Advances in Astronomy最新文献_第9页

Effect of Ap-Index of Geomagnetic Activity on S&P 500 Stock Market Return 地磁活动ap指数对标普500股票市场收益的影响

IF 1.4 4区物理与天体物理

Advances in Astronomy Pub Date : 2019-07-14 DOI: 10.1155/2019/2748062

Lifang Peng, Ning Li, Jing-cai Pan

引用次数: 1

Single and Multiwavelength Detection of Coronal Dimming and Coronal Wave Using Faster R-CNN 基于更快R-CNN的单波长和多波长日冕调光和日冕波检测

IF 1.4 4区物理与天体物理

Advances in Astronomy Pub Date : 2019-07-08 DOI: 10.1155/2019/7821025

Zong-You Xie, Chunyan Ji

引用次数: 3

Recent Advances in Lunar Exploration Using Radar and Microwave Techniques 利用雷达和微波技术探月的最新进展

IF 1.4 4区物理与天体物理

Advances in Astronomy Pub Date : 2019-07-07 DOI: 10.1155/2019/4794258

Jing Li, Z. Meng, A. Gusev

引用次数: 0

Structural Analysis of Lunar Regolith from LPR CH-2 Data Based on Adaptive f-x E MD: LPR Data Processed by Adaptive f-x EMD 基于自适应f-x E MD的LPR CH-2数据月球风化层结构分析：自适应f-x EMD处理的LPR数据

IF 1.4 4区物理与天体物理

Advances in Astronomy Pub Date : 2019-07-01 DOI: 10.1155/2019/1528410

Bin Hu, Deli Wang, Ling Zhang, Z. Zeng

{"title":"Structural Analysis of Lunar Regolith from LPR CH-2 Data Based on Adaptive f-x E MD: LPR Data Processed by Adaptive f-x EMD","authors":"Bin Hu, Deli Wang, Ling Zhang, Z. Zeng","doi":"10.1155/2019/1528410","DOIUrl":"https://doi.org/10.1155/2019/1528410","url":null,"abstract":"The Lunar Penetrating Radar (LPR) is one of the important scientific payloads in China’s Chang’E-3 (CE-3) to image within 100 m below the lunar surface. The acquired LPR data is significant for the research of lunar geological structure. Based on the sedimentary mechanism of lunar regolith, the regolith contains many rocks with different sizes. These local anomalies appear as diffraction in LPR data, which reduces the data quality and limits the structural analysis of lunar regolith. According to the kinematics characteristics of rock caused diffraction, we transform these problems to a problem of steep dip decreasing. To reach this goal, we adopt a data preprocessing workflow to improve the quality of the radar image, firstly. Then, a dip filter based on adaptive f-x empirical mode decomposition (EMD) is proposed to extract the rocks in the regolith and the corresponding removed IMF map indicates the degree of rock enrichment and highlights regolith-basement interface. Both simulation and LPR CH-2 data present a great performance. Finally, according to the processed result, we locate the position of each rock and highlight the contact interface of regolith and the basement rock.","PeriodicalId":48962,"journal":{"name":"Advances in Astronomy","volume":" ","pages":""},"PeriodicalIF":1.4,"publicationDate":"2019-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1155/2019/1528410","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44317669","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 2

Several Geological Issues of Schrödinger Basin Exposed by CE-2 CELMS Data CE-2 CELMS资料揭示薛定谔盆地的几个地质问题

IF 1.4 4区物理与天体物理

Advances in Astronomy Pub Date : 2019-07-01 DOI: 10.1155/2019/3926082

Z. Meng, H. H. Wang, Y. C. Zheng, Y. Z. Wang, H. Miyamoto, Z. C. Cai, J. Ping, Y. Z. Zhu

引用次数: 6

Lunar Radiometric Measurement Based on Observing China Chang’E-3 Lander with VLBI—First Insight 基于VLBI观测中国嫦娥三号着陆器的月球辐射测量——首次发现

