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The Doppler parameter, or Doppler broadening parameter, usually denoted as , is a parameter commonly used in astrophysics to characterize the width of observed spectral lines of astronomical objects. It is defined as
,
where is the one-dimensional velocity dispersion (Draine 2011, p. 58). Given this parameter, the velocity distribution of the line-emitting/absorbing atoms and ions proximated by a Gaussian can be rewritten as
,
where is the probability of the velocity along the line of sight being in the interval .
The line width is also often specified in terms of the FWHM (full width at half maximum), which is
The Dopplerparameter, or Doppler broadening parameter, usually denoted as b {\displaystyle b} , is a parameter commonly used in astrophysics to characterize...
numerical integrals for most values of the parameters. For cosmological redshifts of z < 0.01 additional Doppler redshifts and blueshifts due to the peculiar...
Satellite System (NNSS). Doppler data was also available from the numerous sites established by GEOCEIVERS during 1971 and 1972. Doppler data was the primary...
In physics, relativistic beaming (also known as Doppler beaming, Doppler boosting, or the headlight effect) is the process by which relativistic effects...
information content in measurements of range, bearing and Doppler becomes very low (all these parameters tend to zero, regardless of the location of the target...
In medicine, Esophageal Doppler or Oesophageal Doppler uses a small ultrasound probe inserted into the esophagus through the nose or mouth to measure blood...
correct the Doppler spectrum, so that the retrieved microphysical parameters can be improved and the uncertainties decreased. The skewness parameter of the...
Doppler spectroscopy (also known as the radial-velocity method, or colloquially, the wobble method) is an indirect method for finding extrasolar planets...
techniques have evolved to do this. Generally they take advantage of the Doppler effect caused by the rotation or other motion of the object and by the...
bat approaches a target, its outgoing sounds return as echoes, which are Doppler shifted upward in frequency. In certain species of bats, which produce...
An acoustic doppler current profiler (ADCP) is a hydroacoustic current meter similar to a sonar, used to measure water current velocities over a depth...
is called the Friedmann–Lemaître–Robertson–Walker (FLRW) metric. The parameter k discussed below takes the value 0, 1, −1, or the Gaussian curvature...
single-path Rayleigh fading channel with a maximum Doppler shift of 10 Hz and 100 Hz. These Doppler shifts correspond to velocities of about 6 km/h (4 mph)...
Sigma, the heroes X and Zero must battle a Reploid scientist named Dr. Doppler and his utopia of Maverick followers. Mega Man X3 follows the tradition...
Numerical manipulation of Dopplerparameters obtain during routine Echocardiography has been extensively utilized to non-invasively estimate intra-cardiac...
lines we can observe on a spectral profile will be shifted due to Doppler effect. Doppler tomography aims at converting the information contained in spectral...
electrically revolving a pair of transmitters. The cyclic doppler blue shift, and corresponding doppler red shift, as a transmitter closes on and recedes from...
method uses ultrasound and the Doppler effect to measure cardiac output. The blood velocity through the heart causes a Doppler shift in the frequency of the...
1900 he built a device for measuring the Doppler shift of spectra. He pioneered the use of optical Doppler shift to measure the rotational rates of distant...
is sometimes known as Doppler auscultation. The Doppler fetal monitor is commonly referred to simply as a Doppler or fetal Doppler and provides information...
Photon Doppler velocimetry (PDV) is a one-dimensional Fourier transform analysis of a heterodyne laser interferometry, used in the shock physics community...
functions, whose parameters are the line position, maximum height and half-width. Actual line shapes are determined principally by Doppler, collision and...
3905 Doppler, provisional designation 1984 QO, is a stony asteroid and binary system from the middle region of the asteroid belt, approximately 8 kilometers...
changes of the reflected light) and coherent detection (best for measuring Doppler shifts, or changes in the phase of the reflected light). Coherent systems...
Index (RAI) is a numeric parameter used to assess for cardiac shunt defects. It is calculated from the standard transthoracic Doppler echocardiogram measurements...
galaxies showed a red shift in their spectral lines presumably caused by the Doppler effect, thus indicating that these galaxies were moving away from the Earth...
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