IMA ion moments are calculated in IRAP using Andrei Fedorov procedure.
Density quality flag values:
VEX IMA protons and heavy ions number density could be considered reliable only in the case when corresponding quality flag (moments_quality_factor) is greater than 0.6 and density values themselves are greater than 0.01 cm-3
It is highly recommended to download quality flag along with IMA ion densities. scan_flag defines if there is scanning over elevation angles (scan_flag = 1) or not (scan_flag = 0).