First observation of thermospheric neutral wind at Chinese Yellow River Station in Ny-Ålesund, Svalbard

Zhang, Hong; Ai, Yong; Zhang, Yange; Hu, Guoyuan

doi:10.1007/s11434-012-5626-9

Cited by 7 publications

(4 citation statements)

References 18 publications

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“…Auroral ASI images at Yellow River Station (YRS) are provided by the Polar Research Institute of China, Shanghai, China, and data acquisition and processing are supported by the Chinese Antarctic Research Expedition (CHINARE). The ASI image data used in this research can be found on Zenodo (Wang, 2024). The relevant code with detailed instructions is available at https://github.com/Dabai1205/AuroSS.…”

Section: Data Availability Statementmentioning

confidence: 99%

Automatically Sketching Auroral Skeleton Structure in All‐Sky Image for Measuring Aurora Arcs

Wang,

Bai,

Zhang

et al. 2024

JGR Space Physics

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The auroral arc is the typical track of the interaction between the solar wind and the Earth's magnetosphere. A sketch of skeletons for arc‐like aurora is usually used to describe auroral structures, such as vortex, fold and curl structures, etc. With artificial intelligence technologies, sketching auroral skeleton structure (AuroSS) in all‐sky images enables automatic detection and measurement of aurora arcs in very large amounts of ground‐based auroral observation data. The skeleton is a highly characterizing topological structure that has been extensively studied in the field of computer vision. However, AuroSS is not the medial axis of auroral shapes and a large number of accurate AuroSS annotations are not available. It is difficult to detect AuroSS by using an unsupervised or fully‐supervised method. In this paper, we formulate the automatic AuroSS extraction to learn a mapping from an all‐sky auroral image to a ridge style AuroSS. Without accurate AuroSS annotations, emission ridge and coarse localization of aurora are incorporated to generate pseudo‐labels of AuroSS. A series of functional weakly supervised models are trained and cascaded to achieve AuroSS detection. Experimental results on auroral images obtained from all‐sky imagers at Yellow River Station (YRS) show that the detected AuroSS is consistent with that of human visual perception. Based on the obtained AuroSS, the orientations and lengths of auroral arcs can be estimated automatically. By browsing the temporal variation in arc orientation from dusk to dawn, we can acquire synoptic observations of auroral activities at YRS.

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Section: Data Availability Statementmentioning

confidence: 99%

Automatically Sketching Auroral Skeleton Structure in All‐Sky Image for Measuring Aurora Arcs

Wang,

Bai,

Zhang

et al. 2024

JGR Space Physics

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“…3 h) [20]. Interference fringes of 557.7 and 630.0 nm were obtained through different bandpass filters, and we conducted observations from November 2010 onward during the polar night of each year.…”

Section: Equipment and Observationsmentioning

confidence: 99%

Observations of thermospheric vector wind over Yellow River Station during auroral substorm events

Liu

Zhang

et al. 2014

Chin. Sci. Bull.

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Strong disturbances associated with auroral substorms originate from the ionosphere-magnetosphere owing to the effects of the solar wind, and the wind field in the ionosphere is related to such substorm activity. Here, we describe the analysis of four auroral substorm events, for which we employed an all-sky Fabry-Perot interferometer to observe the two-dimensional horizontal wind field and combined the results with data from an all-sky charge-coupled device imager, a fluxgate magnetometer installed at Yellow River Station, and the Super Dual Auroral Radar Network. The results demonstrate that, during auroral substorms, the vector wind field is related closely to variations in the ion drift and geomagnetic field. Moreover, we observed a changing wind field of approximately 300 m/s in response to variations in the electric and magnetic fields (likely caused by ion drag) and a disturbance of about 200 m/s that we attribute to the interaction of Joule heating and ion drag.

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“…The relationship between root diameter and root reinforced soil. The diameter of root has greater impact on its tensile strength, which is generally believed that the tensile strength of root and root diameter has relationship of a power function or exponential function [4]. According to research, small roots make greater contribution to the improvement of the soil shear strength, which is that the fine roots not only has a higher tensile strength, but also has a larger surface area than the coarse roots of the same RAR (Root of Area Ratio denoted to RAR: coarse root area ratio), therefore, the larger friction between roots and soil and the stronger ability to resist pull off.…”

Section: The Mechanisms Of Soil-reinforcement By Plant Rootsmentioning

confidence: 99%

The Affecting Factors of Soil-Reinforcement by Plant Roots

Xia

Xiao

Fang

et al. 2012

AMR

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Now, with the large-scale of various projects constructed, a lot of the original vegetation were destroyed and formed a large area of bare slope. The existence of slopes increased the occurrent intensity of soil erosion, landslides and debris flow, and also caused local ecological disasters of the deterioration of the microclimate and the destruction of the biological chain. Based on this situation, this article discussed the reinforced soil reinforcement of shallow fine roots and deep rough roots, and generalized comprehensively the root factors on the impact of the reinforced soil, and explored the lack of research and development trends of vegetation slope protection.

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First observation of thermospheric neutral wind at Chinese Yellow River Station in Ny-Ålesund, Svalbard

Cited by 7 publications

References 18 publications

Automatically Sketching Auroral Skeleton Structure in All‐Sky Image for Measuring Aurora Arcs

Automatically Sketching Auroral Skeleton Structure in All‐Sky Image for Measuring Aurora Arcs

Observations of thermospheric vector wind over Yellow River Station during auroral substorm events

The Affecting Factors of Soil-Reinforcement by Plant Roots

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