Results 21 to 30 of about 132,782,286 (257)
Remote Sensing, 2022 The evaporation duct (ED) is generated by the evaporation of seawater and can be an influential factor of electromagnetic (EM)-wave propagation. Rainfall also affects atmospheric factors and EM-wave propagation.
Fan Yang +5 more
doaj +1 more source
Impacts of Auroral Precipitation on HF Propagation: A Hypothetical Over‐the‐Horizon Radar Case Study
Space Weather, 2021 Over‐the‐horizon radar (OTHR) systems operating in the high‐frequency (HF) band (3–30 MHz) are unique in their ability to detect targets at extreme ranges, offering cost‐effective large‐area surveillance. Due to their reliance on the reflective nature of
Joshua J. Ruck, David R. Themens
doaj +1 more source
First Sagittarius A* Event Horizon Telescope Results. II. EHT and Multiwavelength Observations, Data Processing, and Calibration [PDF]
, 2022 We present Event Horizon Telescope (EHT) 1.3 mm measurements of the radio source located at the position of the supermassive black hole Sagittarius A* (Sgr A*), collected during the 2017 April 5-11 campaign.
Event Horizon Telescope Collaboration +1 more
core +1 more source
HORIZON-OPTIMIZED WEIGHTS FOR FORECAST COMBINATION WITH CROSS-LEARNING
, 2021 Recent empirical results show that forecast combinations and cross-learning schemes are winning approaches in the time series field. Although many competition-winning combination methods - with cross-learning or not - use static weights along the ...
Celso F. Araujo F. (12735685) +3 more
core +1 more source
Cumulative total relationship scores over the 28-day horizon.
, 2022 Cumulative total relationship scores over the 28-day horizon.
Tipaluck Krityakierne (12666825) +2 more
core +1 more source
Two‐dimensional transmit arrays for polar over‐the‐horizon radar
IET Radar, Sonar & Navigation, 2021 Two‐dimensional (2‐D) transmit arrays offer many advantages over traditional over‐the‐horizon radar (OTHR) arrays, including the capability to steer and mitigate auroral clutter, a clutter type prevalent in polar operation, in all azimuth and elevation ...
Simon Henault, Ryan J. Riddolls
doaj +1 more source
First M87 Event Horizon Telescope Results. IX. Detection of Near-horizon Circular Polarization [PDF]
, 2023 Event Horizon Telescope (EHT) observations have revealed a bright ring of emission around the supermassive black hole at the center of the M87 galaxy. EHT images in linear polarization have further identified a coherent spiral pattern around the black ...
The Event Horizon Telescope Collaboration
core +1 more source
Journal of Marine Science and Engineering, 2023 This paper represents observations on detection of Very High Frequency (VHF) anomalous propagation over the area of the Adriatic Sea. During the research campaign, a Software Defined Radio (SDR) Automatic Identification System (AIS) receiver was employed
Sanjin Valčić, David Brčić
doaj +1 more source
The Event Horizon General Relativistic Magnetohydrodynamic Code Comparison Project
, 2019 Supplementary materials for "The Event Horizon General Relativistic Magnetohydrodynamic Code Comparison Project", ApJS (2019)
Porth, Oliver +1 more
core +2 more sources
Broadband multi-wavelength properties of M87 during the 2017 Event Horizon Telescope campaign
, 2021 In 2017, the Event Horizon Telescope (EHT) Collaboration succeeded in capturing the first direct image of the center of the M87 galaxy. The asymmetric ring morphology and size are consistent with theoretical expectations for a weakly accreting ...
The Event Horizon Telescope Collaboration
core +1 more source