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Waves in the solar transition region Armagh Observatory, Armagh BT61 9DG, N. Ireland.
 

Summary: Waves in the solar transition region
J.G. Doyle
Armagh Observatory, Armagh BT61 9DG, N. Ireland.
jgd@star.arm.ac.uk
G.H.J. van den Oord
Sterrekundig Instituut, P.O. Box 80.000, 3508 TA Utrecht, The Netherlands.
G.H.J.vandenOord@fys.ruu.nl
E. O'Shea \Lambda and D. Banerjee
Armagh Observatory, Armagh BT61 9DG, N. Ireland.
dipu@star.arm.ac.uk
\Lambda now at Queens University Belfast, University Rd., Belfast BT7 1NN, N. Ireland.
E.OShea@qub.ac.uk
(Received ..... ; Accepted in final form .....)
Abstract.
The power spectra for line intensities of several lines formed in the upper transi­
tion region around 100,000 to 250,000K are presented. A period of ¸ 5min. is clearly
present in lines due to O III, O IV & O V. In one dataset a period approaching 10
min. is present for ¸40 min. The size of the emitting features is limited to ¸7 arcsec
squared. In all datasets examined, there is excess power below 4mHz everywhere
along the slit, although the observed periods do not always come from the most

  

Source: Armagh Observatory

 

Collections: Physics