Table 2.

Quality flags associated with each wind sample in Data Product 2.2

Quality Flag	Description
MIGHTI-A Flags
0	The signal-to-noise ratio is too low to reliably perform Level 1 processing.
1	ICON is near the South Atlantic Anomaly (SAA), and radiation effects on the detector could cause poor data quality. This flag is provided for reference and does not inform the overall Wind_Quality; instead, the low-quality data in the SAA are automatically flagged by other quality checks.
2	One of the calibrations has been deemed uncertain (e.g., the thermal drift calibration is too old).
3	Calibration lamps are on. This flag is raised during the once-daily calibration orbit (and any other times the calibration lamps are on). Although systematic errors associated with the calibration lamps have been strongly mitigated in v05, these exposures are still conservatively labeled with Wind_Quality = 0.5.
4	The sun or the moon is in or near the field of view.
5	There are not enough valid rows in the profile to perform the inversion. For v05, a threshold of 5 rows is used.
6	The signal-to-noise ratio is very low after the inversion, as determined by the root-mean-square phase variation across the row. These data are labeled with Wind_Quality=0.0 and masked out.
7	There is significant airglow above 300 km. This flag is raised if more than 40% of the total vertical column brightness is from altitudes above 300 km. In this case the handling of the top layer, and how it propagates through the inversion, is uncertain.
8	The tangent point is within 5 degrees of the terminator (defined as a solar zenith angle of 98 deg). Various errors can occur near the terminator, including those described by Harding et al. (2017a) and Wu et al. (2020).
9	This flag is raised for ∼30 minutes after each spacecraft maneuver, when the thermal environment on the spacecraft may not be well characterized. For lack of any evidence of wind artifacts associated with this potential issue, this flag does not inform the overall Wind_Quality, but is retained here for completeness.
10	The spacecraft pointing is not stable. This flag is raised if the standard deviation of the actual pointing about a linear trend, evaluated over the exposure time, is more than 0.01 deg.
11	The signal-to-noise level is somewhat low after the inversion, as determined by the root-mean-square phase variation across the row. These data may still be usable for certain analyses and are labeled with Wind_Quality=0.5.
MIGHTI-B Flags
12 - 23	Same as above
MIGHTI-A/B Combination Flags
24	No MIGHTI-A profile is found for MIGHTI A/B alignment. This may occur due to calibration operations, for example.
25	Same, for MIGHTI-B
26	A MIGHTI-A profile is available but does not sample the altitude grid under consideration. This only occurs at the bottom (∼90 km) and top (∼300 km) of the profile.
27	Same, for MIGHTI-B
28	Spherical asymmetry is detected: MIGHTI-A and -B emission rate estimates disagree by >40%.
29	This grid point mixes Normal and Reverse LVLH (Local Vertical Local Horizontal) from MIGHTI-A and -B, respectively (or vice versa). This is exceedingly rare.