Computations of scattering cross sections for composite surfaces and the specification of the wavenumber where spectral splitting occurs

EM models for evaluating rain perturbation on the NRCS of the sea surface observed near nadir

“…11 are reported in the Appendix. In the backscattering case, ' i~ = v, 9, + v, 9, + vu a, = 2k iif, where k is the free space wavenumber of the EM wave [21], and ii' = -Ef, where iif = -sin6 . ax + cos6 .…”

Acoustic Scattering Cross Sections for Truly Composite Wind-Wave Surfaces. Scattering without Bubbles.

“…(The associated "tilt-factor" here, however, vanishes with vanishing grazing angle (eoT ' '/2.) An insightful justification of this procedure, from a more general theoretical viewpoint, has been given recently by Bahar,Barrick,and Fitzwalter [24], [25], in the analogous but more complex situation of electromagnetic scattering from (simple, i.e., single component) wave surfaces. (4) We develop, and employ, a correlation function and corresponding intensity wave number spectrum for the soliton waves, obtaining estimates which indicate the potentiality of the new mechanisms here.…”

“…(4) We develop, and employ, a correlation function and corresponding intensity wave number spectrum for the soliton waves, obtaining estimates which indicate the potentiality of the new mechanisms here. This Report is organized as follows: Section 2 provides a detailed analytical summary of the mono-and bi-static scattering cross sections, for high and low frequencies (i.e., large and small Rayleigh numbers), and includes comparisons with the results of Tolstoy and -"-Clay [9], McDaniel and Gorman [4], Kur'yanov [21], [1], and Bahar et al [25). In Section 3 some preliminary numerical results are obtained, based on the soliton wave model described in Sec.…”

“…Barrick and Bahar [5], [22], [23], [25]. [30], [31] A little later than Tolstoy and Clay [9], and by a different approach, Barrick [5] obtained the high-frequency or "optimal-limit" contribution, namely the so-called "specular-point" scattering component of the total scattering cross section This is the incoh* first term of (2.13).…”

“…We remark, however, that in the case of ocean wave-surfaces, Bahar et al [25] use a single (i.e., gravity-capillary) wave surface, which is then artificially split into two components for analytic convenience (cf. [23], [24), also).…”