Frequency Scan Parameters

The &scan namelist group(s) defines frequency scan parameters; the input file can contain one or more, and points defined by each &scan namelist group are merged together. Allowable parameters are:

grid_type (default 'LINEAR')

Distribution of frequency points; one of:

  • 'LINEAR' : Uniform in frequency
  • 'INVERSE' : Uniform in inverse frequency
  • 'FILE' : Read from file
grid_frame (default 'INERTIAL')

Reference frame in which grid_type applies; one of:

  • 'INERTIAL' : Inertial frame
  • 'COROT_I' : Co-rotating frame at inner boundary
  • 'COROT_O' : Co-rotating frame at outer boundary
freq_min (default 1)
Minimum frequency, when grid_type is 'LINEAR' or 'INVERSE'
freq_max (default 10)
Maximum frequency, when grid_type is 'LINEAR' or 'INVERSE'
n_freq (default 10)
Number of frequency points, when grid_type is 'LINEAR' or 'INVERSE'
freq_units (default NONE)

Units of freq_min and freq_max, when grid_type is 'LINEAR' or 'INVERSE'; units of read frequencies when grid_type is 'FILE'

  • 'NONE' : Dimensionless angular frequency
  • 'HZ' : linear frequency in Hz[1]
  • 'UHZ' : linear frequency in μHz[1]
  • 'RAD_PER_SEC' : angular frequency in radians per second[1]
  • 'CYC_PER_DAY' : linear frequency in cycles per day[1]
  • 'ACOUSTIC_DELTA' : Fraction of the asymptotic acoustic large frequency separation \(\Delta \nu\)
  • 'GRAVITY_DELTA' : Fraction of the asymptotic inverse gravity period separation \((\Delta P)^{-1}\)
  • 'UPPER_DELTA' : Greater of \(\Delta \nu\) and \((\Delta P)^{-1}\)
  • 'LOWER_DELTA' : Lesser of \(\Delta \nu\) and \((\Delta P)^{-1}\)
  • 'ACOUSTIC_CUTOFF' : fraction of the acoustic cutoff frequency[1]
  • 'GRAVITY_CUTOFF' : fraction of the gravity cutoff frequency[1]
  • 'ROSSBY_I' : fraction of Rossby frequency (see equation (9)) at inner boundary
  • 'ROSSBY_O' : fraction of Rossby frequency (see equation (9)) at outer boundary
freq_min_units (default '')
Units of freq_min; same options as freq_units and overrides it if set
freq_max_units (default '')
Units of freq_max; same options as freq_units and overrides it if set
freq_min_frame (default 'INERTIAL')

Reference frame in which freq_min, when grid_type is 'LINEAR' or 'INVERSE'; one of:

  • 'INERTIAL' : Inertial frame
  • 'COROT_I' : Co-rotating frame at inner boundary
  • 'COROT_O' : Co-rotating frame at outer boundary
freq_max_frame (default 'INERTIAL')
Frame of freq_max; same options as freq_min_frame
file
File to read frequencies from, when grid_type is 'FILE'
axis (default 'REAL’)

Axis that scan applies to; one of

  • 'REAL' : Real axis
  • 'IMAG' : Imaginary axis
tag_list (default '', which matches all)
Comma-separated list of &mode tags to match

Footnotes

[1](1, 2, 3, 4, 5, 6) This option is only available when model_type is 'EVOL'
[2]This option is only used with gyre_contour