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Astronomy & Astrophysics manuscript no. (will be inserted by hand later)

Summary: Astronomy & Astrophysics manuscript no.
(will be inserted by hand later)
Temporal Variability in the Doppler-shift of Solar Transition
Region Lines
J. G. Doyle 1 , M. S. Madjarska 1 , I. Roussev 1;2 , L. Teriaca 3 , and J. Giamikakis 4
1 Armagh Observatory, College Hill, Armagh, BT61 9DG, N. Ireland;
2 Center for Space Environment Modeling, 1414 Space Research Building, The University of Michigan, Ann
Arbor, MI 48109-2143, USA
3 Osservatorio Astro sico di Arcetri, Largo Enrico Fermi 5, 50125 Firenze, Italy
4 Sect. of Astrophysics, Astronomy and Mechanics, Dept. of Physics, Univ. of Athens, Athens 15783, Greece;
e-mail: jgd@star.arm.ac.uk, madj@star.arm.ac.uk, iroussev@umich.edu, lte@arcetri.astro.it
Received date, accepted date
Abstract. High cadence datasets taken in C iii 977  A, O vi 1032  A and Ne viii 720  A were analysed in an e ort
to establish the extent of the variability in the Doppler-shift of typical mid-transition region lines. The shortest
time-scale variability seems to occur in the network boundary regions where the line-shift can vary by 7 8 km s 1
in less than 1 min. The internetwork region also shows variability although this tends to be longer lived,  2 3
mins. The average line-shift in C iii is a red-shift which ranges from  2 km s 1 to  20 km s 1 with an average
value for all regions selected being around 10 km s 1 in very good agreement with that derived by others. The
red-shift values indicate a clear di erence between network and internetwork regions, with the largest red-shift
being present at the network boundary. For O vi, this gives an average red-shift ranging from 5 to 10 km s 1 . For


Source: Armagh Observatory


Collections: Physics