Abstract
To determine the aerosol absorption component of the effective optical depth τ κeff , a special method has been developed. It is based on the implausible effect of the decrease of the aerosol scattering component τ aeff in dependence on the atmospheric pressure P, if τ κeff = 0. It is the elimination of this effect by selecting the values of τ κeff that allows the latter to be determined. This method was tested with the data of observations of the North Equatorial Belt (NEB) of Jupiter’s disk in the methane absorption bands at λ = 619 and 727 nm. This allowed us to determine the values of τ κeff and the imaginary part of the refractive index of aerosol particles (n i = 0.00063, 0.00065, 0.0007, and 0.00069 at λ = 605.5, 631.3, 714.7, and 741.4 nm, respectively) and to correctly specify the characteristic of the vertical structure of clouds of the planet.
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References
V. V. Avramchuk, L. A. Bugaenko, A. V. Morozhenko, and E. G. Yanovitskii, “The results of research of Jupiter, performed at the Main astrophysical observatory of the Ukrainian SSR Academy of Sciences,” Astrom. Astrofiz., No. 31, 54–68 (1977).
M. S. Dementiev and A. V. Morozhenko, “On the vertical inhomogenity of Uranus and Neptune,” Astron. Vestn. 24, 127–134 (1990).
A. V. Morozhenko, “The results of the polarization studies of Jupiter,” Astrom. Astrofiz., No. 30, 47–54 (1976).
A. V. Morozhenko, “On the structure of the Jupiter’s cloud layer,” Pis’ma Astron. Zh. 10, 775–779 (1984).
A. V. Morozhenko, “The vertical structure of the Jupiter’s latitudinal cloud belts,” Astron. Vestn. 19, 64–76 (1985).
A. V. Morozhenko, “Problems in research of the vertical structures of cloud layers in atmospheres of giant planets,” Kinematika Fiz. Nebesnykh Tel 9, 3–26 (1993).
A. V. Morozhenko, “Probable limits for particle size and relative concentrations of aerozol and methane on formation levels of methane absorption belt centers at λλ 727, 619, 543 and 441 nm in the Neptune’s atmosphere,” Kinematika Fiz. Nebesnykh Tel 15, 110–122 (1999).
A. V. Morozhenko, “The difference between vertical structures of cloud layers of giant planets,” Kinematika Fiz. Nebesnykh Tel 17, 261–278 (2001).
A. V. Morozhenko, “Redefining the values of monochromatic absorption coefficients of methane, considering thermal conditions of the giant planets. II. Jupiter,” Kinematika Fiz. Nebesnykh Tel 19, 483–500 (2003).
A. V. Morozhenko and E. G. Yanovitskii, “Parameters of the optical model of the Jovian atmosphere for the continuous spectrum in 0.35–0.92 µm range,” Pis’ma Astron. Zh. 2, 50–54 (1976).
O. V. Morozhenko, Methods and Results of the Remote Probing of Planetary Atmospheres (Naukova Dumka, Kiev, 2004) [in Ukrainian].
A. S. Ovsak, “Changes in the volume scattering coefficient of aerosol in the Jovian atmosphere derived from whole-disk observations,” Kinematics Phys. Celestial Bodies 31, 197–204 (2015).
A. S. Ovsak, V. G. Teifel’, A. P. Vid’machenko, and P. G. Lysenko, “Zonal differences in the vertical structure of the cloud cover of Jupiter from the measurements of the methane absorption bands at 727 and 619 nm,” Kinematics Phys. Celestial Bodies 31, 23–39 (2015).
E. G. Yanovitskii, “The effective optical width of a cloud layer of the atmosphere, in which a visible spectrum of the planet forms. The concept and basic evaluation,” Kinematika Fiz. Nebesnykh Tel 13 (6), 18–25 (1997).
J. W. Chamberlain, “The atmosphere of Venus near cloud top,” Astrophys. J. 141, 1184–1205 (1965).
M. S. Dementiev and A. V. Morozhenko, “Zones and belts of Jupiter’s disk. The difference in the vertical structure of cloud layers,” Astron. Vestn. 24, 275–287 (1990).
Zh. M. Dlugach and M. I. Mishchenko, “The effect of aerosol shape in retrieving optical properties of cloud particles in the planetary atmospheres from the photopolarimetric data. Jupiter,” Sol. Syst. Res. 32, 102–111 (2005).
