Results 241 to 250 of about 24,293 (260)

Cryo-EM structures of a protein pore reveal a cluster of cholesterol molecules and diverse roles of membrane lipids. [PDF]

Nat Commun
Šolinc G, Srnko M, Merzel F, Crnković A, Kozorog M, Podobnik M, Anderluh G.   +6 more
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Surface darkening by abundant and diverse algae on an Antarctic ice cap. [PDF]

Nat Commun
Thomson AI, Gray A, Colesie C, Thomas N, Moulton H, Convey P, Smith AG, Fretwell P, Peck L, Davey MP.   +9 more
europepmc   +1 more source

No Pinching: Topological Constraints on Polar Cap Patch Formation

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Structural insights into pre-pore intermediates of alpha-hemolysin in the lipidic environment. [PDF]

Nat Commun
Chatterjee A, Roy A, Satheesh T, Das PP, Mondal B, Kishore P, Ganji M, Dutta S.   +7 more
europepmc   +1 more source

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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
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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
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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
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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, Q.-H. Zhang
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
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Airglow Patches in the Polar Cap Region: A Review

Space Science Reviews, 2019
Polar cap airglow patches have been known as regions of enhanced 630.0 nm airglow detected by ground-based all-sky imagers at the polar cap latitudes well inside the main auroral oval. Although they were already recognized almost four decades ago as counterparts of polar cap (plasma density) patches, such airglow observations had not been utilized ...
Keisuke Hosokawa, Ying Zou, Yukitoshi Nishimura   +2 more
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