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