Explosive events associated with a surge

The solar atmosphere contains a wide variety of small-scale transient fea-tures. Here, we explore the inter-relation between some of them such as surges, explosive events and blinkers via simultaneous spectral and imaging data taken with the TRACE imager, the SUMER, and CDS spectrometers on board SoHO, and SVST La Palma. The features were observed in spectral lines with forma-tion temperatures from 10,000 K to 1 MK and with the TRACE Fe ix/x 171 Å filter. The Hα filtergrams were taken in the wings of the Hα 6365 A ̊ line at ±700 mA ̊ and ±350 mÅ. The alignment of all data both in time and solar XY shows that SUMER line profiles, which are attributed to explosive events, are due to a surge phenomenon. The surge’s up- and down-flows which often appear simultaneously correspond to the blue- and red-shifted emission of the transition region N v 1238.82 A ̊ and O v 629.77 A ̊ lines as well as radiance increases of the C i, S i and S ii and Si ii chromospheric lines. Some parts of the surge are also visible in the TRACE 171 A ̊ images which could suggest heating to coronal temperatures. The surge is triggered, most probably, by one or more Elerman bombs which are best visible in Hα ±350 A ̊ but were also registered by TRACE Fe ix/x 171 A ̊ and correspond to a strong radiance increase in the CDS Mg ix 368.07 A ̊ line. With the present study we demonstrate that the division of small-scale transient events into a number of different subgroups, for instance explosive events, blinkers, spicules, surges or just brightenings, is ambiguous, implying that the definition of a feature based only on either spectroscopic or imaging characteristics as well as insufficient spectral and spatial resolution can be incomplete