Results 21 to 30 of about 34,527 (227)

Wuhan Ionospheric Oblique Backscattering Sounding System and Its Applications—A Review

open access: yesSensors, 2017
For decades, high-frequency (HF) radar has played an important role in sensing the Earth’s environment. Advances in radar technology are providing opportunities to significantly improve the performance of HF radar, and to introduce more applications ...
Shuzhu Shi   +4 more
doaj   +1 more source

History of the Super Dual Auroral Radar Network (SuperDARN)-I: pre-SuperDARN developments in high frequency radar technology for ionospheric research and selected scientific results [PDF]

open access: yesHistory of Geo- and Space Sciences, 2021
Part I of this history describes the motivations for developing radars in the high frequency (HF) band to study plasma density irregularities in the F region of the auroral zone and polar cap ionospheres.
R. A. Greenwald
doaj   +1 more source

Remote sensing of the surface wind field over the coastal ocean via direct calibration of HF radar backscatter power [PDF]

open access: yes, 2016
Author Posting. © American Meteorological Society, 2016. This article is posted here by permission of American Meteorological Society for personal use, not for redistribution.
Kirincich, Anthony R.
core   +1 more source

Noncontact assessment for fatigue based on heart rate variability using IR-UWB radar

open access: yesScientific Reports, 2022
Physical fatigue can be assessed using heart rate variability (HRV). We measured HRV at rest and in a fatigued state using impulse-radio ultra wideband (IR-UWB) radar in a noncontact fashion and compared the measurements with those obtained using ...
Sarfaraz Ahmed   +5 more
doaj   +1 more source

HF Radar Activity in European Coastal Seas: Next Steps toward a Pan-European HF Radar Network [PDF]

open access: yesFrontiers in Marine Science, 2017
High Frequency Radar (HFR) is a land-based remote sensing instrument offering a unique insight to coastal ocean variability, by providing synoptic, high frequency and high resolution data at the ocean atmosphere interface. HFRs have become invaluable tools in the field of operational oceanography for measuring surface currents, waves and winds, with ...
Rubio, Anna   +17 more
openaire   +6 more sources

Space weather challenges of the polar cap ionosphere [PDF]

open access: yes, 2016
This paper presents research on polar cap ionosphere space weather phenomena conducted during the European Cooperation in Science and Technology (COST) action ES0803 from 2008 to 2012.
Alfonsi, Lucilla   +5 more
core   +4 more sources

A comparison of satellite scintillation measurements with HF radar backscatter characteristics [PDF]

open access: yesAnnales Geophysicae, 2005
We examine the correspondence between high latitude ionospheric scintillation measurements made at 250MHz with the occurrence of 10MHz HF coherent radar backscatter, on 13 and 14 December 2002.
S. E. Milan   +3 more
doaj   +1 more source

Mapping Wind Directions with HF Radar

open access: yesOceanography, 1997
BESIDES THE MEASUREMENT of ocean surface currents, high-frequency (HF) radar has also been demonstrated to be effective at measuring the wind direction at scales on the order of one to several kilometers and over areas of millions of square kilometers in the case of sky-wave HF radars (Georges et al.
Graber, Hans C.   +3 more
openaire   +2 more sources

Spatiotemporal evolution of radio wave pump-induced ionospheric phenomena near the fourth electron gyroharmonic [PDF]

open access: yes, 2007
On 12 November 2001, the European Incoherent Scatter (EISCAT) high-frequency (HF) radio wave transmitter facility, operating in O-mode at 5.423 MHz with 550 MW effective radiated power, produced artificial optical rings which appeared immediately at ...
Ashrafi, M.   +3 more
core   +1 more source

Validation of HF Radar Measurements [PDF]

open access: yesOceanography, 1997
made? H F RADARS ARE A UNIQUE and powerful tool for measuring surface currents. They provide an unpa ra l l e l ed window into the spat ial var ia t ions of near-surface currents. But oceanographers who are more accus tomed to measur ing currents with instruments that actually get wet may reasonably ask how accurate can such remote measurements be made?
Rick Chapman, Hans Graber
openaire   +1 more source

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