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Measure of radiant energy over time
radiant flux or radiant power is the radiant energy emitted, reflected, transmitted, or received per unit time, and spectral flux or spectral power is
Radiant_flux
Spectral flux is a measure of how quickly the power spectrum of a signal is changing, calculated by comparing the power spectrum for one frame against
Spectral_flux
Electromagnetic energy transfer rate
In spectroscopy, spectral flux density is the quantity that describes the rate at which energy is transferred by electromagnetic radiation through a real
Spectral_flux_density
Measure of radiant energy over surface area
with radiant intensity. In astrophysics, irradiance is called radiant flux. Spectral irradiance is the irradiance of a surface per unit frequency or wavelength
Irradiance
Mathematical concept applicable to physics
Fluid dynamics Flux capacitor Flux footprint Flux pinning Flux quantization Gauss's law Inverse-square law Jansky (non SI unit of spectral flux density) Latent
Flux
Measurement of electromagnetic radiation (esp. optical radiation)
them using the radiant flux as an example: Integral flux, whose unit is W: Φ e . {\displaystyle \Phi _{\mathrm {e} }.} Spectral flux by wavelength, whose
Radiometry
Capacity of an object to reflect light
flux reflected by that surface and Φei is the radiant flux received by that surface. The spectral hemispherical reflectance in frequency and spectral
Reflectance
Unit of spectral flux density
The jansky (symbol Jy, plural janskys) is a non-SI unit of spectral flux density, or spectral irradiance, used especially in radio astronomy. It is equivalent
Jansky
Physical quantity in radiometry
In radiometry, radiance is the radiant flux emitted, reflected, transmitted or received by a given surface, per unit solid angle per unit projected area
Radiance
Effectiveness of a material in transmitting radiant energy
incident radiation; Φe,νi is the spectral radiant flux in frequency received by that surface; Φe,λt is the spectral radiant flux in wavelength transmitted by
Transmittance
Amount of power radiated through a given area
magnitude and spectral class of a star and in meteorology to determine the intensity of the convection in the planetary boundary layer. Radiative flux also acts
Radiative_flux
Intensity of electromagnetic radiation
radiant intensity is the radiant flux emitted, reflected, transmitted or received, per unit solid angle, and spectral intensity is the radiant intensity
Radiant_intensity
Astronomical magnitude system
other magnitude systems, it is based on flux measurements that are calibrated in absolute units, namely spectral flux densities. The monochromatic AB magnitude
AB_magnitude
Ability of a material to absorb radiant energy
spectral radiant flux in frequency absorbed by that surface; Φ e , ν i {\displaystyle \mathrm {\Phi _{e,\nu }^{i}} } is the spectral radiant flux
Absorptance
Incident radiant energy per area
W or E for radiant energy, P or F for radiant flux, I for irradiance, W for radiant exitance. Spectral quantities given per unit frequency are denoted
Radiant_exposure
Radiant flux per unit area
or radiant emittance is the radiant flux emitted by a surface per unit area, whereas spectral exitance or spectral emittance is the radiant exitance of
Radiant_exitance
Measurement describing the power of an illumination
\lambda }}} where M(λ) is the spectral irradiance (or exitance) of the light (SI units: W/m3 = kg·m−1·s−3); Φ is the radiant flux of the source (SI unit: watt
Spectral_power_distribution
Light or sound absorption in a substance
}}{\mathrm {d} z}},} where Φe,ν is the spectral radiant flux in frequency; Φe,λ is the spectral radiant flux in wavelength. The directional attenuation
Attenuation_coefficient
Energy carried by electromagnetic or gravitational radiation
W or E for radiant energy, P or F for radiant flux, I for irradiance, W for radiant exitance. Spectral quantities given per unit frequency are denoted
Radiant_energy
Capacity of an object to radiate electromagnetic energy
body at the same temperature as that surface. Spectral hemispherical emissivity in frequency and spectral hemispherical emissivity in wavelength of a surface
Emissivity
Amount of light captured by a camera
W or E for radiant energy, P or F for radiant flux, I for irradiance, W for radiant exitance. Spectral quantities given per unit frequency are denoted
