83 lines
2.4 KiB
Fortran
83 lines
2.4 KiB
Fortran
SUBROUTINE INTHE2(W0,X0,Z0,IWL,ILINE)
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C =====================================
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C
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C Interpolation in temperature and electron density from the
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C Schoening and Butler tables for He II lines to the actual
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C actual values of temperature and electron density
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C
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C This procedure is quite analogous to INTHYD for hydrogen lines
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C
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INCLUDE 'PARAMS.FOR'
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PARAMETER (UN=1.)
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COMMON/HE2DAT/WL2(36,19),XT2(6),XNE2(11,19),PRF2(36,6,11),
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* NWL2,NT2,NE2
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DIMENSION ZZ(3),XX(3),WX(3),WZ(3)
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C
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NX=3
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NZ=3
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C
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C for values lower than the lowest grid value of electron density
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C the profiles are determined by the approximate expression
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C (see STARKA); not by an extrapolation in the tables which may
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C be very inaccurate
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C
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IF(Z0.LT.XNE2(1,ILINE)*0.99.OR.Z0.GT.XNE2(NE2,ILINE)*1.01) THEN
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CALL DIVHE2(A,DIV)
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W0=STARKA(WL2(IWL,ILINE)/FXK,A,DIV,UN)*DBETA
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W0=LOG10(W0)
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GO TO 500
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END IF
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C
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C Otherwise, one interpolates (or extrapolates for higher than the
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C highes grid value of electron density) in the Schoening and
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C Butler tables
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C
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DO 10 IZZ=1,NE2-1
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IPZ=IZZ
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IF(Z0.LE.XNE2(IZZ+1,ILINE)) GO TO 20
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10 CONTINUE
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20 N0Z=IPZ-NZ/2+1
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IF(N0Z.LT.1) N0Z=1
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IF(N0Z.GT.NE2-NZ+1) N0Z=NE2-NZ+1
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N1Z=N0Z+NZ-1
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C
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DO 300 IZZ=N0Z,N1Z
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I0Z=IZZ-N0Z+1
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ZZ(I0Z)=XNE2(IZZ,iline)
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C
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C Likewise, the approximate expression instead of extrapolation
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C is used for higher that the highest grid value of temperature,
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C if the Doppler width expressed in beta units (BETAD) is
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C sufficiently large (> 10)
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C
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IF(X0.GT.1.01*XT2(NT2).AND.BETAD.GT.10.) THEN
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W0=STARKA(WL2(IWL,ILINE)/FXK,A,DIV,UN)*DBETA
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W0=LOG10(W0)
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GO TO 500
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END IF
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C
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C Otherwise, normal inter- or extrapolation
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C
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C Both interpolations (in T as well as in electron density) are
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C by default the quadratic interpolations in logarithms
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C
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DO 30 IX=1,NT2-1
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IPX=IX
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IF(X0.LE.XT2(IX+1)) GO TO 40
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30 CONTINUE
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40 N0X=IPX-NX/2+1
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IF(N0X.LT.1) N0X=1
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IF(N0X.GT.NT2-NX+1) N0X=NT2-NX+1
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N1X=N0X+NX-1
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DO 200 IX=N0X,N1X
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I0=IX-N0X+1
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XX(I0)=XT2(IX)
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WX(I0)=PRF2(IWL,IX,IZZ)
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200 CONTINUE
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WZ(I0Z)=YINT(XX,WX,X0)
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300 CONTINUE
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W0=YINT(ZZ,WZ,Z0)
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500 CONTINUE
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RETURN
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END
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