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Astronomy & Astrophysics manuscript no. smallEEsrev c ESO 2006 March 22, 2006

Summary: Astronomy & Astrophysics manuscript no. smallEEsrev c ESO 2006
March 22, 2006
Dynamic features in the solar atmosphere with unusual spectral
line enhancements and Doppler-shifts
J.G. Doyle1, B. Ishak1, M.S. Madjarska2, E. O'Shea1, and E. Dzif´c´akov´a3
Armagh Observatory, College Hill, Armagh BT61 9DG, N. Ireland
Royal Observatory of Belgium, 3 Circular Avenue, B-1180 Brussels, Belgium
Astronomical Institute, Faculty of Mathematics, Physics and Informatics, Comenius University, Mlynsk´a dolina, 842 48 Bratislava 4, Slovakia

now at: Max-Planck-Institut f¨ur Sonnensystemforschung, Max-Planck-Str. 2, 37191 Katlenburg-Lindau, Germany
Context. The solar atmosphere contains a wide variety of transient features, here, we discuss data relating to one such feature.
Aims. To explore via simultaneous spectral and imaging data the nature of high-velocity flow events in the solar transition region.
Methods. High spectral and temporal resolution data from SUMER/SoHO plus high resolution images from TRACE are used.
Results. In the transient feature discussed, we see a factor of two enhancement in N V 1238, coupled with a factor of two decrease in O V 629
visible over 3 ­4 along the slit. Furthermore, the O V line shows a secondary component with a down-flow of 75 km s-1
, while the N V line


Source: Armagh Observatory


Collections: Physics