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81.
Radiative recombination coefficients for some quadruply and quintuply ionized atoms, present in the Sun and its atmosphere, are investigated in the temperature range 10–104 K by using the method of detailed balance. Simple expressions are given for a quick estimation. 相似文献
82.
The magnetohydrodynamic model of shock waves has been discussed in an atmosphere with gravitation and radiation. The disturbance is headed by a strong shock of increasing density. The medium ahead of the shock is assumed to be inhomogeneous and at rest. Variation of magnetic field radiation flux, and other flow variables are given in tabular form. 相似文献
83.
S. K. Pandey 《Astrophysics and Space Science》1980,71(2):499-506
The investigation of instabilities in a penetrative atmosphere discussed in our earlier paper (Pandeyet al., 1979) is extended to include thermal dissipation in a more realistic approximation. It is shown that the convective modes are not very sensitive to the presence of an overlying stable layer. The overstabilization of gravity modes is, however, found to occur under very stringent conditions, while the acoustic overstability is enhanced by the presence of an overlying stable layer. 相似文献
84.
Similarity solutions describing the flow of a perfect gas behind a cylindrical shock wave with transverse magnetic field are investigated in an inhomogeneous medium. The total energy of the shock wave is assumed to be constant. A comparative study has been made between the results with and without magnetic field. 相似文献
85.
Suresh Chandra 《Astrophysics and Space Science》1983,96(2):455-456
The investigation of Alamet al. (1979), of the temperature distribution in spherically-symmetric transition region and inner corona, appears to be in error. 相似文献
86.
U. S. Pandey 《Astrophysics and Space Science》1988,141(2):251-256
Solutions of magnetofluid accretion disk with negligible self-gravitation have been obtained in the background of the Schwarzschild spacetime for differential as well as rigid rotation. The constraint equations for the magnetic field components have also been derived. It is shown that the magnetic field plays an important role in confining the fluid flow. 相似文献
87.
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90.
Some Bianchi type I viscous fluid cosmological models with a variable cosmological constant are investigated in which the
expansion is considered only in two direction i.e. one of the Hubble parameter
is zero. The viscosity coefficient of bulk viscous fluid is assumed to be a power function of mass density whereas the coefficient
of shear viscosity is considered as constant in first case whereas in other case it is taken as proportional to scale of expansion
in the model. The cosmological constant Λ is found to be positive and is a decreasing function of time which is supported
by results from recent supernovae Ia observations. Some physical and geometric properties of the models are also discussed. 相似文献