<B>Solar particle energy spectra</B>
<PRE>

REVISED SEE mazur_ab80.html

J.E. Mazur
	The Aerospace Corporation, El Segundo, CA 90245-4691</PRE>
Solar particle energy spectra record the energetic particle production
at impulsive flare sites and within events associated with traveling
interplanetary shocks.  The spectra constrain models of the
acceleration process because they show the maximum energies that
particles attain as well as the overall distribution of their energy.
With the instrumentation on board ACE, we are able to measure the
energy spectra of a wide range of elements from supra-thermal (~ 10s of
keV/nucleon) to well above 10 MeV/nucleon with higher time resolution
than previously possible.  We will present examples of spectra measured
at 1 AU with ACE, focusing on ions accelerated in impulsive solar
flares.  These particle events have unique elemental and isotopic
enhancements, are solar in origin, and occasionally occur in isolation
from other sources of solar or interplanetary energetic particles.  We
will emphasize the ACE measurements that show that propagation through
the interplanetary medium has significant effects on the measured
spectra at 1 AU.