Summary: Astronomy & Astrophysics manuscript no. shuttrevg2 c ESO 2006
March 22, 2006
Macrospicules and blinkers as seen in Shutterless EIT 304 Å
M.S. Madjarska1, J.G. Doyle2, J.-F. Hochedez1, and A. Theissen1
Royal Observatory of Belgium, 3 Circular Avenue, B-1180 Brussels, Belgium
Armagh Observatory, College Hill, Armagh BT61 9DG, N. Ireland
now at: Max-Planck-Institut f¨ur Sonnensystemforschung, Max-Planck-Str. 2, 37191 Katlenburg-Lindau, Germany
Preprint online version: March 22, 2006
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 He II 304 Å line obtained in a shutterless mode of the Extreme-
ultraviolet 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 identified through an automatic brightenings identification 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.