Type II shock and CME from the corona to 1 AU

Details Type II shock and CME from the corona to 1 AU Type II shock and CME from the corona to 1 AU

Aug 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999georl..26.2331d&link_type=abstract

Geophysical Research Letters, Volume 26, Issue 15, p. 2331-2334

Astronomy and Astrophysics

Astrophysics

20

Interplanetary Physics: Interplanetary Shocks, Solar Physics, Astrophysics, And Astronomy: Coronal Mass Ejections, And Astronomy: Radio Emissions, And Astronomy: Flares

Scientific paper

We explore the relationship among solar flares, type II-associated shock waves in the corona and solar wind, coronal mass ejections (CMEs), and shock waves observed at 1 AU. A clear example is that of 1997 Nov 4, where radio waves were observed continuously from 1800 MHz to 30 kHz. The CME was observed from 2.3 to 30R0. A shock was observed at 1 AU, followed by CME material. In addition a 2B, X2.1 flare initiated a wave in the low corona, and streams of fast electrons produced intense type III bursts along their path, and Langmuir waves at 1 AU. The liftoff time of the CME coincided to within a few minutes with the time of the impulsive flare and the initiation of the type II shock wave. The speed of the CME in the plane of the sky was similar to the derived speed of the type II shock from 1.26 to 78R0 and the average speed of the shock detected at 1 AU, 646 km/s. Therefore, the observations of this event demonstrate that type II shock waves, CMEs and flares can be closely interrelated, that coronal and interplanetary type II shock waves can be inseparable, and that the ensemble can commence at <~1.3R0 and continue outward to produce a shock and geophysically important effects at Earth.

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