Results 81 to 90 of about 16,272 (256)

A novel technique for wide-field polarimetry with a radiotelescope array [PDF]

open access: yes, 2005
We report the use of the Australia Telescope Compact Array (ATCA) to conduct polarimetric observations of the sky at 5 GHz. The ATCA is normally operated as an interferometer array, but these observations were conducted in a split array mode in which the
Carretti, E.   +2 more
core   +3 more sources

Aerosol‐Cloud Interactions: Overcoming a Barrier to Projecting Near‐Term Climate Evolution and Risk

open access: yesAGU Advances, Volume 7, Issue 1, February 2026.
Abstract Aerosol‐cloud interactions (ACI) are a major source of uncertainty in climate science, critically affecting our ability to project near‐term climate evolution and assess societal risks. These interactions influence effective radiative forcing, cloud dynamics, and precipitation patterns, yet remain insufficiently constrained due to limitations ...
Ulas Im   +40 more
wiley   +1 more source

An integrated approach to monitoring the calibration stability of operational dual-polarization radars [PDF]

open access: yesAtmospheric Measurement Techniques, 2016
The stability of weather radar calibration is a mandatory aspect for quantitative applications, such as rainfall estimation, short-term weather prediction and initialization of numerical atmospheric and hydrological models. Over the years, calibration
M. Vaccarono   +5 more
doaj   +1 more source

Albedo heterogeneity on the surface of (1943) Anteros [PDF]

open access: yes, 2009
We have investigated the effect of rotation on the polarization of scattered light for the near-Earth asteroid (1943) Anteros using the Dual Beam Imaging Polarimeter on the University of Hawaii's 2.2 m telescope.
Akimov   +23 more
core   +1 more source

Investigating the Microphysical Characteristics and Environmental Influences of Warm‐Rain Precipitation in Fuzhou Region of China

open access: yesEarth and Space Science, Volume 13, Issue 2, February 2026.
Abstract Microphysical characteristics of warm‐rain precipitation that occurred in Fuzhou region during warm seasons of 2022 and 2023 have been investigated by using polarimetric radar data. Results of a modified warm‐rain identification algorithm indicate positive ZDR variation in the liquid layer should be added as a criterion to prevent events ...
Guan Xiaojun   +8 more
wiley   +1 more source

Polarimetric Calibration for Ground-based Synthetic Aperture Radar based on Point Target Approach

open access: yesJurnal Elkomika
ABSTRAK Kalibrasi polarimetri (PolCal) dari citra radar aperture sintetis berbasis darat (GB SAR) sangat penting dalam aplikasi analisis spasial empiris.
NURUL CHASANAH   +5 more
doaj   +1 more source

First M87 Event Horizon Telescope Results. VII. Polarization of the Ring

open access: yesThe Astrophysical Journal Letters, 2021
In 2017 April, the Event Horizon Telescope (EHT) observed the near-horizon region around the supermassive black hole at the core of the M87 galaxy. These 1.3 mm wavelength observations revealed a compact asymmetric ring-like source morphology.
The Event Horizon Telescope Collaboration   +240 more
doaj   +1 more source

Performance of the Gemini Planet Imager Non-Redundant Mask and spectroscopy of two close-separation binaries HR 2690 and HD 142527

open access: yes, 2019
The Gemini Planet Imager (GPI) contains a 10-hole non-redundant mask (NRM), enabling interferometric resolution in complement to its coronagraphic capabilities.
Ammons, S. Mark   +53 more
core   +3 more sources

High-resolution polarimetry of Parsamian 21: revealing the structure of an edge-on FU Ori disc [PDF]

open access: yes, 2007
We present the first high spatial resolution near-infrared direct and polarimetric observations of Parsamian 21, obtained with the VLT/NACO instrument. We complemented these measurements with archival infrared observations, such as HST/WFPC2 imaging, HST/
A. Juhász   +73 more
core   +2 more sources

Characterizing trade‐wind shallow convection regimes in the open sea with a synergy of ship‐based vertical profiling observations

open access: yesQuarterly Journal of the Royal Meteorological Society, Volume 152, Issue 774, January 2026 Part A.
We use active remote sensing from a ship during the EUREC4$$ {\mathrm{EUREC}}^4 $$A campaign to characterize the environment before, during, and after precipitation in shallow convection. (1) Shallow clouds barely precipitate (only virga). Congestus clouds generate precipitation, occurring less often in the afternoon but with higher cloud fractions. (2)
Claudia Acquistapace   +5 more
wiley   +1 more source

Home - About - Disclaimer - Privacy