4-5) Calculate the Pedersen and Hall conductance using Robinson's formulae
4)   Robinson et al, JGR, 2565-2569, 1987.
5)  See also Rich et al, Ann. Geophys., 527-534, 1987.  Please note that
C     there is an error in eq 14.  Do not divide by 2!  -- This reference
C     is how the DMSP people do it.  They only look at energies above 450 eV
C     usually.
4)    DO 1540 ITH=0,ITHMX
       DO 1540 LON=0,LONMX
	SIGPA(LON,ITH) = SQRT(EFLX2D(LON,ITH)) * 40. * EKEV2D(LON,ITH)
     |   / (16. + EKEV2D(LON,ITH)**2)
	SIGHA(LON,ITH) = 0.45 * (EKEV2D(LON,ITH)**0.85) * SIGPA(LON,ITH)
	SIGP(LON,ITH) = SQRT(SIGPA(LON,ITH)**2 + SIGPS(LON,ITH)**2)
	SIGH(LON,ITH) = SQRT(SIGHA(LON,ITH)**2 + SIGHS(LON,ITH)**2)
 1540 CONTINUE