SGP/SIROS/E13 - occasional spikes in readings

Since installation of this SIROS site to the dates specified, negative spikes
occurred in the data streams indicated, especially up_short_hemisp,
down_short_hemisp, down_long_diffuse_hemisp, and short_direct_normal.  These spikes were
induced by electrical interference from the fence that was used to keep out
cattle.  The spikes were eliminated by moving the fence further away from the
SIROS sensors in September 1994.  An assessment by Mike Split on the effects of
the spikes indicated that the spikes superimposed on the readings ranged from
-10 to -100 W m^-2.  As many as 40 per day could occur.  As a result of these
spikes, the daily average reading of irradiance could be reduced by as much as 
1 W m^-2, a half-hour average could be reduced by as much as 2 W m^-2, and a 5-min
average could be affected by as much as 5 W m^-2.

• (Development raw data stream - documentation not supported)

• Upwelling (10 meter) Shortwave Hemispheric Irradiance, Pyranometer(up_short_hemisp)
• Shortwave Direct Normal Irradiance, Pyrgeometer(short_direct_normal)
• Down-welling unshaded pyranometer voltage(down_short_hemisp)
• Downwelling Longwave Diffuse Hemispheric Irradiance, Ventilated Pyrgeometer(down_long_diffuse_hemisp)