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Small angle deflection of waves
Forward scattering is the deflection of waves by small angles so that they continue to move in close to the same direction as before the scattering. It
Forward_scatter
Radio wave detection and transmission system defined by its separation
as a forward scatter radar, after the mechanism by which the transmitted energy is scattered by the target. In forward scatter, the scattering can be
Bistatic_radar
The Forward Scattering Alignment (FSA) is a coordinate system used in coherent electromagnetic scattering indicating direction. The coordinate system
Forward_scattering_alignment
Radio propagation mode
stations up to 2,250 kilometres (1,400 mi) apart. There can be forward-scatter or back-scatter of the radio waves. As the Earth moves along its orbital path
Meteor_burst_communications
Elastic recoil detection analysis (ERDA), also referred to as forward recoil scattering or spectrometry, is an ion beam analysis technique, in materials
Elastic_recoil_detection
Scattering of an electromagnetic plane wave by a sphere
Mie scattering representations In electromagnetism, the Mie solution to Maxwell's equations (also known as the Lorenz–Mie solution, the Lorenz–Mie–Debye
Mie_scattering
Reflection which reverses the direction of a wave, particle, or signal
photography, and medical ultrasonography. The opposite effect is forward scatter, e.g. when a translucent material like a cloud diffuses sunlight, giving
Backscatter
Image artifact in a lens system
imaging mechanism itself, for example through internal reflection and forward scatter from material imperfections in the lens. Lenses with large numbers
Lens_flare
Range of physical processes in physics
In physics, scattering is a wide range of physical processes where moving particles or radiation of some form, such as light or sound, are forced to deflect
Scattering
Model for light scattering
It is particularly valued for its ability to represent strongly forward-scattering media (such as biological tissue or clouds) using a single parameter
Henyey–Greenstein phase function
Henyey–Greenstein_phase_function
backscattering or forward scattering. Backscattering bistatic sonar is the sonar in which the bistatic angle φ is less than 90°. Forward scattering is the physical
Bistatic_sonar
Meteorological condition
overcast in Wiktionary, the free dictionary. Diffuse reflection Forward scatter Light scattering by particles Diffuser (optics) Gloom June Gloom Hard and soft
Overcast
Measure of aircraft visual distance
horizontal visual range instead of slant visual range. In the US, Forward Scatter RVRs are replacing transmissometers at most airports. According to
Runway_visual_range
Meteorological instrumentation
Latest generation transmissometer technology makes use of a co-located forward scatter visibility sensor on the transmitter unit to allow for higher accuracies
Transmissometer
Radio frequency propagation
most common back-scatter applications are air-traffic radar, bistatic forward-scatter guided-missile and airplane-detecting trip-wire radar, and the US space
Airplane_scatter
Automated sensor suites
weather stations use one of two sensor types: forward scatter sensors transmissometers The forward scatter sensor uses a beam of infrared light which is
Automated airport weather station
Automated_airport_weather_station
in a forward scatter radar like the MCL, it travels an almost straight line from the transmitter to receiver. For this reason, the forward scatter signal
AN/FPS-23
Great Comet of 2024
assuming H = 5.2 and 2.5n = 10, and would benefit from the effects of forward scattering. Revised data from June 2024 suggested that the comet would brighten
Comet_Tsuchinshan–ATLAS
Soviet radar detector
of forward scatter in which the radar cross section of even a stealth aircraft can become very large for a few moments. However, achieving forward scatter
Kolchuga_passive_sensor
Meteorological optical phenomenon
dimmer than crepuscular rays because backscattering is less than forward scattering. Anticrepuscular rays can be continuous with crepuscular rays, curving
Anticrepuscular_rays
Bi-national military alliance
the Defense Support Program (DSP) formerly called Project 647; the Forward Scatter over the Horizon Radar (440L AN/FRT-80 transmitter, AN/FSQ-76 receiver)
NORAD
Physics technique
