Statistical description of the radiation field in a homogeneous medium of finite optical thickness

We investigate the electromagnetic fields generated by a charged particle rotating inside a dielectric cylinder immersed into a homogeneous medium. The expressions for the bound modes of the radiation field are derived in both interior and exterior regions. The radiation intensity for the modes propagating inside the cylinder is evaluated by using two different ways: by evaluating the work done by the radiation field on the charge and by evaluating the energy flux through the cross-section of the cylinder. The relation between these two quantities is discussed. We investigate the relative contributions of the bound modes and the modes propagating at large distances from the cylinder to the total radiation intensity. Numerical examples are given for a dielectric cylinder in the vacuum. It is shown that the presence of the cylinder can lead to the considerable increase of the synchrotron radiation intensity.

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Multiple scattering in a dense aerosol atmosphere

Atmospheric Measurement Techniques Discussions ◽

10.5194/amtd-5-881-2012 ◽

2012 ◽

Vol 5 (1) ◽

pp. 881-907 ◽

Cited By ~ 11

Author(s):

S. Mukai ◽

T. Yokomae ◽

I. Sano ◽

M. Nakata ◽

A. Kokhanovsky

Keyword(s):

Radiative Transfer ◽

Multiple Scattering ◽

Radiation Field ◽

Biomass Burning ◽

Optical Thickness ◽

Dust Storm ◽

Efficient Algorithm ◽

Biomass Burning Aerosol ◽

Simulation Scheme ◽

Aerosol Properties

Abstract. This study was designed to develop an efficient algorithm to retrieve aerosol characteristics in aerosol events, which are associated with dense concentrations of aerosols in the atmosphere, such as a dust storm or a biomass burning plume. The idea of successive scattering of light is reviewed based on the theory of radiative transfer. Then derivation of the method of successive order of scattering (MSOS) is interpreted in detail, and it is shown that MSOS is available for a simulation scheme in the dense radiation field being used to retrieve aerosol properties in the event with the high optical thickness. Finally our algorithms are practically applied for the biomass burning aerosol event over the Amazon using Aqua/MODIS data.

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Radiative Transfer and Solar Oscillations

International Astronomical Union Colloquium ◽

10.1017/s025292110009552x ◽

1983 ◽

Vol 66 ◽

pp. 165-204

Author(s):

Jørgen Christensen-Dalsgaard ◽

Philip R. Goode

Keyword(s):

Radiative Transfer ◽

Radiation Field ◽

Optical Thickness ◽

Radial Oscillation ◽

Solar Oscillations ◽

Preliminary Results ◽

Radial Case ◽

Consistent Treatment ◽

Semi Empirical ◽

Horizontal Wavelength

AbstractWe consider the atmospheric behaviour of solar oscillations in a model including a detailed, semi-empirical atmosphere. Equations of radial and non-radial oscillation, with consistent treatment of the radiation field, are derived. These equations are solved in the radial, grey case; the results show that departure from the Eddington approximation has little effect on the properties of the oscillations. Preliminary results are presented for the non-radial case, indicating substantial deviations from the Eddington approximation when the optical thickness across a horizontal wavelength is of the order of or less than unity.

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