Results 201 to 210 of about 858,402 (225)

WakeMeta: Physics‐Guided Graph Meta‐Adaptation for Cross‐Farm Probabilistic Wind Power Forecasting

Wind Energy, Volume 29, Issue 12, December 2026.
ABSTRACT Short‐term wind power forecasting is essential for reliable grid operation, yet newly commissioned wind farms often provide only limited supervisory control and data acquisition (SCADA) histories for model adaptation. Existing cross‐farm methods face two related limitations: Data‐driven models must relearn site‐specific interturbine ...
YanCheng Yang, YuChen Zhang, Rajermani Thinakaran   +2 more
wiley   +1 more source

Structure and Propagation of Mesoscale Cyclonic Eddies in the Brazil–Malvinas Confluence

International Journal of Climatology, Volume 46, Issue 13, 15 November 2026.
Between 1993 and 2022, 1386 cyclonic eddies were identified in the Brazil–Malvinas Confluence, one of the most energetic regions of the South Atlantic. While most eddies dissipated locally, a smaller number of individuals, more energetic, and longer lived propagated predominantly south‐westward and north‐eastward, driven by topographic constraints and ...
Rafaella Oliveira Santos, Ilson Carlos Almeida da Silveira, Fabricio Sanguinetti Cruz de Oliveira   +2 more
wiley   +1 more source

A Geometric Multigrid Preconditioner for Discontinuous Galerkin Shifted Boundary Method

International Journal for Numerical Methods in Engineering, Volume 127, Issue 21, 15 November 2026.
ABSTRACT I introduce a geometric multigrid preconditioner for the Shifted Boundary Method (SBM) designed to solve PDEs on complex geometries. While the SBM simplifies mesh generation by using a nonconforming background grid, it often results in nonsymmetric linear systems, a complete analysis of which is missing from the literature, especially with ...
Michał Wichrowski
wiley   +1 more source

Direct Observations of the Evolution of Polar Cap Ionization Patches

Science, 2013
Patchy Polar Cap Patches of enhanced density plasma in the polar ionosphere (or polar cap patches) disturb radio communications and satellite positioning at high latitudes during magnetospheric storms. Using data from Global Positioning System satellites and a high-frequency radar network,
Qing-He, Zhang, Bei-Chen, Zhang, Michael, Lockwood, Hong-Qiao, Hu, Jøran, Moen, J Michael, Ruohoniemi, Evan G, Thomas, Shun-Rong, Zhang, Hui-Gen, Yang, Rui-Yuan, Liu, Kathryn A, McWilliams, Joseph B H, Baker   +11 more
openaire   +3 more sources

Occurrence Distribution of Polar Cap Patches: Dependences on UT, Season and Hemisphere [PDF]

Journal of Geophysical Research: Space Physics, 2021
Polar cap patches are islands of enhanced electron density in the polar cap F region ionosphere, which sometimes affect the propagation of trans-ionospheric radio waves.
Keisuke Hosokawa, Yusuke Ebihara, Akira Kadokura   +2 more
exaly   +2 more sources

The Role of Neutral Winds in Polar Cap Patch Instability Growth

Journal of Geophysical Research: Space Physics
Abstract Polar cap patches are regions of dense plasma in the polar cap that convect from noon to midnight, moving against the neutral gas background. The gradient drift instability (GDI) destabilizes the edge of these patches as they convect, yet the rate of this destabilization is not well known due to the scarcity of coincident ...
Bryce F. Halter, David Malaspina, Patrick A. Roddy, Naomi Maruyama, Laila Andersson   +4 more
openaire   +2 more sources

Some of the next articles are maybe not open access.

Related searches:

Effect of polar cap patches on the polar thermosphere

Journal of Geophysical Research: Space Physics, 1995
Polar cap patches are regions of enhanced ionization that appear when the interplanetary magnetic field is southward. They are created either in the dayside cusp or equatorward of the cusp in the sunlit hemisphere. Once formed, they convect in an antisunward direction across the dark polar cap at speeds of 100 m/s to about 2 km/s.
Ti‐Ze Ma, R. W. Schunk
openaire   +1 more source

On the Creation, Depletion, and End of Life of Polar Cap Patches

2022
Ionospheric convection patterns from the Super Dual Auroral Radar Network are used to determine the trajectories, transit times and decay rates of three polar cap patches from their creation in the dayside polar cap ionosphere to their end of life on the nightside.
Nina Kristine Eriksen, Dag Lorentzen, Lisa Jane Baddeley, Kjellmar Oksavik, Keisuke Hosokawa, Kazuo Shiokawa, Emma Christine Bland, Larry J. Paxton, Yongliang Zhang, Kathryn McWilliam, Tim K. Yeoman   +10 more
openaire   +1 more source

Can Throat Auroras Create Polar Cap Patches？

2023
Throat auroras and polar cap patches are common phenomena in the polar ionosphere. An observation campaign was organized, with all-sky imagers at Yellow River Station in Ny-Ålesund in Svalbard, the EISCAT Svalbard Radar, and coordinated low-altitude spacecraft observations.
Duan Zhang, Qinghe Zhang, Kjellmar Oksavik, Tong Xu, Zanyang Xing, Larry Lyons, Desheng Han, Hongbo Zhang, Yuzhang Ma, Zejun Hu, Jianjun Liu, Yong Wang, Xiangyu Wang   +12 more
openaire   +1 more source

Velocity fluctuations associated with polar cap patches

Radio Science, 1996
The digital ionosonde technique has been used to measure the convection in the vicinity of polar cap patches. Two types of velocity fluctuations were seen: (1) parallel fluctuations which are a slowing down and speeding up of the convection without a change in direction, and (2) perpendicular fluctuations which are perpendicular to the average ...
J. W. MacDougall, I. F. Grant, A. Hamza
openaire   +1 more source