Fig. 14.
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GOES proton observations (at >10 MeV, >30 MeV, and >100 MeV) for the SEP event on 19 October 1989, showing the softer spectrum of the delayed shock peak at ~16 UT on 20 October, in comparison with the earlier broad prompt peak at ~4 UT. The arrow indicates a possible shock at ~17 UT in the solar wind data (Cliver et al. 1990).
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