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Showing 1 to 20 of 71 for “"polarimetry"”.
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Robotic Polarimetry of Blazars
… of standard stars. The Ringo2 and Ringo3 optical polarimetry and photometry of a sample of 20 gamma-ray bright blazars were combined with Fermi gamma-ray space telescope data and were used to explore possible correlations and thus probe the emission sites in the jet. We found that optical and …
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Polarimetry Of Random Fields
… average quantities are accessible. The study of polarimetry is concerned with both the description of electromagnetic fields and the characterization of media a field has interacted with. The polarimetric information is conventionally presented in terms of second order field correlations which …
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Polarimetry of magnetic cataclysmic variables
The design and construction of an astronomical polarimeter is described and an evaluation made of its performance. Extensive observations of cataclysmic variables with emphasis on the AM Her and DQ Her classes are then presented. After consideration of the basic principles involved in the …
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Soil parameter retrieval under vegetation cover using SAR polarimetry
Soil conditions under vegetation cover and their spatial and temporal variations from point to catchment scale are crucial for understanding hydrological processes within the vadose zone, for managing irrigation and consequently maximizing yield by precision farming. Soil moisture and soil …
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Extreme Ultraviolet Polarimetry with Laser-Generated High-Order Harmonics
We developed an extreme ultraviolet (EUV) polarimeter, which employs laser-generated high-order harmonics as the light source. This relatively high-flux directional EUV source has available wavelengths between 8 nm and 62 nm and easily rotatable linear polarization. The polarimeter will aid …
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Extreme ultraviolet polarization optics for polarimetry of structured high harmonics
… optics in EUV are extended with full-beam polarimetry of harmonic light generated with structured illumination. Characterization of the fundamental light’s structured illumination and polarization profile combined with similar characterization of the harmonics can reveal insights into the …
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Experimental study of non-resolved active polarimetry for space surveillance
… potential utility of a technique known as active polarimetry, by which a laser radar would illuminate a space object with polarized light and measure the polarization state of the reflected light. A debris fragment's polarimetric signature can help identify its material, shape, and orientation, …
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An analysis of cryovolcano plumes on Enceladus by light scattering and polarimetry
Enceladus, the sixth largest moon of Saturn, is known to be a geologically active icy body. Observations by NASA’s Cassini spacecraft show that Enceladus has cryovolcanoes on its south pole as well as a global subsurface ocean hidden beneath its frozen crust. Photographs from Cassini during flybys …
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High cadence optical polarimetry for time domain astronomy on the Liverpool Telescope
Gamma-ray bursts are the most violent of known astrophysical events, with up to 10^53 ergs of energy released on the order of seconds. These extreme explosions, first observed in 1960s, form a fast moving field of research within astrophysics which relies on multi-wavelength observations of these …
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Mass Assembly in Protoplanetary Disks: Polarimetry as a Probe of Dust Growth and Accretion
Submission original under an indefinite embargo labeled 'Open Access'. The submission was exported from vireo on 2023-04-12 without embargo terms
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Polarimetry measurements of current density profile and fluctuation changes during lower hybrid experiments on Alcator C-Mod
… power and phase scans have been carried out. The Polarimetry observations confirm the off-axis current drive, and strongly decreasing driven current when the density exceeds a limit of about 1.Ox 102 0/m3 . They also indicate that the driven current is closer to the plasma edge for Ip ~820 kA than …
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The Scattering of H-alpha Emission Associated with the Rosette Nebula in the Monoceros Region Studied Using Polarimetry
Polarimetric CCD images of HII regions were obtained using a rotating polarizer device designed, built, and used in conjunction with the Spectral Line Imaging Camera (SLIC) at Virginia Tech's Martin Observatory in Giles County, Virginia. The SLIC uses a narrow bandpass interference filter coupled …
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Utilizing Parity Violating Electron Scattering As a Probe to Measure the Neutron Radius of 208-pb
… a high priority). The results of the Møller polarimetry measurements taken over the PREX-II experiment averaged 89.7% ± 0.1% (stat) ± 0.89% (syst) while results from the CREX experiment were in remarkable agreement with the Compton Polarimetry results. The PREX-II experimental results …
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A fiber optic polarimeter for use in chemical analysis
Polarimetry, as applied to chemical analysis, deals with the determination of the extent and direction that an optically active chemical species will rotate incident linearly polarized light. Although well developed for physical sensing, the technique of fiber optic polarimetry for chemical sensing …
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Measurement of Magnetic Fields From Linear Polarization of Dust Emission
Other applications of polarimetry at millimeter wavelengths include imaging of radio galaxies (for e.g. Cygnus A, M87), monitoring the time variability of polarized SiO maser emission (RLeo, Orion IRc2) and studying the linear polarization of quasars.
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Multifaceted Understanding of Accreting Neutron stars and their Environments
… the mysteries of these objects, with X-ray polarimetry being a recent development providing two additional observables. In my thesis, I showcase a multifaceted approach to studying accreting neutron star binaries, employing X-ray timing, spectroscopic, and polarimetry with many X-ray …
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TIME RESOLVED PROBING OF MAGNETO-ELASTIC EXCITATIONS IN MAGNETIC MATERIALS
… spectroscopies (time-resolved reflectivity and polarimetry). Via sub-picosecond optical pulses, acoustic and magnetic transients are impulsively generated: their intertwined evolution and decay are monitored via time-resolved optical probing. In a first experiment, a Ni thin film was …
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