ECHO ANALYSIS

AUTOMATED ANALYSIS

The Perl script, read_echo_tape, provides automated analysis of ECHO data tapes.

To analyze an ECHO tape using the current directory for data storage:
read_echo_tape --tape=tapename

To analyze data that has already been extracted to the current directory:
read_echo_tape --tape=tapename --no-mss --from-disk

MANUAL ANALYSIS

To manually analyze the data instead of using read_echo_tape follow these steps.
  1. Read the data off the tape.
    tar xvf tape device
  2. Concatenate the data.
    cat *.echo > ../filename.raw
    cat *.eng > ../filename.eng
    rm *.eng *.raw
  3. Extract engineering headers. (in IDL)
    IDL> extract_header,'filename.eng','Headers/filename.eng.header','eng'
    IDL> extract_header,'filename.raw','Headers/filename.header','raw','Bias/filename.bias'
  4. Find cloudy data.
    IDL> _home = 'parent directory of all data'
    IDL> find_clouds_echo,'filename',HOME=_home
  5. Find solar image positions.
    IDL> echo2,'filename',HOME=_home
  6. If desired, examine the engineering/solar position data.
    IDL> .r analyze_header
  7. Compute Doppler images.
    IDL> doppler2,'filename',HOME=_home
  8. If desired, look at the Doppler images.
    IDL> fits_movie,'path/filename.dop'
  9. Compute the calibration constant.
    IDL> cal_echo,'filename',HOME=_home
  10. Compute Difference images.
    IDL> make_vel_echo,'filename',HOME=_home
  11. If desired, look at the Difference images.
    IDL> fits_movie,'path/filename.vel'

LIST OF ROUTINES