Name Template: PUB/MISSION/level1b/occTab/occTab_YYYY.DDD.LLL.NN_SSSS.VVVV_nc
| DDD | Day of year |
| IIII | Mission ID (CHAM, SACC, CO01-06, GPSM, etc) |
| LLL | LEO number (1-6 for COSMIC) |
| MISSION | Mission ID (eight characters or less--champ, champrt, sacc, sacctst, etc) |
| NN | Dump number since midnight |
| PUB | Base directory for the pub hierarchy |
| SSSS | Subtype (an ID which tells the command options used in generating this file) |
| VVVV | Version (an ID which tells the version of all codes using in generating thie file) |
| YYYY | Year |
Atmospheric and ionospheric occultation table. Contains information about which occultations
exist in a given download (one dump of data for one LEO) and where and when they
occured.
This table is in netCDF format
(see )
https://www.unidata.ucar.edu/software/netcdf/ for more details).
The data file contains global attributes which describe the entire dump, as
well as profile-based data which include one value per occultation which
occurred during the period covered by the data download.
Global Data
start_time
- Description:Starting time of the data download in GPS seconds
- Data Type: 64 bit double precision floating point
- Units: GPS seconds
end_time
- Description:Ending time of the data download in GPS seconds
- Data Type: 64 bit double precision floating point
- Units: GPS seconds
dump_id
- Description: The ID of this LEO download. YYYY.DDD.SSS.NN, where YYYY = year, DDD = Day of year, SSS = LEO ID and NN = Dump number that day The LEO ID is unique for a satellite (i.e. when a satellite re-enters the atmosphere, that number is never reused). Numbering starts with 1.
- Data Type: 15 byte character
Profile Data
azimuth
- Description:Occultation Azimuth: Angle between the LEO velocity vector and the projection of the LEO->GPS vector onto the LEO local plane. Measured from the LEO velocity vector clockwise looking down towards the Earth.
- Data Type: float
- Units: degrees , -180 to 180
- Missing Value: -999
early_occ
- Description:Flag: Occ starts before start of dump
- Data Type: byte
- Units: boolean: 0 or 1
- Missing Value: 255
ion_data_stop
- Description:Stop of MR data for ion occ
- Data Type: double
- Units: GPS seconds
- Missing Value: -999
ref_sat
- Description:Reference GPS satellite PRN
- Data Type: byte
- Units: Unitless
- Missing Value: 255
atm_perigee_lon
- Description:Longitude of perigee point at bottom of atm occ
- Data Type: float
- Units: degrees East, -180 to 180
- Missing Value: -999
atm_start_time
- Description:Start time of Atmospheric occ
- Data Type: double
- Units: GPS seconds
- Missing Value: -999
occ_id
- Description:Occultation ID per dump
- Data Type: long
- Units: Unitless
- Missing Value: -999
ion_perigee_lat
- Description:Latitude of perigee point at bottom of ion occ
- Data Type: float
- Units: degrees North, -90 to 90
- Missing Value: -999
atm_perigee_lat
- Description:Latitude of perigee point at bottom of atm occ
- Data Type: float
- Units: degrees North, -90 to 90
- Missing Value: -999
atm_data_stop
- Description:Stop of HR data for atm occ
- Data Type: double
- Units: GPS seconds
- Missing Value: -999
ion_perigee_lon
- Description:Longitude of perigee point at bottom of ion occ
- Data Type: float
- Units: degrees East, -180 to 180
- Missing Value: -999
ion_start_time
- Description:Start time of Ionospheric occ
- Data Type: double
- Units: GPS seconds
- Missing Value: -999
atm_data_start
- Description:Start of HR data for atm occ
- Data Type: double
- Units: GPS seconds
- Missing Value: -999
atm_stop_time
- Description:Stop time of Atmospheric occ
- Data Type: double
- Units: GPS seconds
- Missing Value: -999
setting
- Description:Flag: 0 if rising, 1 if setting
- Data Type: byte
- Units: Unitless
- Missing Value: 255
occ_type
- Description:Type = one byte: 00XXXXXX, where: 0x01 = atmospheric occ (has hr data, ref sat data and fid site data) 0x02 = has mr data (ionospheric occ) 0x04 = has hr data 0x08 = has ref sat data 0x10 = has fid data 0x20 = covers ionosphere (low rate ion occ)
- Data Type: byte
- Units: Unitless
- Missing Value: 255
ion_data_start
- Description:Start of MR data for ion occ
- Data Type: double
- Units: GPS seconds
- Missing Value: -999
fid_id
- Description:Fiducial (ground GPS) site 4 character ID
- Data Type: byte
- Units: Unitless
- Missing Value: XXXX
ion_stop_time
- Description:Stop time of Ionospheric occ
- Data Type: double
- Units: GPS seconds
- Missing Value: -999
occ_sat
- Description:Occulting GPS satellite PRN
- Data Type: byte
- Units: Unitless
- Missing Value: 255
late_occ
- Description:Flag: Occ ends after end of dump
- Data Type: byte
- Units: boolean: 0 or 1
- Missing Value: 255
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