is possible to derive the real part and the imaginary part of the forward scattering field from each particle. The technique was developed to measure aerosols
Single particle extinction and scattering
Single_particle_extinction_and_scattering
Lab technique in biology and chemistry
metabolism, signaling, and oxidative stress. Light scattering: Forward scatter (FSC) and side scatter (SSC) measures are used in flow cytometry to assess
Flow_cytometry
Technique for determining size distribution of particles
Side scattering detection (90°) is recommended for weakly scattering samples, including small particles and transparent samples. Finally, forward scattering
Dynamic_light_scattering
Kreutz sungrazer comet
(100,000 mi) from the surface of the Sun. When near the Sun, the forward scattering of light would have made the comet significantly brighter, but hard
C/2026_A1_(MAPS)
equations. The alternative coordinate system in electromagnetic scattering is the Forward Scattering Alignment (FSA) which is primarily used in optics. Both coordinate
Back_scattering_alignment
Electron-photon scattering cross section
more likely to scatter in the forward direction. For high energy photons it is useful to distinguish between small and large angle scattering. For large angles
Klein–Nishina_formula
Physical interaction of charged particles
Coulomb scattering is the elastic scattering of charged particles by the Coulomb interaction. The physical phenomenon was used by Ernest Rutherford in
Coulomb_scattering
Lithographic technique that uses a scanning beam of electrons
move forward, they have an increasing opportunity to scatter laterally from the beam-defined location. This scattering is called "forward scattering". Sometimes
Electron-beam_lithography
Method for solving certain nonlinear partial differential equations
transformed to scattering data (direct scattering transform), the scattering data evolves forward in time (time evolution), and the scattering data reconstructs
Inverse_scattering_transform
Time of day when the sun appears above the horizon
clouds, and also for the daytime halo of white light around the Sun (forward scattering of white light). Sunset colors are typically more brilliant than sunrise
Sunrise
Photographic technique
considered silhouetted when there is a lighting ratio of 16:1 or more. Forward scatter High dynamic range Freeman, Michael (2007). The Complete Guide to Light
Contre-jour
scatter geometry the ring thickness is 80–160 km, increasing somewhat in the direction of Jupiter. The ring appears to be much thicker in the forward-scattered
Rings_of_Jupiter
Daily falling of the Sun below the horizon
clouds, and also for the daytime halo of white light around the Sun (forward scattering of white light). Sunset colors are typically more brilliant than sunrise
Sunset
Scanning electron microscopy technique
elastically diffracted and lose energy, leaving the sample at various scattering angles before reaching the phosphor screen forming Kikuchi patterns (EBSPs)
Electron backscatter diffraction
Electron_backscatter_diffraction
Phase space measurement with forward modeling is one approach to address the scattering issue in biomedical imaging. Scattering is one of the biggest problems
Phase space measurement with forward modeling
Phase_space_measurement_with_forward_modeling
Observation of distant objects on Earth's surface or terrestrial features
then its observation conditions are the worst. Because of the forward light scattering the haze concentrated nearby, the solar azimuth has a whitish appearance
Long_distance_observations
Fictional device
per sample, enabling discrimination of sample populations based on forward scatter (size) and fluorescence intensity across multiple channels. The first
Tricorder
Great Comet of 2007
peak. The brightness of C/2006 P1 near perihelion was enhanced by forward scattering. McNaught discovered the comet in a CCD image on 7 August 2006 during
Comet_McNaught
Species of bear native to the Arctic
animals to trap heat and float in the water. The transparent guard hairs forward scatter ultraviolet light between the underfur and the skin, leading to a cycle
Polar_bear
Oort cloud comet
entered forward-scattering geometry from STEREO-B, SOHO, and Earth. Had the comet not disintegrated, it would have allowed the dust scattering function
C/2010_X1_(Elenin)
crosslinking (for negative resists) come from electron forward scattering and backscattering. The forward scattering process is due to electron-electron interactions
