Physics
Scientific paper
Apr 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983a%26a...120..136w&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 120, no. 1, April 1983, p. 136-138.
Physics
90
Shock Wave Propagation, Solar Corona, Solar Flares, Type 2 Bursts, Periodic Variations, Propagation Velocity, Solar Physics, Spectroheliographs, Stellar Mass Ejection
Scientific paper
Simultaneous radioheliograph and orbital coronagraph observations of coronal transient activity shows metric type II radio emission originating early in the event, well below the visible white light transient. The authors suggest that the shock which excites the type II emission is independent of the transient, in the sense that it is initiated in the low corona (probably in association with a flare) and travels through the already-existing transient disturbance with a propagation speed significantly greater than that of the front edge of the transient itself. Radio emission then results when the flare shock overtakes, first, the region of principal density pile-up along the sides of the expanding transient and only later the top of the transient.
MacQueen Robert M.
Wagner William J.
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