SGP/NFOV/C1 - Instrument down

Instrument was down, per Ron Severtsen.

• base time in epoch(base_time)
• -180.0 - +180.0(alt)
• Flag fields with *3 returned from callang(flag_zero_cosine1-24)
• NFOV Tube Temperature(nfov_tube_temp)
• lon(lon)
• Time offset from base_time(time_offset)
• Calibrated NFOV Zenith Radiance data(nfov_radiance)
• Calibrated NFOV zenith radiance data corrected for changes in head temperature.(nfov_radiance_temp_cor)
• Flag fields with *1 returned from callang(flag_zero_divisor1-24)
• Flag fields with *4 returned from callang(flag_nighttime1-24)
• NFOV Ambient Temperature(nfov_ambient_temp)
• Cosine of solar zenith angle(cosine_SZA)
• NFOV Head Temperature(nfov_head_temp)
• Raw counts from instrument before calibration, NFOV(nfov_counts)
• North Latitude(lat)
• Flag fields with *2 returned from callang(flag_ln_error1-24)