Astronomy and Astrophysics – Astronomy
Scientific paper
Jun 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997apj...482..535m&link_type=abstract
Astrophysical Journal v.482, p.535
Astronomy and Astrophysics
Astronomy
12
Sun: Activity, Sun: Chromosphere, Sun: Flares, Sun: Prominences, Sun: Radio Radiation
Scientific paper
The main objective of this paper is to present a quantitative study of the dynamics of the evolution of H alpha postflare loops developed after a large solar flare and the processed videos produced from the observations. The high spatial resolution of the Swedish Vacuum Solar Telescope (SVST) at La Palma has provided a unique set of data for such an event. A Gaussian fitting method is proposed to derive intensities and Doppler shifts from observations taken at three wavelengths (H alpha center and H alpha +/- 0.07 nm). Moving condensations or "blobs" of cold material provide transverse velocities, which, together with the radial component, enable us to derive their velocity vector magnitude. Plasma velocities are around free-fall velocities near the top of the loops but are significantly smaller close to their footpoints, suggesting a deceleration mechanism. The loops are anchored in the chromosphere, which shows tremendous activity in the active region and in the nearby "quiet Sun." Spicules and ejection of plasmoids are also observed at the limb.
Frank Zoe
Malherbe Jean-Marie
Schmieder Brigitte
Shine Richard A.
Tarbell Theodor
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