Astronomy and Astrophysics – Astronomy
Scientific paper
Jun 1976
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976soph...48..389g&link_type=abstract
Solar Physics, vol. 48, June 1976, p. 389-397.
Astronomy and Astrophysics
Astronomy
167
Coronagraphs, Solar Corona, Spaceborne Astronomy, Stellar Mass Ejection, Skylab Program, Solar Radio Bursts, Solar Wind Velocity
Scientific paper
Results are presented for a systematic study of ejection speeds for the mass-ejection events observed with the white-light coronagraph aboard Skylab. At least 66 such events (most of them not associated with flares) were observed during the Skylab mission. Direct measurements of the displacements of the leading edges of the observed disturbances yield ejection speeds ranging from less than 100 to greater than 1200 km/s, with the average being close to 470 (+ or - 50) km/s; seventy percent of the events are found to have speeds exceeding the escape velocity at 6 solar radii. It is shown that the speeds are loosely correlated with the type of H-alpha activity associated with the mass ejections and that events associated with flares usually have speeds greater than those of events associated with eruptive prominences. Despite their poor quality, statistics indicate that the fastest mass-ejection events tend to produce type II-IV burst pairs, while single type II or type IV bursts tend to be associated with events of intermediate speed.
Gosling Jack T.
Hildner Ernest
MacQueen Robert M.
Munro Richard Harding
Poland Arthur I.
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