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Astronomy & Astrophysics manuscript no. blinkv2 April 28, 2005 (DOI: will be inserted by hand later)
 

Summary: Astronomy & Astrophysics manuscript no. blinkv2 April 28, 2005
(DOI: will be inserted by hand later)
Blinker/Macro-spicule activity in an off-limb polar region
E. O'Shea1, D. Banerjee2, and J.G.Doyle1
1
Armagh Observatory, College Hill, Armagh BT61 9DG, N.Ireland
e-mail: eos@arm.ac.uk, e-mail: jgd@arm.ac.uk
2
Indian Institute of Astrophysics, II Block, Koramangala, Bangalore 560 034, India
e-mail: dipu@iiap.res.in
Abstract. Using measurements of O V 629.73 from the Coronal Diagnostic Spectrometer (CDS) on board SOHO we report
on blinker activity in off-limb regions above the Northern pole of the Sun. The blinkers are found to be occurring above a region
showing strong dynamic activity, with evidence for evacuation of plasma. The presence of blinkers is discussed in terms of the
heating of spicular material.
Key words. Sun: UV radiation Sun: transition region Sun: atmosphere
1. Introduction
The term blinker was introduced by Harrison (1997) to describe
the sudden enhancement in flux observed in transition region
lines with CDS. These features are found to occur preferen-
tially on network boundaries (Harrison et al. 1999, Bewsher et

  

Source: Armagh Observatory

 

Collections: Physics