forward scatter


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forward scatter

[¦fȯr·wərd ′skad·ər]
(communications)
Propagation of electromagnetic waves at frequencies above the maximum usable high frequency through use of the scattering of a small portion of the transmitted energy when the signal passes from an unionized medium into a layer of the ionosphere.
Collectively, the very-high-frequency forward propagation by ionospheric scatter and ultra-high-frequency forward propagation by tropospheric scatter communications techniques.
(geophysics)
The scattering of radiant energy into the hemisphere of space bounded by a plane normal to the direction of the incident radiation and lying on the side toward which the incident radiation was advancing.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.

forward scatter

forward scatterclick for a larger image
Troposphere scatter propagation.
The scattering of radiated energy into the hemisphere of space bounded by a plane normal to the direction of the incident radiation and lying on the side toward which the incident radiation was advancing. The opposite of backward scatter. In Rayleigh scattering, forward scatter accounts for half of the total. As the particle size increases above the Rayleigh limit, an increasing fraction of the total scattering is forward scattering. Rayleigh scattering is normal scattering of radiation by particles whose ruling size is 0.1 or less than that of the radiant wavelength. The scattering process may be polarization sensitive (i.e., incident waves that are identical in every respect but their polarization may be scattered differently).
An Illustrated Dictionary of Aviation Copyright © 2005 by The McGraw-Hill Companies, Inc. All rights reserved
References in periodicals archive ?
Similar to a typically forward scatter photodiode, only the voltage changes.
analyzed monocyte subpopulation in the peripheral blood of healthy volunteers and AECOPD patients at the stages of admission and remission after clinical therapy, and they found a dramatic increase of a previously unreported population of large circulating atypical monocytes in AECOPD patients, characterized by higher forward scatter and lower side scatter, higher expression of CD16, intercellular adhesion molecule 1 (ICAM-1) and chemotactic protein-1 receptor-2 (CCR2), and lower expression of MHC class II antigen (HLA-DR) than typical monocytes.
First, we gated cells with high sideward scatter (SSC) and low forward scatter (FSC) [20], and 7-AAD was used to select living cells (Figure 2(a)).
At lease 10,000 lymphocytes were selected for analysis through forward scatter side scatter (FSc / SSc) gating technique.
In this study, passive forward scattering radar is used to detect human crossing through the range of forward scatter region and to differentiate human size.
Hence, to design the proposed phase function, we assumed that light traversals could be classified into two groups of movement: forward scatter and backward scatter.
Cell volume has been estimated from forward scatter, phosphatidylserine-exposure from annexin-V-binding, hemolysis from hemoglobin release, and [[Ca.sup.2+]], from Fluo3-fluorescence.
It provides optical density and forward scatter turbidity measurements in the ultraviolet, visible, and near infra-red ranges.
Current visibility levels are measured using a Forward Scatter Technique in which a flash of xenon light is transmitted a short distance through the atmosphere, which scatters the light.
B, T and NK cells were generally smaller in size (low forward scatter), while CD 14+ monocytes were larger in size (higher forward scatter).
There is also a small number of observers who continue to make forward scatter radio observations of meteors using transmitting stations in Eastern Europe.
and subtracting that from the forward scatter intensity profile due to the droplets in order to get the Sauter mean diameter, [D.sub.32], but it was only used as a quick way to determine if any combustion could be present in the cold, supersonic flow before deciding what the next step should be in exploring this liquid injector/plasma torch setup in preparation for hot-flow tests.

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