Macrospicules and blinkers as seen in Shutterless EIT 304 Å

Aims. Small-scale transient phenomena in the solar atmosphere are believed to play a crucial role in the coronal heating and solar wind generation. This study aims at providing new observational evidence on blinkers and macrospicules appearance in imager data and in doing so, establish the long disputed relationship between these phenomena. Methods. We analyse unique high-cadence images in the transition region Heii 304 ¯ line obtained in a shutterless mode of the Extremeultraviolet Imaging Telescope on board the Solar and Heliospheric Observatory. The data have a cadence of approximately 68 s and a pixel size of 2.62 arcsec. The events are identied through an automatic brightenings identication procedure. Features showing a jet-like structure seen in projection on the disk were selected and their light-curve further analysed. Results. The temporal evolution of the intensity in three events is shown, two of them seen on-disk as jet-like features and one above the limb. The ux increase, size and duration derived from the light-curve of the on-disk events show an identity with the blinker phenomenon. Conclusions. Our analysis of these events suggest that macrospicules where viewed on-disk are normally classied as blinkers, although since the blinker classication is rather broad this does not necessarily imply that all blinkers are macrospicules.