GX_Simulator provides a built-in Potential Field Extrapolation (PFE) engine that is based on a pre-compiled external FORTRAN code developed by V. Abramenko and V. Yurchishin(BBSO) , wrapped into an IDL routine that follows a predefined template.

The  current version of GX_Simulator supports only a WIN32 platform implementation of the code in a form of a Dynamic Link Library (DLL), but an equivalent WIN64 DLL and an UNIX Shared Library may be provided by future updates.

pro gx_bz2pfe,Bz,nz,dr,Bcube
;bz must be a two dimensional array containing the base Bz data
sz=size(bz)
Nx=sz[1]
Ny=sz[2]
N=[Nx,Ny]
if sz[0] ge 4 then bz=reform(bz[*,*,*,2])
if sz[0] ge 3 then bz=reform(bz[*,*,sz[3]-1])
;Nz specifies the height of the extrapolation
if n_elements(Nz) eq 0 then Nz= min([Nx,Ny])
N=long([N,Nz])
;dr represents voxel size in each direction (arcsec)
if n_elements(dr) eq 0 then dr=[2.,2.,2.]
;Bcube is the four dimensinal datacube output
Bcube=fltarr(Nx,Ny,Nz,3)
;if not in the current directory, pathPFE must indicate the absolute location of the PFE_Dll2.dll file
pathPFE=gx_findfile('PFE_Dll2.dll',folder='userslib\Extrapolation\Windows\32bit')
RESULT=call_external(pathPFE,'GET_PFE_DATACUBE',N,dr,bz,Bcube,/F_VALUE,/unload )
end

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