Bulletin of Taras Shevchenko National University of Kyiv. Astronomy, no. 69, p. 11-21 (2024)
Irradiation of an entrance aperture of the polarimeter on a near-earth orbit at the electromagnetic wave length 1.378 mm
Vassyl DANYLEVSKY, Ph.D (Phys. & Math.), Senior Researcher
Taras Shevchenko National University of Kyiv, Kyiv, Ukraine
Abstract
Background. Stratospheric aerosol study is important to determine their role in the Earth climate system. Modern facilities for stratospheric aerosols study do not provide sufficient data and their satisfactory accuracy to solve the problem. Scientists propose some new techniques, such as imaging polarimeter on the near-earth orbit which can measure the intensity and polarization of the solar radiation scattered by the atmosphere in the water vapor spectral absorption band with the wavelength 1.378 mm.
Methods. Equations are described for calculation the polarimeter entrance aperture irradiation on the near-earth orbit by the solar radiation scattered by the atmosphere over the dark surface and over the diffuse lambert reflecting surface. Also, the equation and procedure are described for calculation of the atmosphere structure over the underlying surface patch observed by the polarimeter, optical depth of the molecular atmosphere, the phase function and degree of linear polarization of the solar radiation scattered by the molecular atmosphere. The procedure are described for calculation of the extinction coefficient, the phase function, degree of linear polarization of the solar radiation scattered by spherical particles in the stratosphere and aerosol optical depth of the stratosphere at the appropriate assumptions about the particle sizes, chemical composition and refractive index.
Results. The Instrument entrance aperture irradiation from single image element with angular size 0.5° х 0.5° estimated for the Sun-synchronous orbit with the altitude 700 km. Optical depth of the molecular atmosphere was calculated for altitude range from tropopause to » 85 km. Two models of the aerosol particle size distribution were used. The models were determined from the data obtained by different techniques on different altitudes. Model 1 of the wide size distribution has median radius rm » 0.046 mm and wide s » 1.85. Model 2 for narrow size distribution has rm » 0.13 mm and s » 1.26. It is supposed that the aerosol particle is 75% solution of H2SO4 in the water. The real part of the refractive index at the wavelength 1.378 mm is equal to 1.42, and the imagery part is equal to 5×10 – 5. These parameters of the particles are supposed to be the same in the altitude range from the tropopause to 35 km. The phase function, degree of polarization and irradiance estimated for the scattering angle range approximately of 68° to 162°.
Conclusions. The irradiance estimation can be used for determination of the polarimeter parameters, such as size of the entrance aperture, transmission, detector sensitivity, gain coefficient and for the estimation of the data number.
Key words
Aerosols, stratosphere, remote sensing, spectropolarimeter, near-earth orbit, solar radiance, irradiance.
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