Astronomy and Astrophysics – Astronomy
Scientific paper
Nov 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984a%26a...140..205c&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 140, no. 1, Nov. 1984, p. 205-209.
Astronomy and Astrophysics
Astronomy
23
Shock Waves, Solar Corona, Solar Flares, Type 2 Bursts, Interplanetary Space, Radio Astronomy, Radio Telescopes
Scientific paper
Recent observations have shown that the picture of coronal mass ejections (CME's) driving the shocks which produce coronal (C) Type II radio emission, faces severe difficulties. Meanwhile the correspondence between a large number of interplanetary (IP) shocks and CME's has been established. These results can be understood if there are two types of shocks i.e. that coronal shocks are not the progenitors of IP shocks. However, a relationship between C shocks and IP shocks has been established. This is that C Type II bursts associated with IP shocks which generate IP radio emission, commence at lower frequencies than other C Type II bursts. A possible scenario which can explain this result and yet be consistent with a two shock model, is one in which the C shock commences below the transient, which later drives an IP shock, and radio emission is generated when the C shock catches up to the mass ejection. Within the limitations of available data the model fits some events.
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