measurements in all wind categories at all stations were
140 V/m or less and the means were 210 V/m or less.
When all valid measurements (including winds in the ambiguous
category) at a station were combined the medians were
90 V/m or less and the means were 100 V/m or less.
Cumulative distributions of the electric-field measurements
by station and by wind condition are shown in Fig. 3.
Generally, the no-wind and upwind measurement distributions
were very similar over about 98 percent of their respective
sample populations (from the 1st to 99th percentile). The
distributions for downwind measurements deviated from those
for no-wind and upwind measurements over about 30 percent
of their respective populations (from the 70th to the 99th percentile).
This deviation in the distribution represented an increase
in positive fields. A comparable increase in downwind
negative fields was seen only at the SW station.
3) Versus Perpendicular Wind Speed: Plots of electric field
versus perpendicular wind speed by wind direction at each site
are shown in Fig. 4. Electric field measurements were aggregated
into several perpendicular intervals: less than 5 m/s, 5
to 3 m/s, 3 to 1 m/s, no-wind, 1 to 3 m/s, 3 to 5 m/s, and
greater than 5 m/s. The measured downwind field stayed relatively
constant as the wind speed increased above the no-wind
category. (Note: the increase in the downwind field at the NW