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Astronomy & Astrophysics manuscript no. blinkermodelcolor March 3, 2004 (DOI: will be inserted by hand later)

Summary: Astronomy & Astrophysics manuscript no. blinkerómodelócolor March 3, 2004
(DOI: will be inserted by hand later)
New insight into the blinker phenomenon and the dynamics of the
solar transition region
J. G. Doyle 1 , I. I. Roussev 2 and M. S. Madjarska 3
1 Armagh Observatory, College Hill, Armagh, BT61 9DG, N. Ireland
2 Center for Space Environment Modeling, University of Michigan, 2455 Hayward St, Ann Arbor, MI 48109, USA
3 Mullard Space Science Laboratory, UCL, Holmbury St. Mary, Dorking, Surrey, RH5 6NT, UK
Received date, accepted date
Abstract. We present, for the first time, blinker phenomena being associated with brightenings in pre≠existing coronal loops
registered by the Extreme≠ultraviolet Imaging Telescope (EIT) in Fe ### 195 Ň. The brightenings occur during the emergence of
new magnetic flux as registered by the Big Bear Solar Observatory (BBSO) magnetograph. The blinkers were identified using
simultaneous observations obtained with the Coronal Diagnostic Spectrometer (CDS) and Solar Ultraviolet Measurements of
Emitted Radiation (SUMER) spectrograph. In light of the new observational results, we present one possible theoretical inter≠
pretation of the blinker phenomenon. We suggest that the blinker activity we observe is triggered by interchange reconnection,
serving to provide topological connectivity between newly emerging flux and pre≠existing flux. The EIT images show the ex≠
istence of loop structures prior to the onset of the blinker activity. Based on the available spatial resolution the blinker occurs
within, or nearby, an existing coronal loop. The temperature interfaces created in the reconnection process between the cool
plasma of the newly emerging loop and the hot plasma of the existing loop are what we suggest to causes the observed activity
seen in both the SUMER and CDS data. As the temperature interfaces propagate with the characteristic speed of a conduc≠


Source: Armagh Observatory


Collections: Physics