header:
  dimensions:
    num_records: 2
  global_attributes:
    acknowledgement: GRACE-FO is a joint mission of the US National Aeronautics and Space Administration and the German Research Center for Geosciences.  Use the digital object identifier provided in the id attribute when citing this data.  See https://podaac.jpl.nasa.gov/CitingPODAAC
    conventions: CF-1.6, ACDD-1.3, ISO 8601
    creator_email: gracefo@podaac.jpl.nasa.gov
    creator_institution: NASA/JPL
    creator_name: GRACE Follow-On Science Data System
    creator_type: group
    creator_url: http://gracefo.jpl.nasa.gov
    date_created: 2026-04-20T06:15:45Z
    date_issued: 2026-04-23T18:40:50Z
    history:
      - "INPUT FILE NAME               : CLK1B<-CLK1B_2026-04-05_C_04.dat"
      - "INPUT FILE CREATION TIME (UTC): CLK1B<-2026-04-20 06:15:31 by operator"
    id: 10.5067/GFJPL-L1B04
    institution: NASA/JPL
    instrument: USO
    instrument_vocabulary: NASA Global Change Master Directory instrument keywords
    keywords: GRACE-FO, USO
    keywords_vocabulary: NASA Global Change Master Directory (GCMD) Science Keywords
    license: https://science.nasa.gov/earth-science/earth-science-data/data-information-policy
    naming_authority: org.doi.dx
    platform: GRACE C
    platform_vocabulary: NASA Global Change Master Directory platform keywords
    processing_level: 1B
    product_version: 04
    program: NASA Earth Systematic Missions Program
    project: NASA Gravity Recovery And Climate Experiment Follow-On (GRACE-FO)
    publisher_email: podaac@jpl.nasa.gov
    publisher_institution: NASA/JPL
    publisher_name: Physical Oceanography Distributed Active Archive Center
    publisher_type: group
    publisher_url: http://podaac.jpl.nasa.gov
    references: https://podaac.jpl.nasa.gov/gravity/gracefo-documentation
    source: USO frequency data from GRACE C
    summary: USO frequency data derived from POD
    time_coverage_start: 2026-04-04T23:55:00.00
    time_coverage_stop: 2026-04-06T00:05:00.00
    title: GRACE-FO Level-1B USO Frequency Data
  non-standard_attributes:
    epoch_time: 2000-01-01T12:00:00.00
    software_build_time: 2023-06-21T17:10:46 UTC
    software_version: V04.10.2020-11-09-77-gc5e91-dirty
    start_time_epoch_secs: 828618900
    stop_time_epoch_secs: 828705900
  variables:
    - gps_time:
        comment: 1st column
        coverage_content_type: referenceInformation
        long_name: Continuous seconds past 01-Jan-2000 11:59:47 UTC
        units: second
    - GRACEFO_id:
        comment: 2nd column
        coverage_content_type: referenceInformation
        long_name: GRACE-FO satellite identifier
        units: char
        valid_range: C,D
        value_meanings:
          - C = GRACE-FO 1 (GRACE C)
          - D = GRACE-FO 2 (GRACE D)
    - uso_id:
        comment: 3rd column
        coverage_content_type: referenceInformation
        long_name: USO identifier
    - uso_freq:
        comment: 4th column
        coverage_content_type: modelResult
        long_name: USO frequency
        units: Hz
    - K_freq:
        comment: 5th column
        coverage_content_type: referenceInformation
        long_name: K band frequency
        units: Hz
    - Ka_freq:
        comment: 6th column
        coverage_content_type: referenceInformation
        long_name: Ka band frequency
        units: Hz
    - qualflg:
        comment: 7th column
        coverage_content_type: qualityInformation
        flag_masks: 1b, 2b
        flag_meanings:
          - bit 0 = Linear extrapolation of values not valid AFTER gps_time
          - bit 1 = Linear extrapolation of values not valid BEFORE gps_time
        long_name: Quality Flags, bit 0 is rightmost
# End of YAML header
828618900 C -1 4832000.071282889 24527232361.83194 32702976482.44259  00000010
828705900 C -1 4832000.071282889 24527232361.83194 32702976482.44259  00000001
