Results 21 to 30 of about 820,012 (137)

On the relationship between the velocity of E-region HF echoes and E B plasma drift [PDF]

, 2005
International audienceIn this study, velocities of E-region HF echoes observed by the Stokkseyri HF radar are compared with ExB plasma drifts in the F-region measured by the DMSP satellites.
D. W. Danskin, Koustov, A. V., J. D. Gorin, Makarevitch, R. A., Gorin, J. D., A. V. Koustov, R. A. Makarevitch, Danskin, D. W.   +7 more
core   +2 more sources

Effects of high-latitude atmospheric gravity wave disturbances on artificial HF radar backscatter [PDF]

, 2006
International audienceObservations of HF radar backscatter from artificial field-aligned irregularities in an ionosphere perturbed by travelling disturbances due to atmospheric gravity waves are presented.
Tim K. Yeoman (7583066), A. Senior, M. J. Kosch (7595327), I. W. McCrea, M. T. Rietveld (7594184), Rietveld, M. T., Senior, A., T. K. Yeoman, I. W. McCrea (7594871), M. T. Rietveld, Kosch, M. J., M. J. Kosch, A. Senior (3255282), McCrea, I. W., Yeoman, T. K.   +14 more
core   +2 more sources

LED lighting systems for smart buildings: a review

IET Smart Cities, Volume 2, Issue 3, Page 126-134, September 2020., 2020
This study presents a review of smart light‐emitting diode (LED) lighting systems applied to smart buildings. The study is focused on drivers, protocols, technologies, communication networks and applications. An extended overview of the methodologies used for LED lighting control in smart buildings is addressed.
Héctor F. Chinchero, J. Marcos Alonso, Hugo Ortiz T   +2 more
wiley   +1 more source

Nightside studies of coherent HF radar spectral width behaviour [PDF]

, 2002
A previous case study found a relationship between high spectral width measured by the CUTLASS Finland HF radar and elevated electron temperatures observed by the EISCAT and ESR incoherent scatter radars in the post-midnight sector of magnetic local time.
J. A. Davies, Davies, J.A., Eglitis, P., P. Eglitis (7605143), P. Eglitis, Woodfield, E.E., Lester, M., Lockwood, M., Lockwood, Mike, M. Lester, J. A. Davies (4412452), T. K. Yeoman (7601525), T. K. Yeoman, M. Lester (7589660), Davies, J. A., M. Lockwood, M. Lockwood (7612331), E. E. Woodfield (7590071), E. E. Woodfield, Yeoman, T. K., Yeoman, T.K., Woodfield, E. E.   +21 more
core   +2 more sources

Spread Sea Clutter Suppression in HF Hybrid Sky‐Surface Wave Radars Based on General Parameterized Time‐Frequency Analysis

International Journal of Antennas and Propagation, Volume 2020, Issue 1, 2020., 2020
In high‐frequency (HF) hybrid sky‐surface wave radar, the first‐order sea clutter broadening is severe under the action of ionospheric phase disturbance and bistatic angles. In this paper, a cascaded method is described to suppress the spread sea clutter.
Zhuo-qun Wang, Ya-jun Li, Jun-nan Shi, Peng-fei Wang, Ai-hua Liu, Xin-fan Xia, De-hong Chen, Qing Shen   +7 more
wiley   +1 more source

D region HF radar echoes associated with energetic particle precipitation and pulsating aurora [PDF]

, 2008
Milan et al. (2001) identified a class of narrow, slow-moving HF radar backscatter echoes which originate between altitudes of 80 and 100 km, the ionospheric D- and lower E-regions.
Milan, S.E., S. E. Milan, K. Hosokawa, Yamagishi, H., N. Sato, Lester, M., F. Honary, Hosokawa, K., Honary, F., Sato, N., M. Lester, H. Yamagishi   +11 more
core   +2 more sources

Stereo CUTLASS-a new capability for the SuperDARN HF radars [PDF]

, 2004
International audienceThe Super Dual Auroral Radar Network (SuperDARN), which consists of networks of HF radars surrounding the northern and southern poles, has proven to be an extremely successful experimental technique in a wide range of scientific ...
S. W. H. Cowley, Crooks, S. J., M. J. Parsons (7590314), Hamadyk, P., S. W. H. Cowley (7590302), Thornhill, J. D., P. J. Chapman, N. M. Wade (7590326), D. B. Payne (7590317), Chapman, P. J., J. A. Davies (4412452), E. C. Thomas, T. K. Yeoman, S. J. Crooks (7590305), Thomas, E. C., N. M. Wade, Yeoman, T. K., S. J. Crooks, D. B. Payne, R. J. Barnes, J. A. Davies, E. C. Thomas (7590320), Tim K. Yeoman (7583066), McWilliams, K. A., Barnes, R. J., Milan, S. E., K. A. McWilliams, R. J. Barnes (7590329), Lester, M., P. Hamadyk (7590308), M. J. Parsons, Steve E. Milan (7589666), Payne, D. B., Wade, N. M., M. Lester, M. Lester (7589660), P. J. Chapman (7590299), K. A. McWilliams (7590311), Davies, J. A., S. E. Milan, Cowley, S. W. H., J. D. Thornhill, J. D. Thornhill (7590323), Parsons, M. J., P. Hamadyk   +44 more
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Quantifying Errors in the Midpoint Transform Applied to Oblique Ionograms

Radio Science, Volume 61, Issue 7, July 2026.
Abstract It is important to specify the state of the ionosphere for Over‐the‐Horizon communications and surveillance. Both vertical and oblique ionograms provide valuable data to this end. Oblique ionograms can probe the ionosphere in locations where it would be impractical to build a vertical ionosonde, but their measurements are not straightforward ...
Joe Hughes, L. J. Nickisch, Sergey Fridman, Gregory Bullock, Shawn Kraut, Matt Hogan, Victoriya Forsythe   +6 more
wiley   +1 more source

Investigation of the relationship between optical auroral forms and HF radar E region backscatter [PDF]

, 2000
International audienceThe SuperDARN HF radars have been employed in the past to investigate the spectral characteristics of coherent backscatter from L-shell aligned features in the auroral E region.
Milan, S. E., N. Sato, Lester, M., H. Takizawa (7612496), Villain, J.-P., J. -p. Villain, Takizawa, H., M. Lester, N. Sato (7606136), Milan, S.E., S. E. Milan, Stephen E. Milan (7612220), J. P. Villain (7612424), J.-P. Villain, Mark Lester (6477935), Sato, N., H. Takizawa   +16 more
core   +2 more sources

Tracking Water Dynamics of a Temperate Forest Under Drought and Non‐Drought Conditions Using Active and Passive Microwave and Optical Remote Sensing

Journal of Geophysical Research: Biogeosciences, Volume 131, Issue 5, May 2026.
Abstract Water status, water dynamics, and ecohydrological resilience of a protected German beech forest during the 2018–2020 multi‐year drought are assessed using over six years of multi‐frequency remote sensing data, integrating active, passive, and optical sensors with varying canopy penetration depths, highlighting the importance of monitoring ...
Florian M. Hellwig, Anke Fluhrer, Clémence Dubois, Konstantin Schellenberg, David Chaparro, Markus Zehner, Anne Klosterhalfen, María Piles, Christiane Schmullius, Harald Kunstmann, Thomas Jagdhuber   +10 more
wiley   +1 more source