Attention is drawn to a possible band structure displayed by the known N* resonances. The observed spectrum is similar to that predicted by a paraquark harmonic-oscillator shell model. Exact three-body Schrodinger wave functions are used to compute the Nw and ATT partial decay widths, assuming the pion emission takes place via a one-quark de-excitation. The agreement with experiment is very good.

We show that the presently accepted standard model of the Sun exhibits polytropic power-law behavior P=Kργ over certain regions of the Sun’s interior. We then develop a three-polytype model that gives a good representation of this standard solar model. The model is easily computable.

The principles for determining certain parameters of precipitation particles by means of a radar with two‐channel orthogonal polarization capability are discussed. The parameters are or are related to the mean shape, mean orientation angle, the degree of randomness of the particle orientation, and also to particle size and phase state. The preferred orientation of such particles results in the medium being anisotropic. The propagation aspects of the problem are considered in terms of additional parameters which include the differential attenuation, the differential phase shift, and the tilt angle of the anisotropy axes. Formulas are derived for determining the parameters in terms of radar observables. A limited sample of results from 16.5 GHz data is presented in order to illustrate the radar determination of each parameter.

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Radar observations made with a polarization diversity radar show the existence of a high degree of common orientation of the particles in the upper levels of thunderstorms. Abrupt changes in orientation associated with lightning discharges have frequently been observed, the particles becoming disoriented, or in some cases reoriented, in less than I s. Recovery times of the order of 10-15 s were observed. A consequence of the oriented states is the existence of differential propagation characteristics for radio waves propagating through the medium. A differential phase shift of 2.5ø/km at 1.8-cm wavelength is reported for a thunderstorm.

the paper "On the relationship between the curate. The second to last paragraph of section 7 of degree of preferred orientation in precipitation and the paper should be replaced by the following: dual-polarization radar echo characteristics" by A."It is seen throughout these results that the media Hendry, Y. M. M. Antar, and G. C. McCormick cannot be considered to be equioriented, i.e., the par-(Radio Science, 22(1), 37-50, 1987), incorrect values ticles do not all have a common alignment. The low for two of the quantities which appeared in Table 2 values of ORTT which occur in snow and in the were published. The correct values are as listed melting layer are due to the shape factor and, to a below: lesser degree, to the orientation factor /92 . Only for /92 (Gaussian distribution) 0.729 the heavy rain case is the factor P2 close to unity." [ • I/(CDR) •/2 0.388

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