Exposure_(photography)
Unit of spectral flux density
The solar flux unit (sfu) is a non-SI unit of spectral flux density often used in solar radio observations, such as the F10.7 solar activity index. It
Solar_flux_unit
Measurement of visible light
luminous flux) are related to their radiometric analogs (e.g., radiant flux) through standardized luminous efficiency functions that model the spectral sensitivity
Photometry_(optics)
Measure in astronomy
In astronomy, the spectral index of a source is a measure of the dependence of radiative flux density (that is, radiative flux per unit of frequency) on
Spectral_index
Radiance of a surface
(radiative) intensity with respect to solid angle, used for the definition of spectral flux density, are singular for exactly collimated beams, or may be viewed
Spectral_radiance
Light measurement tool
spectrometer is then able to provide measurements of spectral irradiance, spectral radiance and/or spectral flux. This data is also then used with built in or
Spectroradiometer
Energy conversion in optics
W or E for radiant energy, P or F for radiant flux, I for irradiance, W for radiant exitance. Spectral quantities given per unit frequency are denoted
Wall-plug_efficiency
Physical quantity in radiometry
radiometry, radiosity is the radiant flux leaving (emitted, reflected and transmitted by) a surface per unit area, and spectral radiosity is the radiosity of
Radiosity_(radiometry)
Metric for aggregate satellite interference used in spectrum-sharing regulation
orbit (GSO) receiving station. It generalizes the simpler concept of spectral flux density to systems with many simultaneously visible transmitters. EPFD
Equivalent_power_flux_density
Radiant energy per unit volume
W or E for radiant energy, P or F for radiant flux, I for irradiance, W for radiant exitance. Spectral quantities given per unit frequency are denoted
Radiant_energy_density
Beginning of a musical note or sound
and include looking for: Increases in spectral energy Changes in spectral energy distribution (spectral flux) or phase Changes in detected pitch - e
Onset_(audio)
Topics referred to by the same term
Caicos, IATA airline designator JY Jansky (symbol Jy), a non-SI unit of spectral flux density Japanese yen, a currency unit Jia Yu Channel, a 24-hour Mandarin
JY
Any monochromatic spectral light that evokes the corresponding perception of hue
described by their peak wavelength—the wavelength of highest radiometric spectral flux (highest peak in the power spectrum)—but the dominant wavelength is
Dominant_wavelength
Spectral density of light emitted by a black body
thermodynamic equilibrium obeys Lambert's cosine law. This means that the spectral flux dΦ(dA, θ, dΩ, dν) from a given infinitesimal element of area dA of the
Planck's_law
Measurement of radiant electromagnetic power emitted by an object
stars, while others such as the AB system are defined in terms of a spectral flux density. A star's luminosity can be determined from two stellar characteristics:
Luminosity
Formula for radiative heat transfer
coefficient for spectral flux (a beam of radiation with a single wavelength, [W/m2/μm]) differs from the absorption coefficient for spectral intensity [W/sr/m2/μm]
Schwarzschild's equation for radiative transfer
Schwarzschild's_equation_for_radiative_transfer
Concept relating to waves and signals
of stars based on their characteristic electromagnetic spectra. The spectral flux density is used to represent the spectrum of a light-source, such as
Spectrum_(physical_sciences)
SI derived unit of visible light emission
spectrum) has luminous flux of 683 lumens. So a lumen represents at least 1/683 watts of visible light power, depending on the spectral distribution. Lamps
Lumen_(unit)
Relation between peak wavelengths of black body radiation and temperature
temperature. This is a consequence of the strong statement of Wien's law. For spectral flux considered per unit frequency d ν {\displaystyle d\nu } (in hertz),
Wien's_displacement_law
Audio analyser software
and return values for display. There are plugins which compute spectral flux and spectral centroid. Other plugins include automatic melody extraction, beat
Sonic_Visualiser
Classification of stars based on spectral properties
stellar classification is the classification of stars based on their spectral characteristics. Electromagnetic radiation from the star is analyzed by
