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Name Template: PUB/MISSION/level1b/scn1c2/YYYY.DDD/scn1c2_IIII.YYYY.DDD.HH.MM.UUUU.GGG.TT_SSSS.VVVV_nc

DDDDay of year
GGGGNSS id (G28 = GPS satellite 28)
HHHour
IIIIMission ID (CHAM, SACC, C001-06, GPSM, etc)
LLLLEO number (1-6 for COSMIC)
MISSIONMission ID (eight characters or less--champ, champrt, sacc, sacctst, etc)
MMMinute
PUBBase directory for the pub hierarchy
SSSSSubtype (an ID which tells the command options used in generating this file)
TTAntenna ID
UUUUDuration of file in minutes
VVVVVersion (an ID which tells the version of all codes using in generating thie file)
YYYYYear

S4 amplitude scintillation index and auxiliary data computed in near real-time on-board the LEO satellite by the GNSS receiver. Each file contains S4 data from one GNSS satellite (small data gaps are allowed) from a single data dump. Data are based on 50 Hz observations and are provided every 10 seconds with a 10-second calculation time interval.

Global Data


processing_center

  • Description:Name of processing center
  • Data Type: char

timeOfProcessing

  • Description:Time of processing
  • Data Type: GPS time

mission

  • Description:Name of the mission
  • Data Type: char

subver

  • Description:Version of file
  • Data Type: char

convention

  • Description:File format convention
  • Data Type: char

dump_id

  • Description:Data dump ID
  • Data Type: char

leo_id

  • Description:ID of the LEO satellite
  • Data Type: int

antenna_id

  • Description:ID of the LEO antenna
  • Data Type: int

prn_id

  • Description:PRN ID of the GPS satellite
  • Data Type: int

start_time

  • Description:Starttime of data arc in GPS seconds
  • Data Type: double

stop_time

  • Description:Stoptime of data arc in GPS seconds
  • Data Type: double

year

  • Description:Year (four digit) of start_time
  • Data Type: int

month

  • Description:Month of the year of start_time
  • Data Type: int

day

  • Description:Day of the month of start_time
  • Data Type: int

hour

  • Description:Hour of day of start_time
  • Data Type: int

minute

  • Description:Minute of hour of start_time
  • Data Type: int

second

  • Description:Second of minute of start_time
  • Data Type: float

duration

  • Description:Duration of data arc in seconds
  • Data Type: float

s4min_L1

  • Description:Minimum (1-sec based) S4 index in arc on L1
  • Data Type: double

s4min_L2

  • Description:Minimum (1-sec based) S4 index in arc on L2
  • Data Type: double

s4max_L1

  • Description:Maximum (1-sec based) S4 index in arc on L1
  • Data Type: double

s4max_L2

  • Description:Maximum (1-sec based) S4 index in arc on L2
  • Data Type: double

elevmin

  • Description:Minimum elevation angle
  • Data Type: double
  • Units: deg

elevmax

  • Description:Maximum elevation angle
  • Data Type: double
  • Units: deg

elev_s4max_L1

  • Description:Elevation angle at maximum S4 index on L1
  • Data Type: double
  • Units: deg

alt_s4max_L1

  • Description:Altitude of LEO satellite position at maximum S4 index on L1
  • Data Type: double
  • Units: km

lat_s4max_L1

  • Description:Latitude of LEO satellite position at maximum S4 index on L1
  • Data Type: double
  • Units: deg

lon_s4max_L1

  • Description:Longitude of LEO satellite position at maximum S4 index on L1
  • Data Type: double
  • Units: deg

lct_s4max_L1

  • Description:Local time of LEO satellite position at maximum S4 index on L1
  • Data Type: double
  • Units: hrs

elev_s4max_L2

  • Description:Elevation angle at maximum S4 index on L2
  • Data Type: double
  • Units: deg

alt_s4max_L2

  • Description:Altitude of LEO satellite position at maximum S4 index on L2
  • Data Type: double
  • Units: km

lat_s4max_L2

  • Description:Latitude of LEO satellite position at maximum S4 index on L2
  • Data Type: double
  • Units: deg

lon_s4max_L2

  • Description:Longitude of LEO satellite position at maximum S4 index on L2
  • Data Type: double
  • Units: deg

lct_s4max_L2

  • Description:Local time of LEO satellite position at maximum S4 index on L2
  • Data Type: double
  • Units: hrs

alt_start

  • Description:Altitude of LEO satellite position at start_time
  • Data Type: double
  • Units: km

lat_start

  • Description:Latitude of LEO satellite position at start_time
  • Data Type: double
  • Units: deg

lon_start

  • Description:Longitude of LEO satellite position at start_time
  • Data Type: double
  • Units: deg

lct_start

  • Description:Local time of LEO satellite position at start_time
  • Data Type: double
  • Units: hrs

alt_stop

  • Description:Altitude of LEO satellite position at stop_time
  • Data Type: double
  • Units: km

lat_stop

  • Description:Latitude of LEO satellite position at stop_time
  • Data Type: double
  • Units: deg

lon_stop

  • Description:Longitude of LEO satellite position at stop_time
  • Data Type: double
  • Units: deg

lct_stop

  • Description:Local time of LEO satellite position at stop_time
  • Data Type: double
  • Units: hrs

conid

  • Description:GNSS Constellation ID - This attribute might not be present in the netcdf file that it is for GPS data. All newly processed data should have a conid parameter, but older files will not have this attribute
  • Data Type: char ('G' for GPS, 'R' for GLONASS)

L1_freq

  • Description:L1 frequency
  • Data Type: double

L2_freq

  • Description:L2 frequency
  • Data Type: double

Profile Data


time

  • Description:Time of GPS measurement (GPS seconds)
  • Data Type: double
  • Units: s
  • Valid Range: 0, 99999

S4_L1

  • Description:S4 scintillation index on L1
  • Data Type: float
  • Units: unit_less
  • Valid Range: 0, 5

S4_L2

  • Description:S4 scintillation index on L2
  • Data Type: float
  • Units: unit_less
  • Valid Range: 0, 5

elevation

  • Description:Elevation angle of LEO-GPS link
  • Data Type: double
  • Units: deg
  • Valid Range: -90, 90

x_LEO

  • Description:LEO x position (ECF) at time of signal reception
  • Data Type: double
  • Units: km
  • Valid Range: -9999, 9999

y_LEO

  • Description:LEO y position (ECF) at time of signal reception
  • Data Type: double
  • Units: km
  • Valid Range: -9999, 9999

z_LEO

  • Description:LEO z position (ECF) at time of signal reception
  • Data Type: double
  • Units: km
  • Valid Range: -9999, 9999

x_GPS

  • Description:GPS x position (ECF) at time of signal transmission
  • Data Type: double
  • Units: km
  • Valid Range: -29999, 29999

y_GPS

  • Description:GPS y position (ECF) at time of signal transmission
  • Data Type: double
  • Units: km
  • Valid Range: -29999, 29999

z_GPS

  • Description:GPS z position (ECF) at time of signal transmission
  • Data Type: double
  • Units: km
  • Valid Range: -29999, 29999