ATMOSPHERE FORMAT
Keywords: astro

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ATMOSPHERE FORMAT

        The ATM values are saved in binary files which use an ad-hoc format  (in
        particular, this is not the Gildas Data Format). They are Fortran unfor-
        matted (binary) files, usually read in direct access mode with 128 words
        (512  bytes) records. The values are written in the current machine sys-
        tem (IEEE, EEEI, ...); this system is saved as the very  first  word  in
        the file.

        The  file  consists  in a succession of tables describing the opacities,
        atmospheric emission, and optical length in the space of pressure,  tem-
        perature, frequency, water vapor, and airmass. The values in the tables,
        and the tables themselves, are written contiguously (no blanks  inserted
        e.g. no alignment on the records). Here is the exact sequence:

        Code    C*4  [     ]  System code

        Np      I*4  [     ]  Number of pressure values
        Nt      I*4  [     ]  Number of temperatures
        Nf      I*4  [     ]  Number of frequencies
        Nw      I*4  [     ]  Number of precipitable water vapor amounts
        Na      I*4  [     ]  Number of airmass values

        P[Np]   R*4  [HPa  ]  Pressure values
        T[Nt]   R*4  [K    ]  Temperaure values
        F[Nf]   R*4  [GHz  ]  Frequencies
        W[Nw]   R*4  [mm   ]  Precipitable water vapor amounts
        A[Na]   R*4  [     ]  Airmass values

        tauox[Nf,Nt,Np]        R*4  [neper] Opacity (dry component)
        tauw[Nf,Nt,Np]         R*4  [neper] Opacity (wet component)

        Temis[Na,Nw,Nf,Nt,Np]  R*4  [K    ] Atmospheric emission
        Path[Na,Nw,Nf,Nt,Np]   R*4  [cm   ] Optical length