Increase in the carbon dioxide infrared emissions during solar proton events     

V. P. Ogibalov  S. N. Khvorostovskii  G. M. Shved 《Geomagnetism and Aeronomy》2006,46(2):151-158

Increase in the nighttime high-latitude nonthermal emissions in the mesosphere and lower thermosphere in the 4.3 and 15 μm CO₂ bands during solar proton events has been estimated for the first time. The estimations have been performed for protons with energies not lower than 1 MeV precipitating into the atmosphere. A strong increase in the 4.3 μm emission can be anticipated during the above events; however, a substantial increase in the 15 μm emission is improbable. The 4.3 μm emission can increase only above approximately 80 km regardless of the energy of precipitating protons. The excitation of CO₂ vibrational states, transitions from which generate the 4.3 μm emission, is caused by the vibrational excitation of N₂ molecules due to collisions with secondary electrons, produced during solar proton events, and the following transfer of this excitation to CO₂(00⁰1) molecules during N₂-CO₂ collisions. Original Russian Text ? V.P. Ogibalov, S.N. Khvorostovskii, G.M. Shved, 2006, published in Geomagnetizm i Aeronomiya, 2006, Vol. 46, No. 2, pp. 159–167.  相似文献   

Effects of Temperature Variations with Height on the Nonequilibrium Populations of Vibrational States of Molecules in Planetary Atmospheres     

A. O. Semenov  G. M. Shved 《Solar System Research》2003,37(4):306-313

The model of the standard problem of radiative transfer in a vibrational–rotational band that we suggested previously (Shved and Semenov, 2001) for a nonlocal thermodynamic equilibrium (non-LTE) in vibrational molecular states is used to study the populations of these states in a nonisothermal planetary atmosphere. The temperature profile in the atmosphere is specified as a temperature perturbation in the form of a Gaussian function that is superimposed on an isothermal atmosphere. We show that the temperature profile has a complex effect on the state populations, which makes it difficult to analytically represent this effect. We investigate the influence of the peculiar features of the temperature profile in an LTE layer on the non-LTE height and suggest a criterion for determining those features that weakly affect this height. Using the populations of the CO₂ 01¹0 and 00⁰1 states in the atmospheres of the Earth and Mars as examples, we show that the formulas suggested for estimating the non-LTE height are efficient.  相似文献   

Penetration of the Earth’s free oscillations at 54 minute period into the atmosphere     

G. M. Shved  L. N. Petrova  O. S. Polyakova 《Annales Geophysicae》2000,18(5):566-572

It is known that the fundamental spheroidal mode ₀S₂ of the Earth free oscillation with a period of about 54 min forces atmospheric oscillations. We present a certain phase relationship for components of the ₀S₂ multiplet, which is based on synchronous collocated microbarograph and seismograph observations. This relationship is both the first observational manifestation of the Pekeris mode of global atmospheric oscillations with the 54 min period and a further proof of the Earths ₀S₂ mode penetrating into the atmosphere. We show that the linear non-dissipative model of steady forced oscillations in isothermal atmosphere at rest does not describe the penetration of the ₀S₂ mode into the atmosphere adequately.  相似文献   

Comparing parametrization of the coefficient of molecular thermal conductivity of the thermosphere     

A. O. Semenov  G. M. Shved 《Geomagnetism and Aeronomy》2008,48(6):787-792

At present, different parametrizations of the molecular thermal conductivity coefficient are used in the models of the dynamics and neutral and ion composition of the thermosphere. These parametrizations have been compared by solving the energy balance equation for medium-global conditions. The spread in estimates reaches ～300 K for temperature of the thermosphere and ～40% for density at an altitude of 300 km. A new parametrization of the molecular thermal conductivity coefficient has been proposed. This parametrization is based on the renewed temperature dependences of molecular conductivity [Uribe et al., 1990] according to measurements in pure N₂ and O₂ gases and on the last theoretical estimates of O atom elastic collision sections [Kharchenko et al., 2000].  相似文献   

A Study of the Column Methane Short-Term Variability in the Atmosphere on a Regional Scale     

M. V. Cherepova  S. P. Smyshlyaev  M. V. Makarova  Yu. M. Timofeyev  A. V. Poberovskiy  G. M. Shved 《Izvestiya Atmospheric and Oceanic Physics》2018,54(6):558-569

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Detection of short-period global waves from nightglow observations     

G. M. Shved  N. V. Karpova  P. P. Ammosov  G. A. Gavrilyeva  V. I. Perminov  A. I. Semenov 《Geomagnetism and Aeronomy》2009,49(3):381-383

Atmospheric temperature oscillations at similar frequencies have been detected in the spectra of variations in the rotational temperatures of the OH and O₂ nighttime emissions, simultaneously observed at two spaced stations in the range of periods ～1–3 h. These oscillations are probably caused by global waves: short-period solar tides and/or free oscillations of the atmosphere.  相似文献