Astronomy and Astrophysics – Astrophysics
Scientific paper
Nov 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983a%26a...127..337s&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 127, no. 2, Nov. 1983, p. 337-344. Research supported by the Institut National
Astronomy and Astrophysics
Astrophysics
23
Carbon, Chromosphere, H Alpha Line, Solar Spectra, Stellar Mass Ejection, Radial Velocity, Solar Maximum Mission
Scientific paper
Time sequences of a surge have been obtained in Active Region 2701 during a coordinated SMY program, on October 2nd, 1980, while the MSDP spectrograph operated in H-alpha at the Meudon Solar Tower and the UVSP spectrometer on SMM observed in the 1548 A C IV resonance line. The cold (H-alpha) and hot (C IV) material follow the same channel, and the event lasts about 10 min in both lines. A good correlation is found between H-alpha and C IV velocities; radial velocities along the surge are in the range 40-60 km/s in both cases. The observations are consistent with the hypothesis that a pressure gradient drives the surge. The H-alpha data seem to indicate the presence of a shock wave in the chromosphere, while the C IV quantities (velocities, accelerations) vary on a very short time scale. Their maxima occur at some locations which could be interpreted as 'pinched' zones.
Mein Pierre
Schmieder Brigitte
Tandberg-Hanssen Einar
Vial Jean-Claude
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