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排序方式: 共有46条查询结果,搜索用时 15 毫秒
1.
E. B. Fainberg A. V. Kuvshinov L. P. Mishina B. Sh. Singer 《Pure and Applied Geophysics》1990,134(4):527-531
The new approach to global geomagnetic sounding is developed to overcome difficulties of spherical harmonical analysis and subsequent transfer function determination. The approach is based on minimizing the discrepancy between experimental and simulated magnetic fields. The discrepancy is considered as a function of the medium model parameters and the coefficients of external fields. The method can be used for laterally inhomogeneous as well as homogeneous earth models. An example of its application to a radially symmetric model is demonstrated. 相似文献
2.
E.B. Fainberg B.Sh. Singer A.V. Kuvshinov 《Physics of the Earth and Planetary Interiors》1983,32(4):293-300
The results of numerical simulation of electromagnetic fields induced in the world's oceans by solar daily variations are discussed. Some examples of apparent resistivity curves simulated for continental and ocean regions are demonstrated. 相似文献
3.
E. B. Fainberg 《Surveys in Geophysics》1980,4(1-2):157-171
The general state of global investigations of electromagnetic induction in the oceans and also some new results obtained in the past few years in the U.S.S.R. are considered. 相似文献
4.
The positions and motions of solar bursts in the range 20 to 60 MHz have been measured by the means of a sweep-frequency grating interferometer with angular resolution of 5 arc at 60 MHz decreasing to 15 arc at 20 MHz. The positional characteristics of the decameter wavelength bursts are discussed in terms of the commonly accepted theories of the origin of radio bursts from plasma and synchrotron radiations. 相似文献
5.
6.
The field of the vertical electric dipole (VED) immersed in the heterogeneous conductive halfspace (sea) is analyzed in time domain. In the near field of the source, the amplitudes of the electric and magnetic components of the field are proportional to power 3/2 and power 5/2 of the conductivity of the medium, respectively. After termination of the transmitter pulse, all the VED components decay with time as ~1/t 5/2. The possibility of applying the VED field for estimating the electrical properties of the offshore geological sections is demonstrated. 相似文献
7.
We compare recent observations of a solar eruptive prominence as seen in extreme-UV light on 30 March 2010 by the Solar Dynamics Observatory (SDO) with the multi-tube model for interplanetary magnetic clouds (Osherovich, Fainberg, Stone, Geophys. Res. Lett. 26, 2597, 1999). Our model is based on an exact analytical solution of the plasma equilibrium with magnetic force balanced by a gradient of scalar gas pressure. Topologically, this solution describes two magnetic helices with opposite magnetic polarity embedded in a cylindrical magnetic flux tube that creates magnetic flux inequality between the two helices by enhancing one helix and suppressing the other. The magnetic field in this model is continuous everywhere and has a finite magnetic energy per unit length of the tube. These configurations have been introduced as MHD bounded states (Osherovich, Soln. Dannye 5, 70, 1975). Apparently, the SDO observations depict two non-equal magnetically interacting helices described by this analytical model. We consider magnetic and thermodynamic signatures of multiple magnetic flux ropes inside the same magnetic cloud, using in situ observations. The ratio of magnetic energy density to bulk speed solar wind energy density has been defined as a solar wind quasi-invariant (QI). We analyze the structure of the QI profile to probe the topology of the internal structure of magnetic clouds. From the superposition of 12 magnetically isolated clouds observed by Ulysses, we have found that the corresponding QI is consistent with our double helix model. 相似文献
8.
Summary. Asymptotic expressions for components of the electromagnetic field of a grounded electric dipole are considered for the model consisting of a thin surface-layer overlapping a stratified medium with a highly resistive screen on the roof. It is shown that the method of spatial derivatives makes it possible to obtain proper estimates of the impedance at distances of r ≥|λ0 | from the nearest edge of the surface anomaly (|λ0 | being the effective depth of the field penetration in the underlying section). the magnetotelluric methods allow one to obtain the true values of impedance, provided r ≥ max {|λ0 |, |/( S −1 + Z − 0 |1/2 } where S is the integrated conductivity of the surface layer, is the transverse resistance of the screen, and Z − 0 is the Tikhonov—Cagniard impedance for the medium underlying the surface layer. 相似文献
9.
We report the detection and analysis of circular polarization in solar type III radio storms at hectometric-to-kilometric
wavelengths. We find that a small (usually less than 5%), but statistically significant, degree of circular polarization is
present in all interplanetary type III radio storms below 1 MHz. The sense of the polarization, which is right-hand circular
for some storms and left-hand circular for others, is maintained for the entire duration of the type III storm (usually many
days). For a given storm, the degree of circular polarization peaks near central meridian crossing of the associated active
region. At a given time, the degree of circular polarization is found to generally vary as the logarithm of the observing
frequency. The radiation characteristics, including the polarization, for one interplanetary type III storm exhibits an unusual
1.6 hour oscillation. Based on the standard plasma emission theory of type III radiation, we discuss the implications of these
observations for the magnitude and radial dependence of the solar magnetic field above active regions on the Sun. 相似文献
10.
L.L. Vanyan M.N. Berdichewski E.B. Fainberg M.V. Fiskina 《Physics of the Earth and Planetary Interiors》1977,14(2):P1-P2
A generalized curve of the apparent resistivity constructed from global and regional data leads us to suggest that the ancient shields of the East European Platform have no well-developed asthenosphere 相似文献