Stellar_classification
Plot of energy and frequency or wavelength
A spectral energy distribution (SED) is a plot of energy versus frequency or wavelength of electromagnetic or mechanical radiation, most commonly light
Spectral_energy_distribution
Quasar often used for calibration
than 15 kiloparsecs (13.7 in the case of 3C 286), and the observed spectral flux density is proportional to να, where ν is the frequency and α ≤ -0.5
3C_286
Device that emits light via optical amplification
interaction. The probability of interaction is proportional to the spectral flux density of the electromagnetic field, ρ ( ν , T ) . {\displaystyle \rho
Laser
Quantities describing probability of absorption or emission of light
interaction. The probability of interaction is proportional to the spectral flux density of the electromagnetic field, ρ ( ν , T ) . {\displaystyle \rho
Einstein_coefficients
Audio programming language
input, and produce metadata analysis results as output - ie FFT/IFFT, Spectral Flux/Centroid, RMS, etc. Serial IO capabilities - ie Arduino. File IO capabilities
ChucK
Technology for sentiment analysis
multimodal sentiment analysis are mel-frequency cepstrum (MFCC), spectral centroid, spectral flux, beat histogram, beat sum, strongest beat, pause duration,
Multimodal_sentiment_analysis
Range of light usable for photosynthesis
Photosynthetically active radiation (PAR) designates the spectral range (wave band) of solar radiation from 400 to 700 nanometers that photosynthetic organisms
Photosynthetically active radiation
Photosynthetically_active_radiation
How efficiently a source produces visible light
} where Φv is the luminous flux; Φe is the radiant flux; Φe,λ is the spectral radiant flux; K(λ) = KmV(λ) is the spectral luminous efficacy. Artificial
Luminous_efficacy
Blazar in the constellation Eridanus
radio structure. It is made up of a compact radio core with a projected spectral flux density of 2.8 Jansky and a jet component located at a position angle
PKS_0208−512
Logarithm of ratio of incident to transmitted radiant power through a sample
the spectral radiant flux in frequency transmitted by that material; Φ e , ν i {\textstyle \Phi _{\mathrm {e} ,\nu }^{i}} is the spectral radiant flux in
Absorbance
Excess artificial light in an environment
restrictions on the emitted wavelengths, particularly by shifting the spectral flux towards the blue side of the scotopic band (below 440 nm), to protect
Light_pollution
Irregular galaxy in the Hydra constellation
never-before-observed object, that has a spectral flux density of 28×10−26 W·m2/Hz (equivalent to 28 fu, the unity of flux density used in astronomy). Between
MRC_1138−262
Physics concept regarding radiation transparency and attenuation
transmitted spectral radiant fluxes in wavelength; T λ {\displaystyle T_{\lambda }} is the spectral transmittance in wavelength. Spectral absorbance relates
Optical_depth
Electromagnetic radiation generated by the thermal motion of particles
describes the spectrum of black-body radiation, and relates the radiative heat flux from a body to its temperature. Wien's displacement law determines the most
Thermal_radiation
as musical timbre. Classical timbre’ NLDs are roughness, spectral centroid, and spectral flux. While harmonicity and inharmonicity can also be considered
Harshness
Formula about X-ray emission spectra
Kramers' law is a formula for the spectral distribution of X-rays produced by an electron hitting a solid target. The formula concerns only bremsstrahlung
Kramers'_law
BL Lacertae object located in the constellation Serpens
; Tanzi, E. G. (January 1993). "The Ultraviolet--to--Near-Infrared Spectral Flux Distribution of Four BL Lacertae Objects". The Astrophysical Journal
PKS_1538+149
Ratio of how much light is reflected back from a body
seconds (as obtained from flux measurements) to daily, monthly, or annual averages. Unless given for a specific wavelength (spectral albedo), albedo refers
Albedo
Type of digital electronic device
In electronics, rapid single flux quantum (RSFQ) is a digital electronic device that uses superconducting devices, namely Josephson junctions, to process
Rapid_single_flux_quantum
Astronomical observatory satellite
photometric calibration was accomplished by observing standard stars whose spectral fluxes had previously been calibrated by other means. Both echelle-spectrograph/camera
International Ultraviolet Explorer
