SBART.utils.RV_utilities.AirtoVac#
Functions
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taken from idl astrolib ;+ ; NAME: ; AIRTOVAC ; PURPOSE: ; Convert air wavelengths to vacuum wavelengths ; EXPLANATION: ; Wavelengths are corrected for the index of refraction of air under ; standard conditions. |
- airtovac(wave_air)#
taken from idl astrolib ;+ ; NAME: ; AIRTOVAC ; PURPOSE: ; Convert air wavelengths to vacuum wavelengths ; EXPLANATION: ; Wavelengths are corrected for the index of refraction of air under ; standard conditions. Wavelength values below 2000 A will not be ; altered. Uses relation of Ciddor (1996). ; ; CALLING SEQUENCE: ; AIRTOVAC, WAVE_AIR, [ WAVE_VAC] ; ; INPUT/OUTPUT: ; WAVE_AIR - Wavelength in Angstroms, scalar or vector ; If this is the only parameter supplied, it will be updated on ; output to contain double precision vacuum wavelength(s). ; OPTIONAL OUTPUT: ; WAVE_VAC - Vacuum wavelength in Angstroms, same number of elements as ; WAVE_AIR, double precision ; ; EXAMPLE: ; If the air wavelength is W = 6056.125 (a Krypton line), then ; AIRTOVAC, W yields an vacuum wavelength of W = 6057.8019 ; ; METHOD: ; Formula from Ciddor 1996, Applied Optics 62, 958 ; ; NOTES: ; Take care within 1 A of 2000 A. Wavelengths below 2000 A in air are ; not altered. ; REVISION HISTORY ; Written W. Landsman November 1991 ; Use Ciddor (1996) formula for better accuracy in the infrared ; Added optional output vector, W Landsman Mar 2011 ; Iterate for better precision W.L./D. Schlegel Mar 2011 ;-