Computer Science
Scientific paper
Jan 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004esasp.547..479i&link_type=abstract
Proceedings of 'SOHO 13 - Waves, Oscillations and Small-Scale Transient Events in the Solar Atmosphere: A Joint View from SOHO a
Computer Science
3
Sun, Flares, Oscillations
Scientific paper
Observations of the 21 April 2002 postflare emission are analysed to determine the properties of the dark structures falling sunward through the bright supra-arcade emission. TRACE 195 Å images show that the structures consist of a head followed by an undulating tail, falling with velocity km s. We examine two examples of relatively isolated inflows where the tail oscillations can be seen over about two and a half periods. The wavelength is , leading to a period min at any particular height. The head and tail structure do not appear to change as they fall through the outer 30-40 of the arcade, but as the head approaches the brighter arcade emission, it breaks and the tail undulations are rapidly damped. SUMER detected Fe XXI plasma emission with oscillating red and blue Doppler shifts of about 10 km s along the inflow edges. The wave amplitude of the tail oscillations both along and perpendicular to the line-of sight is about 2 .
Innes Davina E.
Wang Tower
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