International_Ultraviolet_Explorer
Atmospheric measurement technique
co-spectral correction, especially noticeable with closed-path instruments and at low heights below 1 to 1.5 m. In mathematical terms, "eddy flux" is
Eddy_covariance
Interdisciplinary research area between musicology and computer science
higher level audio features. Low-level audio features refer to loudness, spectral flux, and cepstrum. Mid-level audio features refer to pitch, onsets, and
Computational_musicology
SI derived unit of illuminance
The lux (symbol: lx) is the unit of illuminance, or luminous flux per unit area, in the International System of Units (SI). It is equal to one lumen per
Lux
Broad-line radio galaxy located in the constellation Lyra
flux was found to be constant during the outburst onset, it displayed increased levels at 2.28 μm in 1978. Furthermore, the extension of the spectral
3C_382
Star in the constellation Scutum
DFK 1's bolometric luminosity, based on Spectral energy distribution (SED) integration, using published fluxes and a distance of 5.8 kpc, yields an even
Stephenson_2_DFK_1
Periodic change in the Sun's activity
models that employ magnetic flux continuity equations and observed sunspot numbers to quantify the emergence of magnetic flux from the top of the solar
Solar_cycle
Device that approximates natural sunlight
Solar Spectral Irradiance Tables". www.astm.org. Gallo, Alessandro; Marzo, Aitor; Fuentealba, Edward; Alonso, Elisa (1 September 2017). "High flux solar
Solar_simulator
Sensor which measures heat transfer
heat flux. The heat flux can have different origins; in principle, convective, radiative, as well as conductive heat can be measured. Heat flux sensors
Heat_flux_sensor
Device that measures magnetism
magnetometers that use irregular, composite and wide spectral lines and helium with the inherently wide spectral line. Magnetometers based on helium-4 excited
Magnetometer
Cold regions surrounding impact craters
derive surface kinetic temperatures to a precision of 1–2 K. Using seven spectral channels spanning the visible spectrum and infrared wavelengths, Diviner
Cold_spot_(astronomy)
Star in the constellation Cygnus
3847/1538-4365/ac7e57. S2CID 251864022. Pickles, A. J. (1998). "A Stellar Spectral Flux Library: 1150-25000 Å". Publications of the Astronomical Society of
HD_191806
Sensor for measuring thermal radiation
Gardon gauges usually cover that spectrum with a spectral sensitivity that is as “flat” as possible. For a flux density or irradiance measurement it is required
Gardon_gauge
Type of weathering
Apollo program, particularly the lunar soils (or regolith). The constant flux of high energy particles and micrometeorites, along with larger meteorites
Space_weathering
Class of units of measurement
jansky (Jy) is a unit of spectral irradiance equal to 10−26 W⋅m−2⋅Hz−1 (10 rW⋅m−2⋅Hz−1). The solar flux unit is a unit of spectral irradiance equal to 10−22 W⋅m−2⋅Hz−1
List_of_metric_units
Star in the Sunburst galaxy
combined with an estimated magnification of at least a factor of 2000. Some spectral features in Godzilla resemble those of other variable stars in the Milky
Godzilla_(star)
Brightenings in the Sun's photosphere
observed in the wings of the Hα, Hβ, and Hγ hydrogen spectral lines and take place in emerging flux regions where emerging magnetic fields interact with
Ellerman_bomb
Body of interstellar clouds
emission spectrum nebulae are nearly always associated with stars having spectral classifications of B or hotter (including all O-type main sequence stars)
Nebula
Nuclear research reactor in Oak Ridge, Tennessee
The High Flux Isotope Reactor (HFIR) is a nuclear research reactor at Oak Ridge National Laboratory (ORNL) in Oak Ridge, Tennessee, United States. Operating
High_Flux_Isotope_Reactor
Measurement unit derived from basic metric value
watt per cubic metre W/m3 spectral irradiance, power density m−1⋅kg⋅s−3 joule per square metre second J/(m2⋅s) energy flux density kg⋅s−3 reciprocal pascal
SI_derived_unit
Light emitted by the Sun
sunlight has a luminous efficacy of about 93 lumens per watt of radiant flux. This is higher than the efficacy (of source) of artificial lighting other
Sunlight
Ratiometric definition of luminance
the photometric definition of luminance L {\displaystyle L} including spectral weighting for human vision, but while luminance L {\displaystyle L} is
Relative_luminance