IF 1.4 4区物理与天体物理

Advances in Astronomy Pub Date : 2019-06-02 DOI: 10.1155/2019/7018620

Song-tao Han, Zhongkai Zhang, Jing Sun, Jianfeng Cao, Lue Chen, Weitao Lu, Wenxiao Li

{"title":"Lunar Radiometric Measurement Based on Observing China Chang’E-3 Lander with VLBI—First Insight","authors":"Song-tao Han, Zhongkai Zhang, Jing Sun, Jianfeng Cao, Lue Chen, Weitao Lu, Wenxiao Li","doi":"10.1155/2019/7018620","DOIUrl":"https://doi.org/10.1155/2019/7018620","url":null,"abstract":"China Chang’E-3 performed soft landing at the plains of Sinus Iridum on lunar surface on December 14th 2013 successfully; it opened a new window for observing lunar surface with radiometric tracking which many lunar scientific researchers always pursue for. Since July 2014, OCEL (Observing Chang’E-3 Lander with VLBI) project has been conducted jointly by IVS (International VLBI Service of Geodesy and Astrometry) and BACC (Beijing Aerospace Control Center), a global IVS R&D network augmented with two China Deep Space Stations configured for OCEL. This paper presents the current status and preliminary result of the OCEL and mainly focuses on determination of the lander position, which is about 7 meter in height and 14 meter in plane of lunar surface with respect to LRO (Lunar Reconnaissance Orbiter). Based on accuracy analysis, further optimized OCEL sessions will make use of this target-of-opportunity, the Chang’E-3 lunar lander, as long as it is working. With higher accurate radiometric observables, more prospective contribution to earth and lunar science is expected by combining with LLR.","PeriodicalId":48962,"journal":{"name":"Advances in Astronomy","volume":" ","pages":""},"PeriodicalIF":1.4,"publicationDate":"2019-06-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1155/2019/7018620","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49182247","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Disk-Integrated Lunar Brightness Temperatures between 89 and 190 GHz 磁盘集成月球亮度温度介于89和190 GHz之间

IF 1.4 4区物理与天体物理

Advances in Astronomy Pub Date : 2019-06-02 DOI: 10.1155/2019/2350476

M. Burgdorf, S. Buehler, I. Hans, M. Prange

引用次数: 8

Extracting Filaments Based on Morphology Components Analysis from Radio Astronomical Images 基于形态学成分分析的射电天文图像细丝提取

IF 1.4 4区物理与天体物理

Advances in Astronomy Pub Date : 2019-06-02 DOI: 10.1155/2019/2397536

M. Zhu, W. Liu, B. Y. Wang, M. Zhang, W. Tian, X. Yu, T. Liang, D. Wu, D. Hu, F. Duan

{"title":"Extracting Filaments Based on Morphology Components Analysis from Radio Astronomical Images","authors":"M. Zhu, W. Liu, B. Y. Wang, M. Zhang, W. Tian, X. Yu, T. Liang, D. Wu, D. Hu, F. Duan","doi":"10.1155/2019/2397536","DOIUrl":"https://doi.org/10.1155/2019/2397536","url":null,"abstract":"Filaments are a type of wide-existing astronomical structure. It is a challenge to separate filaments from radio astronomical images, because their radiation is usually weak. What is more, filaments often mix with bright objects, e.g., stars, which makes it difficult to separate them. In order to extract filaments, A. Men’shchikov proposed a method “getfilaments” to find filaments automatically. However, the algorithm removed tiny structures by counting connected pixels number simply. Removing tiny structures based on local information might remove some part of the filaments because filaments in radio astronomical image are usually weak. In order to solve this problem, we applied morphology components analysis (MCA) to process each singe spatial scale image and proposed a filaments extraction algorithm based on MCA. MCA uses a dictionary whose elements can be wavelet translation function, curvelet translation function, or ridgelet translation function to decompose images. Different selection of elements in the dictionary can get different morphology components of the spatial scale image. By using MCA, we can get line structure, gauss sources, and other structures in spatial scale images and exclude the components that are not related to filaments. Experimental results showed that our proposed method based on MCA is effective in extracting filaments from real radio astronomical images, and images processed by our method have higher peak signal-to-noise ratio (PSNR).","PeriodicalId":48962,"journal":{"name":"Advances in Astronomy","volume":" ","pages":""},"PeriodicalIF":1.4,"publicationDate":"2019-06-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1155/2019/2397536","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47060650","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

