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Propagation and Interaction Properties of Successive Coronal Mass Ejections in Relation to a Complex Type II Radio Burst by Y. D. Liu et al.*

19 Dec 2017, 10:04 UTC
Propagation and Interaction Properties of Successive Coronal Mass Ejections in Relation to a Complex Type II Radio Burst  by Y. D. Liu et al.*
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Quantifying how coronal mass ejections (CMEs), particularly fast ones, propagate from the Sun to the Earth is an overarching issue in CME research and space weather forecasting. A typical fast CME would finish its major deceleration well before reaching 1 AU (Liu et al. 2013). The actual situation of CME Sun-to-Earth propagation, however, may involve interactions with the highly structured solar wind including other CMEs. Interactions involving more than two CMEs can take place in the Sun-Earth space (e.g., Liu et al. 2012), because the typical transit time from the Sun to 1 AU is a few days, during which many eruptions could occur.
In the absence of wide-angle heliospheric imaging observations, a long-duration type II radio burst may provide a useful means to investigate the Sun-to-Earth dynamics of a CME/shock. The propagation distance of a CME/shock can be derived from the frequency drift of the associated type II burst. Type II emissions are also used to study CME-CME interactions, a typical signature of which is an increase in the bandwidth and intensity of the type II burst (Gopalswamy et al. 2001). It is still unclear how type II burst behaviors are connected with the characteristics of CME Sun-to-Earth propagation. ...

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