Argument in astrophysics against the theory of an unchanging universe
in two forms: flux within the universe and the brightness along any line of sight. The two forms have different resolutions. The flux form can be shown
Olbers'_paradox
Frequencies of light emitted by atoms or chemical compounds
spaced groups of many different spectral lines, known as spectral bands. Unresolved band spectra may appear as a spectral continuum. Light consists of electromagnetic
Emission_spectrum
energy flux will lead to a better understanding of the lower troposphere, which interacts with the surface in the Arctic. Performed heat flux measurements
MOSAiC_Expedition
Measurement of electromagnetic radiation
surface element perpendicular to the Sun. Spectral versions of the above irradiances (e.g. spectral TSI, spectral DNI, etc.) are any of the above with units
Solar_irradiance
NASA experiment to measure radiation from the Sun
and bolometers mounted on a satellite observatory orbiting the Earth. Spectral measurements identify the irradiance of the Sun by characterizing the Sun's
Solar Radiation and Climate Experiment
Solar_Radiation_and_Climate_Experiment
In astronomy, a spectral atlas is a collection of spectra of one or more objects, intended as a reference work for comparison with spectra of other objects
Spectral_atlas
Main-sequence star of spectral type O
Hertzsprung–Russell diagram Spectral type O B A F G K M L T Brown dwarfs White dwarfs Red dwarfs Subdwarfs Main sequence ("dwarfs") Subgiants Giants Red
O-type_main-sequence_star
Eruption of electromagnetic radiation
for solar flares uses the letters A, B, C, M, or X, according to the peak flux in watts per square metre (W/m2) of soft X-rays with wavelengths 0.1 to 0
Solar_flare
Chemical compound
crystal, similar to amethyst. YAB crystals are grown by the flux method with a modified molybdate flux system. They may enable diode-pumped visible-light lasers
Nd:YAB
Fluctuations in the energy spectrum of the microwave background
CMB spectral distortions are tiny departures of the average cosmic microwave background (CMB) frequency spectrum from the predictions given by a perfect
Cosmic microwave background spectral distortions
Cosmic_microwave_background_spectral_distortions
Property of photosensitive devices
could damage the cell. Quantum efficiency (QE) is the fraction of photon flux that contributes to the photocurrent in a photodetector or a pixel. Quantum
Quantum_efficiency
Measures fluctuations in the refractive index of air
sensible heat flux. Inner-scale scintillometers can also measure the dissipation rate of turbulent kinetic energy and the momentum flux. Transmissometer
Scintillometer
Solar power cell with multiple band gaps from different materials
5 spectral irradiance is given in unit of the photon flux per photon energy, [no. of photons/m2·s·eV], as shown in Figure 1. Figure 1. Photon flux per
Multi-junction_solar_cell
Property of light sources related to black-body radiation
frequencies much lower than the peak frequency of a black-body radiator, spectral power is inversely proportional to the fourth power of the wavelength.
Color_temperature
3-1000 micrometre spectral range.[citation needed] The code can handle spherical or plane-parallel atmospheres. It reads spectral lines in HITRAN or
FUTBOLIN
Brightness of a celestial object observed from the Earth
0}}}\right),} where Fx is the observed irradiance using spectral filter x, and Fx,0 is the reference flux (zero-point) for that photometric filter. Since an
Apparent_magnitude
Photometric measure
and falls within a given solid angle. The procedure for conversion from spectral radiance to luminance is standardized by the CIE and ISO. Brightness is
Luminance
Instrument for measuring solar irradiance
radiation flux density from a 180° field of view angle. A thermopile pyranometer thus usually measures from 300 to 2800 nm with a largely flat spectral sensitivity
Pyranometer
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SPECTRAL FLUX
SPECTRAL FLUX
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Bengali, Indian, Modern
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Bengali, Indian, Telugu
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Arabic, Bengali, Gujarati, Hindu, Indian, Kannada, Malayalam, Marathi, Muslim, Sindhi, Tamil, Telugu
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SPECTRAL FLUX
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