The Mid-Term Forecast Method of F10.7 Based on Extreme Ultraviolet Images 基于极紫外图像的F10.7中期预报方法

IF 1.4 4区物理与天体物理

Advances in Astronomy Pub Date : 2019-05-13 DOI: 10.1155/2019/5604092

L. Lei, Q. Zhong, J. Wang, L. Shi, S. Liu

{"title":"The Mid-Term Forecast Method of F10.7 Based on Extreme Ultraviolet Images","authors":"L. Lei, Q. Zhong, J. Wang, L. Shi, S. Liu","doi":"10.1155/2019/5604092","DOIUrl":"https://doi.org/10.1155/2019/5604092","url":null,"abstract":"The solar radio flux at 10.7cm (F10.7) is a direct monitor and an important indicator of solar variability, and F10.7 is commonly used in empirical atmospheric models, ionosphere models, etc. The source regions of F10.7 are mainly in the corona above the active regions, and the extreme ultraviolet (EUV) images reflect the coronal thermal structure. In this paper, an index is defined as PSR based on the intensity values of solar EUV images to represent the coronal contribution to F10.7. The Spearman correlation coefficient between the observed values of F10.7 and PSR is 0.85 in 304 Å EUV images. Based on the high correlation, an empirical model is constructed. Combining the EUV data of SDO/AIA and the twin STEREO/EUVI, solar full-disk EUV images can be generated, and the future 27-day values of PSR can be calculated. Then, a realistic estimation of F10.7 from 1 to 27 days in advance can be provided by the empirical model. Compared to the predictive values of F10.7 by the 54th-order autoregressive models in 2012-2013, the error drop-rate of our model is 12.54%, and our method has significant advantages in the upcoming 3 to 27 days’ forecast.","PeriodicalId":48962,"journal":{"name":"Advances in Astronomy","volume":" ","pages":""},"PeriodicalIF":1.4,"publicationDate":"2019-05-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1155/2019/5604092","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47606965","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 5

A New Image Restoration Method for MUSER 一种新的MUSER图像恢复方法

IF 1.4 4区物理与天体物理

Advances in Astronomy Pub Date : 2019-05-02 DOI: 10.1155/2019/8087405

Wei Wang, Yihua Yan

{"title":"A New Image Restoration Method for MUSER","authors":"Wei Wang, Yihua Yan","doi":"10.1155/2019/8087405","DOIUrl":"https://doi.org/10.1155/2019/8087405","url":null,"abstract":"Solar radio images in decimeter wave range consist of many complicated components including a disk component, some bright and weak compact sources, and many diffuse features. Complicated structures combining these various components maybe cause restoration failure when using conventional algorithms. Furthermore, the images at different frequencies band are pretty different. Therefore, restoration method for solar radio image is different from other radio sources. Some image restoration methods were applied and obtained good results on Nancay radioheliograph images and Nobeyama radioheliograph images, and some new methods were introduced into processing these complicated solar radio images in recent years. For a new radioheliograph with ultrawide frequency band, new image restoration method which can maximize function of telescope is demanded. Different images could be obtained from the same visibilities data by using different weighting functions in imaging processing. In this paper, a new restoration method for solar radio image was proposed. Two images with different weighting functions from the same data are combined in this method. This restoration method has applied to data processing of Mingantu spectral radioheliograph.","PeriodicalId":48962,"journal":{"name":"Advances in Astronomy","volume":" ","pages":""},"PeriodicalIF":1.4,"publicationDate":"2019-05-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1155/2019/8087405","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47196416","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1