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We investigate the propagation of the 2015 June 21 CME-driven shock asrevealed by the type II bursts at metric and longer wavelengths and coronagraphobservations. The CME was associated with the second largest geomagnetic stormof solar cycle 24 and a large solar energetic particle (SEP) event. Theeruption consisted of two M-class flares, with the first one being confined,with no metric or interplanetary radio bursts. However, there was intensemicrowave burst, indicating accelerated particles injected toward the Sun. Thesecond flare was eruptive that resulted in a halo CME. The CME was deflectedprimarily by an equatorial coronal hole that resulted in the modification ofthe intensity profile of the associated SEP event and the duration of the CMEat Earth. The interplanetary type II burst was particularly intense and wasvisible from the corona all the way to the vicinity of the Wind spacecraft withfundamental-harmonic structure. We computed the shock speed using the type IIdrift rates at various heliocentric distances and obtained information on theevolution of the shock that matched coronagraph observations near the Sun andin-situ observations near Earth. The depth of the geomagnetic storm isconsistent with the 1-AU speed of the CME and the magnitude of the southwardcomponent.

Sun-to-Earth Propagation of the 2015 June 21 Coronal Mass Ejection Revealed by Optical, EUV, and Radio Observations