SGP/MWR/C1 - Radio Frequency Interference during IOP

During the specified times a strong, continuous signal was 
measured by the 31.4 GHz of the MWR.  The signal was present
in all 31.4 GHz measurements including the sky measurement,
the internal reference target measurement, and the measurement
of the internal noise injection source from which the
instantaneous instrument gain is computed.

The source of the interference has not yet been identified.

Because the gain is computed using the difference of the
noise injection and target measurements, and because the
sky brightness temperature is computed relative to the
internal target temperature, the data appear anomalous
only for a period of an hour after the interference starts
and ends.  This is due to the low pass filter applied to
the instantaneous gain.  However the data should be
considered invalid or at least questionable during the
entire period for which the interference was present.

• Standard deviation about the mean for the IR brightness temperature(ir_temp_sdev)
• Averaged total liquid water along LOS path(liq)
• Time offset from base_time(time_offset)
• Flag indicating where the initial surface water measurements are from: 0-> SMOS,
  1-> AERI(water_flag)
• Number of data points averaged for 23tbsky, 31tbsky, vap & liq(num_obs)
• Number of points included in the ir_temp ensemble(num_obs_irt)
• North Latitude(lat)
• Mean 31.4 GHz sky brightness temperature(tbsky31)
• Total water vapor along LOS path(vap)
• -180.0 - +180.0(alt)
• Standard deviation about the mean for the 31.4 GHz sky brightness temperature(tbsky31_sdev)
• base time in epoch(base_time)
• Mean 23.8 GHz sky brightness temperature(tbsky23)
• Fraction of data in averaging interval with water on Teflon window(water_flag_fraction)
• IR Brightness Temperature(ir_temp)
• Probability of outlier in ratio of averaged brightness temps(prob_outlier)
• Probability of slope change in ratio of averaged brightness temps(prob_slope_change)
• 31.4 GHz sky brightness temperature(31tbsky)
• 23.8 GHz sky brightness temperature(23tbsky)
• Probability of level change in ratio of averaged brightness temps(prob_level_change)
• Standard deviation about the mean for the 23.8 GHz sky brightness temperature(tbsky23_sdev)
• Standard deviation about the mean for the total water vapor amount(vap_sdev)
• Number of data points averaged out of 15(number_obs_averaged)
• Standard deviation about the mean for the total liquid water amount(liq_sdev)
• lon(lon)

• 23.8 GHz sky signal(sky23)
• lon(lon)
• Mean 23.8 GHz sky brightness temperature(tbsky23)
• Water on Teflon window (1=WET, 0=DRY)(wet_window)
• (tknd)
• -180.0 - +180.0(alt)
• Total water vapor along LOS path(vap)
• Noise injection temp at nominal temperature at 23.8 GHz(tnd_nom23)
• North Latitude(lat)
• Sky Infra-Red Temperature(sky_ir_temp)
• Averaged total liquid water along LOS path(liq)
• 31.4 GHz sky signal(sky31)
• Temperature correction coefficient at 31.4 GHz(tc31)
• 23.8 GHz blackbody+noise injection signal(bbn23)
• Noise injection temp at nominal temperature at 31.4 GHz(tnd_nom31)
• base time in epoch(base_time)
• 23.8 GHz Blackbody signal(bb23)
• Blackbody kinetic temperature(tkbb)
• Noise injection temp at 31.4 GHz adjusted to tkbb(tnd31)
• Time offset from base_time(time_offset)
• Temperature correction coefficient at 23.8 GHz(tc23)
• 31.4 GHz blac2body+noise injection signal(bbn31)
• Mixer kinetic (physical) temperature(tkxc)
• Mean 31.4 GHz sky brightness temperature(tbsky31)
• 31.4 GHz blackbody(bb31)
• Noise injection temp at 23.8 GHz adjusted to tkbb(tnd23)
• Ambient temperature(tkair)

• 23.8 GHz sky signal(sky23)
• Temperature correction coefficient at 23.8 GHz(tc23)
• Water on Teflon window (1=WET, 0=DRY)(wet_window)
• Blackbody kinetic temperature(tkbb)
• Noise injection temp at nominal temperature at 31.4 GHz(tnd_nom31)
• base time in epoch(base_time)
• Temperature correction coefficient at 31.4 GHz(tc31)
• Mean 31.4 GHz sky brightness temperature(tbsky31)
• Time offset from base_time(time_offset)
• 31.4 GHz blac2body+noise injection signal(bbn31)
• lon(lon)
• Noise injection temp at nominal temperature at 23.8 GHz(tnd_nom23)
• Mixer kinetic (physical) temperature(tkxc)
• Mean 23.8 GHz sky brightness temperature(tbsky23)
• Noise injection temp at 23.8 GHz adjusted to tkbb(tnd23)
• Sky Infra-Red Temperature(sky_ir_temp)
• 23.8 GHz blackbody+noise injection signal(bbn23)
• Ambient temperature(tkair)
• Total water vapor along LOS path(vap)
• -180.0 - +180.0(alt)
• 31.4 GHz blackbody(bb31)
• Averaged total liquid water along LOS path(liq)
• Noise injection temp at 31.4 GHz adjusted to tkbb(tnd31)
• North Latitude(lat)
• 23.8 GHz Blackbody signal(bb23)
• (tknd)
• 31.4 GHz sky signal(sky31)