Proximity effect (electron beam lithography)
Proximity_effect_(electron_beam_lithography)
Canadian radar defence line
(DRB) a system that avoided both of these problems. Known today as a forward scatter bistatic radar, it used two antennas, a transmitter and receiver, separated
Mid-Canada_Line
Topics referred to by the same term
Finite-state automaton Forward scattering alignment Fire Services Act (disambiguation) Flying Saucer Attack, an English rock band Forward Sortation Area, part
FSA
like a strong enhancement of the forward-scattering at the wavelength 3.6 cm near ring's apoapsis. Such strong scattering requires the existence of a coherent
Rings_of_Uranus
Scattering phenomenon in wave dynamics
dynamics, that produces a tree-like pattern involving successive mostly forward scattering events by smooth obstacles deflecting traveling rays or waves. Sudden
Branched_flow
1990 multi-vehicle traffic collision in Tennessee, United States
8 km) of the highway north and south of the Hiwassee River with nine forward scatter visibility sensors, 14 microwave radar vehicle detectors, and 21 closed-circuit
1990 Interstate 75 fog disaster
1990_Interstate_75_fog_disaster
Probability of a given process occurring in a particle collision
Rayleigh scattering, the intensity scattered at the forward and backward angles is greater than the intensity scattered sideways, so the forward differential
Cross_section_(physics)
Military unit
Program (DSP satellites, ground systems, etc. of Project 647) "OTH Forward Scatter Missile Detection System" (440L System of Program 673A with international
Missile_Warning_Center
ISBN 978-1-84884-187-1. Bowyer 1979, p. 149. Thomas, Roger C (1997). "NATO Forward Scatter Station, RAF Stenigot, Lincolnshire". Historic England Research Reports
Royal_Air_Force_station
Topics referred to by the same term
Start Schools Programme, a programme for schools in South Africa Forward Scattering Spectrometer Probe, a class of optical instruments designed to measure
FSSP
Routine laboratory test of blood cells
structure. Cells scatter light at different angles as they pass through the beam, which is detected using photometers. Forward scatter, which refers to
Complete_blood_count
Type of radio propagation
mountainous terrain. The most common back-scatter applications are air-traffic radar, bistatic forward-scatter guided-missile and airplane-detecting trip-wire
Non-line-of-sight_propagation
Optical phenomenon of the sky
Combined with other near-forwards scattering effects described by Mie scattering, this gives a diffraction pattern around the forward direction in concentric
Corona_(optical_phenomenon)
Oort cloud comet
and the brightness of the dust tail was significantly enhanced by forward scattering. It reached solar conjunction on 25 April 2026 around 05:23 UT when
C/2025_R3_(PanSTARRS)
Multinational X-ray research laser facility in Germany
jet apparatus to study diluted samples, molecules and chemicals. Forward-scattering Fixed-Target (FFT): a solid samples chamber equipped with an electromagnet
European_XFEL
Form of electromagnetic radiation
[citation needed] Rayleigh scattering is the dominant elastic scattering mechanism in the X-ray regime. Inelastic forward scattering gives rise to the refractive
X-ray
Glow seen in Lunar sky during Sunset
of >500 V cm−1. This cloud of dust, near the lunar terminator line, forward scatters the light, creating a glow near the horizon during lunar sunset. Dust
Lunar_horizon_glow
Particle physics process affecting neutrinos
current weak interaction's elastic forward scattering of the electron neutrinos. This coherent forward scattering is analogous to the electromagnetic
Mikheyev–Smirnov–Wolfenstein effect
Mikheyev–Smirnov–Wolfenstein_effect
Great Comet of 2025
than 10 mag). G. van Buitenen predicted −4 magnitude, accounting for forward scattering, however it was just 5 degrees from Sun at peak magnitude. The comet
C/2024_G3_(ATLAS)
Topics referred to by the same term
set, in mathematics Hexafluorosilicic acid, in chemistry Hydrogen forward scattering, in materials science Hyperfine structure, in physics French Frigate
HFS
Clouds occurring in the stratosphere in high-latitude regions
stratosphere and lead to the formation of lenticular (lens-shaped) PSCs. Forward scattering of sunlight within the clouds produces a pearly-white appearance.
