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SUBROUTINE sla__ATMS (RT, TT, DNT, GAMAL, R, DN, RDNDR)
*+
* - - - - -
* A T M S
* - - - - -
*
* Internal routine used by REFRO
*
* Refractive index and derivative with respect to height for the
* stratosphere.
*
* Given:
* RT d height of tropopause from centre of the Earth (metre)
* TT d temperature at the tropopause (K)
* DNT d refractive index at the tropopause
* GAMAL d constant of the atmospheric model = G*MD/R
* R d current distance from the centre of the Earth (metre)
*
* Returned:
* DN d refractive index at R
* RDNDR d R * rate the refractive index is changing at R
*
* Last revision: 26 December 2004
*
* Copyright P.T.Wallace. All rights reserved.
*
* License:
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program (see SLA_CONDITIONS); if not, write to the
* Free Software Foundation, Inc., 59 Temple Place, Suite 330,
* Boston, MA 02111-1307 USA
*
*-
IMPLICIT NONE
DOUBLE PRECISION RT,TT,DNT,GAMAL,R,DN,RDNDR
DOUBLE PRECISION B,W
B = GAMAL/TT
W = (DNT-1D0)*EXP(-B*(R-RT))
DN = 1D0+W
RDNDR = -R*B*W
END
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