Extraction of Mauna Kea Mid-IR Transmission Spectrum

Extraction of Mauna Kea Mid-IR Transmission Spectrum

Start Wavelength (microns): End Wavelength (microns):

The wavelength range must be from 5 to 30 microns.


If the resolution is larger than 70 it is assumed to be the lambda/delta lambda value. If it is between 0 and 0.1 it is assumed to be delta lambda in microns. Values between 0.1 and 70 will cause the routines to return an error condition.


Airmass values from 1.0 to 2.0 are allowed.

PMM of water:

Water column values from 0.8 to 5.0 are allowed.

Y minimum value (default 0.0): Y maximum value (default 1.0):

The Y axis range values are ignored for raw text output.

Output format?

The files accessed by this page do not extend to wavelengths below 5 microns. See the near-infrared atmospheric transmission page for plots of the transmission at shorter wavelengths.

The number of values returned is independent of the resolution, and reflects the wavelength sampling of the originial ATRAN models. When lower resolutions are requested the values are convolved with a gaussian of the appropriate width. In fact the wavelength resolution requested in microns (or the value calculated from the resolution given as wavelength/sampling interval) is assumed to be the sigma value for the gaussian function used in the convolution. Thus the line FWHM from the convolution will be about 2.35 times the wavelength resolution specified.

This page was last modified June 12, 2005.

Kevin Volk (kvolk@gemini.edu)