Polar_stratospheric_cloud
Hyperbolic comet
and quickly became better seen from the southern hemisphere. The forward scattering of light helped the comet to briefly brighten to as much as magnitude
C/2021_A1_(Leonard)
US Air Force research laboratory in Rome, New York
Program 673A research resulted in the 440L System Program Office for the Forward Scatter Over-the-Horizon network (AN/FRT-80 transmitters & AN/FSQ-76 receivers)
Rome_Laboratory
Experiments proving existence of atomic nuclei
The Rutherford scattering experiments were a landmark series of experiments by which scientists learned that every atom has a nucleus where all of its
Rutherford scattering experiments
Rutherford_scattering_experiments
flutter (electronics and communication) - FM DX - Forbush decrease - forward scatter - free space - free-space path loss - frequency of optimum transmission
Index of radio propagation articles
Index_of_radio_propagation_articles
System, was an extension of the US Distant Early Warning system tropo-scatter communications network. ACE High provided long-range communications for
List of former Royal Air Force stations
List_of_former_Royal_Air_Force_stations
Angle between the light incident on, and reflected from, an astronomical object
than 90° represent backscattering; values greater than 90° represent forward scattering. For some objects, such as the Moon (see lunar phases), Venus and
Phase_angle_(astronomy)
Forschungsreaktor 2 (FR2) Forschungszentrum Jülich Forward-swept wing Forward scatter Forward scattering alignment Fossil stellar magnetic field Foster's
Index_of_physics_articles_(F)
Spectroscopy technique
mass and the average size of molecules in solution, by detecting how they scatter light. A collimated beam from a laser source is most often used, in which
Multiangle_light_scattering
Shade of orange
clouds, and also for the daytime halo of white light around the Sun (forward scattering of white light). Sunset colors are typically more brilliant than sunrise
Sunset_(color)
Disintegrating exoplanet
before transit, which can be explained by the dust grains causing forward scatter. In addition to the dust tail, a cloud of partially ionized sodium
KOI-2700b
Analyzing a sample by studying trajectories of radiation passing through it
scattering is particularly useful because of the dramatic increase in forward scattering that occurs at phase transitions, known as critical opalescence, and
Small-angle_scattering
Observing nearby astronomical objects by analyzing reflected microwaves
Skirmante, Karina; Jasmonts, Gints; Šteinbergs, Jānis (2023). The forward scatter radar method for detecting space objects using emission of extraterrestrial
Radar_astronomy
Mathematical model for turbulence
the transfer of energy from resolved to unresolved scales is called forward-scatter). Large eddy simulation involves the solution to the discrete filtered
Large_eddy_simulation
Faint solar glow caused by interplanetary dust at sunset and sunrise
The light scattered from extremely small dust particles is strongly forward scattering, although the zodiacal light actually extends all the way around the
Zodiacal_light
Deflection of high-energy photons
Even at very forward scattering angles, where Delbrück is very strong, there is a substantial interference with the Rayleigh scattering, the amplitudes
Delbrück_scattering
Sungrazing comet
substantially smaller than the Sun in volume,[citation needed] but the forward scattering of light made the comet appear significantly brighter. The comet SOHO
96P/Machholz
Concentrations of dust in the Earth–Moon system
Moon is 0.53°. Munro, R. H.; et al. (September 1975). "A search for forward scattering of sunlight from lunar libration clouds". Planetary and Space Science
Kordylewski_cloud
Slovak astronomer
complex. He made multiple meteor observations and data analyses on forward scatter radar at Modra Observatory and backscatter radar at Ondřejov Observatory
Vladimír_Porubčan
Nanoscale orientation mapping method
incoherent scattering of the primary beam followed by coherent scattering of these forward biased electrons. TKD has also been applied to analyse fine-grained
Transmission Kikuchi diffraction
Transmission_Kikuchi_diffraction
Nuclear reaction between a neutrino and an atomic nucleus
In nuclear and particle physics, coherent elastic neutrino-nucleus scattering, commonly abbreviated to CEvNS (pronounced /ˈsɛvəns/ like "seven-s"), is
Coherent elastic neutrino-nucleus scattering
Coherent_elastic_neutrino-nucleus_scattering
One of nine detector experiments at CERN
"Odderon Exchange from Elastic Scattering Differences between pp and ppbar Data at 1.96 TeV and from pp Forward Scattering Measurements". Physical Review
TOTEM_experiment
Astronomical and meteorological observatory in the Tatra Mountains, Slovakia
Archived from the original on 8 June 2023. Retrieved 7 January 2025. "Forward-Scatter Radar facility". Archived from the original on 17 June 2008. "A New
Skalnaté_pleso_Observatory
collection of meteor event data. The same method forms the basis for most forward scatter automated detection systems used today, although other methods are
Walter_Scott_Houston
Planet with environment similar to Earth's
Mallama, A.; Wang, D.; Howard, R.A. (2006). "Venus phase function and forward scattering from H2SO4". Icarus. 182 (1): 10–22. Bibcode:2006Icar..182...10M.
