time stamp error

The internal code that runs the MFRSR data logger
had a bug that occasionally caused the time stamp associated with the data to
be slightly in error.  This error is thought to be very small (say less than
30 seconds) and very infrequent.  (Unfortunately, we cannot give firm
estimates of the magnitude and frequency of the error). 

After 96/07/09 the problem was corrected.  Those who use the data before this
time should realize that the time stamp for each record of data might be
slightly in error.

• Direct Normal Irradiance, NIMFR(direct_norm_narrowband)
• 25 meter Upwelling Shortwave Hemispheric Irradiance, Pyranometer(up_short_hemisp)
• Flag fields with *4 returned from callang(flag_nighttime1-24)
• Down-welling unshaded pyranometer voltage(down_short_hemisp)
• Flag fields with *1 returned from callang(flag_zero_divisor1-24)
• Flag fields with *2 returned from callang(flag_ln_error1-24)
• Thermistor Excitation Voltage, Data Logger(therm_volt)
• North Latitude(lat)
• Shortwave direct normal irradiance, pyrheliometer(short_direct_normal)
• Data logger supply voltage(logger_volt)
• base time in epoch(base_time)
• -180.0 - +180.0(alt)
• Ventilated Pyrgeometer Dome Temperature(down_long_dome_temp)
• MFRSR channels(channel)
• Data Logger Temperature(logger_temp)
• Time offset from base_time(time_offset)
• Diffuse Hemispheric Irradiance, MFRSR(diffuse_hemisp_narrowband)
• MFRSR Detector Temperature(mfrsr_temp)
• Flag fields with *3 returned from callang(flag_zero_cosine1-24)
• 25 meter Longwave Case Temperature, Pyrgeometer(up_long_case_temp)
• 10 meter Upwelling Longwave Hemispheric Irradiance, Pyrgeometer(up_long_hemisp)
• 10 meter Longwave Dome Temperature, Pyrgeometer(up_long_dome_temp)
• lon(lon)
• Ventilated Pyrgeometer Case Temperature(down_long_case_temp)
• Downwelling Longwave Diffuse Hemispheric Irradiance, Ventilated Pyrgeometer(down_long_diffuse_hemisp)
• Downwelling Shortwave Diffuse Hemispheric Irradiance, Ventilated Pyranometer(down_short_diffuse_hemisp)
• Direct Normal Irradiance, MFRSR(direct_norm_broadband)
• Hemispheric broadband irradiance(hemisp_broadband)
• Diffuse Hemispheric Broadband Irradiance, offset corrected(diffuse_hemisp_broadband)
• Hemispheric Irradiance, MFRSR(hemisp_narrowband)