[HCDX] Re: More Solar Shockwaves Expected

["Jan Alvestad" <jan@xxxxxxxxxx>]

No further shockwaves are currently expected. The extremely fast halo CME
observed after the X3.8 event on January 17 reached Earth near 0600 UT on
January 18, a transit time of approximately 21 hours. There was no shock
wave, or at least no observable shock as most of the normally available data
could not be used due to sensor contamination by the strong proton storm.
The arrival of the CME can be deduced from whatever SOHO, WIND and ACE data
that was still usable. Thermal velocity (SOHO MTOF) reached extreme levels
after the arrival of this CME. Solar wind velocity (SOHO and WIND)
measurements were unreliable but did indicate that something unusual was in
progress. ACE IMF total field measurements recorded a sudden increase at
05:33 UT and by 06:20 UT the IMF reached its strongest negative (southwards)
point.

With the proton storm gradually subsiding, "normality" was restored to solar
wind observations late on January 18. At this time both SOHO and ACE
recorded wind speed near 1000 km/sec, very impressive considering that the
CME had arrived many hours before.

Jan Alvestad (author Solar Terrestrial Activity Report -
http://www.dxlc.com/solar/ )
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