Scan Namelist Group

The &scan namelist group governs the creation of frequency grids. The input file can contain one or more, and the points generated by all (tag-matching) groups are merged together to build a frequency grid (see the Frequency Grids section for further details). The following options are available:

grid_type (type: string, default: 'LINEAR')

Distribution of frequency points; one of

  • 'LINEAR' : Uniform in frequency

  • 'INVERSE' : Uniform in inverse frequency

  • 'FILE' : Read from file

grid_frame (type: string, 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 (type: real, default: 1)

Minimum frequency. Used only when grid_type = 'LINEAR' | 'INVERSE'

freq_max (type: real, default: 10)

Maximum frequency. Used only when grid_type = 'LINEAR' | 'INVERSE'

n_freq (type: integer, default: 10)

Number of frequency points. Used only when grid_type = 'LINEAR' | 'INVERSE'

freq_units (type: string, default: 'NONE')

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

  • 'NONE' : Dimensionless angular frequency

  • 'HZ' : Linear frequency in Hz[1]

  • 'UHZ' : Linear frequency in \(\mu\)Hz[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 eqn. 21) at inner boundary

  • 'ROSSBY_O' : fraction of Rossby frequency (see eqn. 21) at outer boundary

freq_min_units (type: string, default: '')

Units of freq_min; same choices as freq_units and overrides it if not blank

freq_max_units (type: string, default: '')

Units of freq_min; same choices as freq_units and overrides it if not blank

freq_frame (type: string, default: 'INERTIAL')

Reference frame in which freq_min and freq_max are defined; one of

  • 'INERTIAL' : Inertial frame

  • 'COROT_I' : Co-rotating frame at inner boundary

  • 'COROT_O' : Co-rotating frame at outer boundary

Used only when grid_type = 'LINEAR' | 'INVERSE'

file (type: string, default: '')

File to read frequencies from. Used only when grid_type = 'FILE'

axis (type: string, default: 'REAL')

Axis that &scan group applies to; one of

  • 'REAL' : Real axis

  • 'IMAG' : Imaginary axis

tag_list (type: string, default: '')

Comma-separated list of tag values to match; matches all if left blank

Footnotes