摘要:

The group‐theoretic consistency of a random variable scaling law implies that the associated spectrum function is proportional to a power of the frequenc

ISSN:0048-6604    

DOI:10.1029/RS006i008p00751

年代:1971

数据来源: WILEY

摘要:

An expression is derived for the difference between the atmospheric refractive index calculated from the monthly averages of pressure, dry bulb temperature, and vapor pressure and as the average of the corresponding daily values. It is shown that the order of differences between them is negligible. The orders of errors introduced in the computed values of refractive index by rounding off the temperature and the pressure values to the nearest integral values are shown to be 2 to 3Nunits.

ISSN:0048-6604    

DOI:10.1029/RS006i008p00753

年代:1971

数据来源: WILEY

摘要:

The addition of phase difference measurements to differential absorption experiments is shown to be both feasible and desirable. The phase information can provide a more sensitive measurement of electron density above about 75 km. The differential phase shift is only weakly dependent on collision frequency in this range, and so an accurate collision frequency profile is not a prerequisite. The differential phase shift and differential absorption measurements taken together can provide both electron density and collision frequency data from about 70 to 90 km.

ISSN:0048-6604    

DOI:10.1029/RS006i008p00757

年代:1971

数据来源: WILEY

摘要:

One particular backscatter signature obtained with an HF narrow‐beam scan backscatter sounder system is analyzed by considering its behavior statistics and applying a three‐dimensional computer ray‐tracing technique. Other simultaneous radio data are used to modify the theoretical model. Results of this investigation indicate that this particular signature probably is the result of medium‐scale traveling ionospheric disturbances which are the ionospheric manifestations of internal atmospheric gravit

ISSN:0048-6604    

DOI:10.1029/RS006i008p00763

年代:1971

数据来源: WILEY

摘要:

This note deals with the measurement of the total electron content of the ionosphere at the Goddard Space Flight Center, looking towards the geostationary satellite ATS 3 during the solar eclipse of March 7, 1970. Obscuration at this site was nearly total. Faraday rotation was measured with a stationary circularly polarized antenna and a dual‐channel phase‐lock receiver tuned to 137.350 MHz. By comparing the electrical phase of the two opposite circularly polarized components, a continuous chart recording was made of Faraday rotation versus local time. A depletion of about 25% in electron content was observed from first contact to the time of minimum electron content. The time variations of the electron content during the eclipse are briefly examined in the light of current theories of ionospheric proces

ISSN:0048-6604    

DOI:10.1029/RS006i008p00769

年代:1971

数据来源: WILEY

摘要:

The expression for the total power radiated by an electron moving in a helical path was derived from Schwinger's general equation for synchrotron radiation. The equation derived was used to predict the synchrotron radiation from incoming auroral electrons at three different stations, one in the auroral zone and the other two at midlatitudes. The results of the calculations for the station in the auroral zone agree with the data observed by Parthasarathy and Berkey at College, Alaska. The synchrotron radiation from the incoming auroral electrons indeed offers an explanation for the observations of auroral noise observed at College, Alaska.

ISSN:0048-6604    

DOI:10.1029/RS006i008p00775

年代:1971

数据来源: WILEY

摘要:

An infinite line source or current‐carrying cable on the surface of a flat homogeneous earth is considered. The integral formula, for the case of negligible displacement currents, is reduced either to tabulated functions or to a form suitable for numerical integration. A table of numerical values of these basic integrals is presented. We also show that, in principle, the relative location of the line source can be deduced from measurements of the subsurface field The results have possible application to mine rescue operation

ISSN:0048-6604    

DOI:10.1029/RS006i008p00781

年代:1971

数据来源: WILEY

摘要:

The radiation of Hertzian dipoles (vertical electric and magnetic and horizontal electric and magnetic) with impulsive currents in the presence of a nondispersive dielectric half‐space is considered. By taking the inverse Fourier transform of the Sommerfeld integrals, exact closed‐form solutions are obtained for particular locations of source and observation points. These solutions contain doublet and delta singularities whose magnitudes and arrival times are determined by geometrical optics followed by smoothly decaying waveforms whose final values are determined by static the

ISSN:0048-6604    

DOI:10.1029/RS006i008p00787

年代:1971

数据来源: WILEY

摘要:

Two different but equivalent multipole methods are applied to the problem of determining the scattering of an electromagnetic wave by a perfectly conducting cylinder over a dielectric half‐space. Numerical results are presented for different sets of parameter values. The results seem to be in good agreement with those obtained by geometrical optics methods for the high‐frequency case, and qualitative results can be obtained by a relatively simple procedure based on geometrical opt

ISSN:0048-6604    

DOI:10.1029/RS006i008p00795

年代:1971

数据来源: WILEY

摘要:

The geometrical theory of diffraction has been applied to analysis of the backscattered fields of a cube in the plane normal to four edges of the cube. The results of this diffraction analysis are used to calculate the backscattered fields at harmonically related frequencies, which are then combined with experimental data and transformed to obtain impulse, step, and ramp responses in the time domain. The inclusion of the calculated high‐frequency data results in a more precise determination of the time‐response waveforms than is possible with only low‐frequency measured data. As an example of the results, the impulse, step, and ramp responses for vertical and horizontal polarization are presented for θ = 0° (specular directio

ISSN:0048-6604    

DOI:10.1029/RS006i008p00801

年代:1971

数据来源: WILEY