Zh. M. Dlugach and M. I. Mishchenko, “Photopolarimetry of planetary atmospheres: what observational data are essential for a unique retrieval of aerosol microphysics?,” Mon. Not. R. Astron. Soc. 384, 64–70 (2008).
L. P. Giver, “Intensity measurements of the CH4 bands in the region of 4350 to 10600 Å,” J. Quant. Spectrosc. Radiat. Transfer 19, 311–322 (1978).
E. Karkoschka, “Spectrophotometry of the Jovian planets and Titan at 300 to 1000 nm wavelength: The methane spectrum,” Icarus 111, 967–982 (1994).
E. Karkoschka, “Methane, ammonia, and temperature measurements of the Jovian planets and Titan from CCD-spectrophotometry,” Icarus 133, 134–146 (1998).
G. F. Lindal, “The atmosphere of Neptune: An analysis of radio occultation data with Voyager 2,” Astron. J. 103, 967–982 (1992).
M. I. Mishchenko, “Physical properties of the upper troposphere aerosols in the equatorial region of Jupiter,” Icarus 84, 296–304 (1990).
M. I. Mishchenko, “The FORTRAN code for computing the scattering of an ensemble of polydisperse, homogeneous spherical particles in based on the Lorenz-Mie theory,” http://www.giss.nasa.gov/staff/mmishchenko/ ftpcode/spher.f.
M. I. Mishchenko, L. D. Travis, R. A. Kahn, and R. A. West, “Modeling phase functions for dustlike tropospheric aerosols using a shape mixture of randomly oriented polydisperse spheroids,” J. Geophys. Res. 102, 16831–16847 (1997).
A. V. Morozhenko, “New determination of monochromatic methane absorption coefficients with regard to the thermal conditions in the atmospheres of giant planets. IV. Jupiter and Saturn,” Kinematics Phys. Celestial Bodies 23, 245–257 (2007).
A. V. Morozhenko, A. S. Ovsak, and P. P. Korsun, “The vertical structure of Jupiter’s cloud layer before and after the impact of comet Shoemaker–Levy 9,” in Proc. Eur. SL-9/Jupiter Workshop, München, Feb. 13–15, 1995 (European Southern Observatory, Garching, 1995), p. 267.
A. V. Morozhenko and E. G. Yanovitskij, “The optical properties of Venus and Jovian planets. I. The atmosphere of Jupiter according to polarimetric observations,” Icarus 18, 583–592 (1973).
H. B. Niemann, S. K. Altreya, G. R. Carignan, et al., “The composition of the Jovian atmosphere as determined by the Galileo probe mass spectrometer,” J. Geophys. Res. 103, 22831–22845 (1998).
A. S. Ovsak, “Calculation of effective optical depth of absorption line formation in homogeneous semi-infinite planetary atmosphere during anisotropic scattering,” Kinematics Phys. Celestial Bodies 26, 86–88 (2010).
A. S. Ovsak, “Upgraded technique to analyze the vertical structure of the aerosol component of the atmospheres of giant planets,” Kinematics Phys. Celestial Bodies 29, 291–300 (2013).
A. S. Ovsak, “Vertical structure of cloud layers in the atmospheres of giant planets. I. On the influence of variations of some atmospheric parameters on the vertical structure characteristics,” Sol. Syst. Res. 49, 43–50 (2015).
A. Seiff, D. B. Kirk, T. C. D. Knight, et al., “Thermal structure of Jupiter’s atmosphere near the edge of a 5-µm hot spot in the north equatorial belt,” J. Geophys. Res. 103, 22857–22889 (1998).
E. G. Yanovitskii and A. S. Ovsak, “Effective optical depth of absorption line formation in semi-infinite planetary atmospheres,” Kinematika Fiz. Nebesnykh Tel 13 (4), 1–19 (1997).
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Original Russian Text © A.V. Morozhenko, A.S. Ovsak, 2015, published in Kinematika i Fizika Nebesnykh Tel, 2015, Vol. 31, No. 5, pp. 20–29.
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Morozhenko, A.V., Ovsak, A.S. On the possibility of separation of aerosol and methane absorption in the long-wavelength spectral range for giant planets. Kinemat. Phys. Celest. Bodies 31, 225–231 (2015). https://doi.org/10.3103/S0884591315050074
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DOI: https://doi.org/10.3103/S0884591315050074