physics_funcs.h File Reference

#include "arts.h"
#include "complex.h"
#include "matpackI.h"

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Functions
void	fresnel (Complex &Rv, Complex &Rh, const Complex &n1, const Complex &n2, const Numeric &theta)
	fresnel
Numeric	invplanck (const Numeric &i, const Numeric &f)
	invplanck
Numeric	invrayjean (const Numeric &i, const Numeric &f)
	invrayjean
Numeric	number_density (const Numeric &p, const Numeric &t)
	number_density
Numeric	planck (const Numeric &f, const Numeric &t)
	planck

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Detailed Description

Author:

Patrick Eriksson <Patrick.Eriksson@rss.chalmers.se>

Date:

2002-05-08

This file contains declerations of functions of physical character.

Definition in file physics_funcs.h.

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Function Documentation

void fresnel	(	Complex &	Rv,
		Complex &	Rh,
		const Complex &	n1,
		const Complex &	n2,
		const Numeric &	theta
	)

fresnel

Calculates complex AMPLITUDE reflection coeffcients for a specular reflection

The properties of the two involved media are given as the complex refractive index, n. A dielectric constant, eps, is converted as n = sqrt( eps ). The power reflection coefficient, r, for one polarisation is r = abs(R)^2.

Parameters:

	Rv	Out: Reflection coefficient for vertical polarisation
	Rh	Out: Reflection coefficient for vertical polarisation
	n1	In: Refractive index of medium where radiation propagates
	n2	In: Refractive index of reflecting medium
	theta	In: Propagation angle from normal of radiation to be reflected

Author:

Patrick Eriksson

Date:

2004-09-21

Definition at line 80 of file physics_funcs.cc.

References DEG2RAD.

Referenced by surfaceFlatRefractiveIndex().

Numeric invplanck	(	const Numeric &	i,
		const Numeric &	f
	)

invplanck

Converts a radiance to Plack brightness temperature.

Returns:

Planck brightness temperature

Parameters:

	i	radiance
	f	frequency

Author:

Patrick Eriksson

Date:

2002-08-11

Definition at line 112 of file physics_funcs.cc.

References BOLTZMAN_CONST, PLANCK_CONST, and SPEED_OF_LIGHT.

Referenced by apply_y_unit(), Tensor6ToPlanckBT(), ybatchUnit(), and yUnit().

Numeric invrayjean	(	const Numeric &	i,
		const Numeric &	f
	)

invrayjean

Converts a radiance to Rayleigh-Jean brightness temperature.

Returns:

RJ brightness temperature

Parameters:

	i	radiance
	f	frequency

Author:

Patrick Eriksson

Date:

2000-09-28

Definition at line 139 of file physics_funcs.cc.

References BOLTZMAN_CONST, and SPEED_OF_LIGHT.

Referenced by apply_y_unit(), doit_conv_flagAbsBT(), doit_conv_flagLsq(), MCGeneral(), MCIPA(), ybatchUnit(), and yUnit().

Numeric number_density	(	const Numeric &	p,
		const Numeric &	t
	)

number_density

Calculates the atmospheric number density.

Returns:

number density

Parameters:

	p	pressure
	t	temperature

Author:

Patrick Eriksson

Date:

2000-04-08

Definition at line 167 of file physics_funcs.cc.

References BOLTZMAN_CONST.

Referenced by abs_coefCalcFromXsec(), calc_nd_field(), GasAbsLookup::Extract(), and RteCalc().

Numeric planck	(	const Numeric &	f,
		const Numeric &	t
	)

planck

Calculates the Planck function for a single temperature.

Note that this expression gives the intensity for both polarisations.

Returns:

blackbody radiation

Parameters:

	f	frequency
	t	temperature

Author:

Patrick Eriksson

Date:

2000-04-08

Definition at line 191 of file physics_funcs.cc.

References BOLTZMAN_CONST, PLANCK_CONST, and SPEED_OF_LIGHT.

Referenced by cloud_ppath_update1D_planeparallel(), cloud_RT_no_background(), emissionPlanck(), MatrixCBR(), MatrixPlanck(), MCGeneral(), MCIPA(), ScatteringMonteCarlo(), surface_specular_R_and_b(), surfaceBlackbody(), and surfaceFlatVaryingEmissivity().