Earth_analog
Charged particle acceleration technique
plasma wave is achieved by a laser pulse modulated by stimulated Raman forward scattering instability. Laser–solid-target-based ion acceleration has become
Plasma_acceleration
Great Comet of 1861
magnitude 0 and −2 with a tail of over 90 angular degrees. As a result of forward scattering, C/1861 J1 even cast shadows at night (Schmidt 1863). During the night
C/1861_J1_(Tebbutt)
Historic US military computer and radar network
the Defense Support Program (DSP) formerly called Project 647; the Forward Scatter over the Horizon Radar (440L system); the Sea-Launched Ballistic Missile
Semi-Automatic Ground Environment
Semi-Automatic_Ground_Environment
from optical scattering media. With current applications primarily in medical imaging, has the advantage of a higher range since forward scattered light
Multiple scattering low coherence interferometry
Multiple_scattering_low_coherence_interferometry
Former U.S. Air Force major command
Spacetrack Analysis Center at Colorado Springs." On 31 December 1965, Forward Scatter Over-the-Horizon network data from the 440L Data Reduction Center was
Aerospace_Defense_Command
Matrix decomposition
coordinate system is defined from the wave's viewpoint, known as the Forward Scattering Alignment (FSA), and gives rise to a regular eigenvalue equation,
Eigendecomposition of a matrix
Eigendecomposition_of_a_matrix
Scattering of a radiation wave as it travels through a complex medium
"input" and "output" scatterers. Back scattering alignment (BSA), a coordinate system most commonly used in radar Forward scattering alignment (FSA), a
Coherent_backscattering
Spectroscopy technique
back-scattering of light by a material, while transmission is the passage of light through a material. The word remission implies a direction of scatter,
Diffuse reflectance spectroscopy
Diffuse_reflectance_spectroscopy
an in-air sample environment and operation. Scattering angles are small and diffraction directed forward allows for simple detector setups. High energy
High-energy_X-rays
Innovators white team takes drastic action and deletes all the files, scattering them across the web. 31 "Aim for the Akihabara Kingdom" Transliteration:
List of Danball Senki episodes
List_of_Danball_Senki_episodes
Process of calculating the causal factors that produced a set of observations
important efforts have been devoted to a "direct solution" of the inverse scattering problem especially by Gelfand and Levitan in the Soviet Union. They proposed
Inverse_problem
Proposed technological device
toward the beam-source. The underlying physics is the maximization of forward scattering via interference of the radiation multipoles. They show explicitly
Tractor_beam
Estimating waterborne bacteria abundance
of particle. Scattered light is classified into either forward scatter (FSC) or side scatter (SSC). The former has been associated with cell volume and
Bacterioplankton counting methods
Bacterioplankton_counting_methods
Hypothetical particle composed of gluons
"Odderon Exchange from Elastic Scattering Differences between pp and pp Data at 1.96 TeV and from pp Forward Scattering Measurements". Physical Review
Glueball
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