NSA/AMC/C1 - Obstruction in instrument view

Physical obstruction in upward facing and downward facing PAR sensor measurements during 
hours of 21 and 22 GMT of each day. Obstruction is due to 40 meter tower between the sun 
and AMC rack where the PAR sensors are mounted.

Omit using all data between hours 21 and 22 GMT for each day.

• Standard Deviation on half hour averaged PAR, upward facing sensor(par_up_std)
• PAR mean, upward facing sensor(par_up)
• PAR mean, downward facing sensor, standard deviation(par_down_std)
• Half hour averaged PAR, downward facing sensor(par_down)
• PAR mean voltage, upward facing sensor(par_up_volt)
• PAR voltage, downward facing sensor, standard deviation(par_down_volt_std)
• PAR voltage, upward facing sensor, standard deviation(par_up_volt_std)
• PAR mean voltage, downward facing sensor(par_down_volt)