Temporal variability in the Doppler-shift of solar transition region lines J. G. Doyle, M. S. Madjarska, I. Roussev, L. Teriaca and J. Giannikakis A&A, 396 1 (2002) 255-267 Published online: 22 November 2002 DOI: 10.1051/0004-6361:20021361