LF data format Ver. 1.0

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High time resolution time series

  • File name: rrrYYYYMMDDHH.dat.0.gz (rrr: station name)
  • Format gzipped-ascii file
  • Time resolution : 0.1sec
    column contents
    1st column amplitude of received signal at 40.0kHz
    2nd column phase of received signal at 40.0kHz
    3rd column amplitude of received signal at 60.0kHz
    4th column phase of received signal at 60.0kHz
    5th column amplitude of received signal at 19.8kHz
    6th column phase of received signal at 19.8kHz
    7th column amplitude of received signal at 21.4kHz
    8th column phase of received signal at 21.4kHz
    9th column amplitude of received signal at 22.2kHz
    10th column phase of received signal at 22.2kHz
    11th column amplitude of received signal at 24.8kHz
    12th column phase of received signal at 24.8kHz
    13th column amplitude of received signal at 25.0kHz
    14th column phase of received signal at 25.0kHz
    15th column amplitude of received signal at 50.0kHz
    16th column phase of received signal at 50.0kHz
    17th column amplitude of received signal at 54.0kHz
    18th column phase of received signal at 54.0kHz
    19th column amplitude of received signal at 68.5kHz
    20th column phase of received signal at 68.5kHz

Time averaged spectrum

  • File name: RRRYYYYMMDD.spc (RRR: station name)
  • Format ascii file
  • Time resolution : 1min
  • Structure of the data
    block contents
    1st block data block1 : averaged spectra at t=dt (dt=60min)
    2nd block data block2 : averaged spectra at t=dt*2
    …
    k-th block data block k : averaged spectra at t=dt*k
  • Block format
    Number contents
    1 Hour minute second
    2 Amplitude[dB] Phase[deg] at freq = 0Hz df=100k/2048
    3 Amplitude[dB] Phase[deg] at freq = df * 1 Hz
    4 Amplitude[dB] Phase[deg] at freq = df * 2 Hz
    …
    k+2 Amplitude[dB] Phase[deg] at freq = df * k Hz
    …
    2050 Amplitude[dB] Phase[deg] at freq = df * 2048 Hz