(meteorobs) Is there "the" ZHR profile of the Perseids?

[dfischer at astro.uni-bonn.de]

According to Central Bureau Electronic Telegram #2416 the rather
pronounced peak of the IMO autogenerated ZHR profile of this year's
Perseids - http://www.imo.net/live/perseids2010 - around 17:00 UTC on Aug.
12 may be due to a (predicted) dust trail produced in 1479: So 2010 would
then be another year in which the basic ZHR profile from the millennia old
dust is 'spoiled' by a young individual trail. Same happened last year, of
course - but how often is this the case? And are there well-observed
Perseid ZHR profiles in the literature for which we know for sure that
there were no trails messing around? The automatic 2008 and 2007 profiles
on the imo website both look 'complicated', too.

This not just an academic question (though an interesting one): It would
be nice to have a "standard" PER ZHR(t) diagram, if such a thing exists,
for more precise - if possible - predictions of what to expect in the
night(s) before and after the peak. There is a widespread belief, for
example, that the ZHR decays more rapidly after the peak - in the 2007,
2008 and 2010 data this is clearly(?) not the case. Another question would
be whether the fraction of bright PER is higher in the days before the
peak than on peak night itself (as some claimed this year); this should be
easy to answer from the data base.

Dan