# OSIRIS_L2_O3_MART

## Variables

The table below lists the variables that are present in the HARP product that results from an ingestion of `OSIRIS_L2_O3_MART` data.

field name | type | dimensions | unit | description
--- | --- | --- | --- | ---
datetime | double | {time} | [seconds since 2000-01-01] | time of the measurement
latitude | double | {time} | [degree_north] | center latitude for a profile
longitude | double | {time} | [degree_east] | center longitude for a profile
altitude | double | {time, vertical} | [km] | altitude in km for each profile element
o3_volume_mixing_ratio | double | {time, vertical} | [ppmv] | volume mixing ratio of O3
o3_volume_mixing_ratio_uncertainty | double | {time, vertical} | [ppmv] | precision of the volume mixing ratio of O3
o3_number_density | double | {time, vertical} | [molec/cm3] | O3 number density
solar_zenith_angle | double | {time} | [degree] | solar zenith angle at the tangent point of the measurement; 0 is sun overhead, 90 is sun on the horizon
solar_azimuth_angle | double | {time} | [degree] | solar azimuth angle at the tangent point of the measurement; 0 is due North, 90 is due East, 180 is South and 270 is West
index | int32 | {time} |  | zero-based index of the sample within the source product

## Mapping description

OSIRIS Level 2 products only contain a single profile; all measured profile points will be provided in reverse order (from low altitude to high altitude) in the profile

The table below details where and how each variable was retrieved from the input product.

field name | mapping description
--- | ---
datetime | path | /HDFEOS/SWATHS/OSIRIS_Odin_O3MART/Geolocation_Fields/Time[]
description | time converted from TAI93 to seconds since 2000-01-01
latitude | path | /HDFEOS/SWATHS/OSIRIS_Odin_O3MART/Geolocation_Fields/Latitude[]
longitude | path | /HDFEOS/SWATHS/OSIRIS_Odin_O3MART/Geolocation_Fields/Longitude[]
altitude | path | /HDFEOS/SWATHS/OSIRIS_Odin_O3MART/Geolocation_Fields/Altitude[]
description | altitude information will be duplicated for each profile
o3_volume_mixing_ratio | path | /HDFEOS/SWATHS/OSIRIS_Odin_O3MART/Data_Fields/O3[]
description | ppmv
o3_volume_mixing_ratio_uncertainty | path | /HDFEOS/SWATHS/OSIRIS_Odin_O3MART/Data_Fields/O3Precision[]
description | ppmv
o3_number_density | path | /HDFEOS/SWATHS/OSIRIS_Odin_O3MART/Data_Fields/O3NumberDensity[]
solar_zenith_angle | path | /HDFEOS/SWATHS/OSIRIS_Odin_O3MART/Geolocation_Fields/SolarZenithAngle[]
solar_azimuth_angle | path | /HDFEOS/SWATHS/OSIRIS_Odin_O3MART/Geolocation_Fields/SolarAzimuthAngle[]