  We study the effect of sampling windows on derived shock and associated
energetic storm particle (ESP) properties in 296 fast-forward interplanetary
shocks using ACE measurements at 1 au between 02/1998 - 08/2013. We vary the
time windows from 2-mins to 20-mins for the shock properties and from 2-mins to
540-mins for ESP properties. Variability is quantified by the median absolute
deviation (MAD) statistic. We find that the magnetic, density, and temperature
compression ratios vary from their median values by 17.03%, 20.05%, 25.91%,
respectively; shock speed by 16.26%, speed jump by 45.46%, Alfvenic Mach number
by 31.53%, and shock obliquity by 24.25%. Spectral indices in the 2-min to
540-min windows downstream of the shock vary from the median value of 1.79 by
26.05%, and by 30.53% from the 1.70 median value upstream of the shock.
Similarity of ESP spectral indices upstream and downstream of the shock suggest
that these ESP populations are likely locally accelerated at the shock.
Furthermore, we find that for a moving sampling window around the shock, values
for the density ratio hold for ~10-mins; the magnetic ratio and shock speed
jump hold for ~30-mins, and ~60-mins, respectively. Fixing the upstream window
to 2-mins and moving only in the downstream direction, then the density ratio
holds for ~60-mins downstream, magnetic ratio for ~30-mins, and the shock speed
jump holds for ~110-mins. Beyond these time windows, derived shock properties
no longer representative of shock properties. These results provide constraints
for modeling and forecasting efforts of shock and ESP-associated properties.
