iv 1394 {\AA}  line emission