SUMER spectral observations of post-flare supra-arcade inflows

Details SUMER spectral observations of post-flare supra-arcade inflows SUMER spectral observations of post-flare supra-arcade inflows

Nov 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003soph..217..247i&link_type=abstract

Solar Physics, v. 217, Issue 2, p. 247-265 (2003).

Physics

53

Scientific paper

On 21 April 2002 a large eruptive flare on the west limb of the Sun developed a bright, very dynamic, post-flare arcade. In TRACE 195 Å images, a series of dark, sunward moving flows were seen against the bright extreme ultraviolet (EUV) arcade. SUMER obtained a series of spectra of the dark EUV flows in the lines Cii, Fexii, and Fexxi at a fixed position above the limb. These spectra give spatially resolved line-of-sight velocities and emission measures for the arcade plasma over a temperature range 2×104 to 107 K. The flows are dark in all SUMER lines. The UV continuum longward (~1350 Å) and shortward (~675 Å) of the hydrogen Lyman limit is used to determine whether the dark 195 Å inflows are due to regions of low plasma density (plasma voids) or cold absorbing material. There is some evidence of absorption near the front of one of the inflows; however, along most of the dark channels there is no change in continuum ratio and we therefore conclude, as originally suggested by McKenzie and Hudson (1999), that they are plasma voids.

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