2011 XXXth URSI General Assembly and Scientific Symposium最新文献

Developments in the radio search for extraterrestrial intelligence 无线电搜寻地外智慧生物的进展

2011 XXXth URSI General Assembly and Scientific Symposium Pub Date : 2013-06-06 DOI: 10.1109/USNC-URSI-NRSM.2013.6525027

A. Siemion, D. Werthimer, D. Anderson, H. Chen, J. Cobb, J. Cordes, T. Filiba, G. Foster, S. Gowda, E. Korpela, M. Lebofsky, A. Little, W. Mallard, L. Spitler, M. Wagner

引用次数: 0

Dynamics of quasi-perpendicular shocks: Recent results issued from 2D PIC simulation 准垂直冲击动力学:二维PIC模拟的最新结果

2011 XXXth URSI General Assembly and Scientific Symposium Pub Date : 2011-11-21 DOI: 10.1109/URSIGASS.2011.6051058

T. Umeda, Yoshitaka Kidani, S. Matsukiyo

引用次数: 0

Quasi periodic echoes induced by a partial solar eclipse 由日偏食引起的准周期性回声

2011 XXXth URSI General Assembly and Scientific Symposium Pub Date : 2011-11-21 DOI: 10.1109/URSIGASS.2011.6051015

Smitha V. Thamyi, M. Yamamoto, H. Liu, S. Saito, Y. Otsuka, A. Paira

引用次数: 0

Development of electrodeless electric propulsion systems using high-density helicon plasmas: The HEAT project 使用高密度螺旋等离子体的无极电力推进系统的发展:HEAT项目

2011 XXXth URSI General Assembly and Scientific Symposium Pub Date : 2011-11-21 DOI: 10.1109/URSIGASS.2011.6051085

T. Motomura, S. Shinohara, T. Tanikawa, T. Hada, I. Funaki, H. Nishida, K. P. Shamrai, T. Matsuoka, F. Otsuka, T. S. Rudenko, E. Ohno, Kenji Yokoi, Takahiro T. Nakamura

引用次数: 5

Analysis of the influence of the position of the mobile on SAR induced using polynomial chaos decomposition 利用多项式混沌分解分析机动机位对SAR的影响

2011 XXXth URSI General Assembly and Scientific Symposium Pub Date : 2011-10-20 DOI: 10.1109/URSIGASS.2011.6051367

A. Ghanmi, Y. Pinto, A. Hadjem, E. Conil, A. Gati, O. Picon, J. Wiart

引用次数: 2

Six-port wave correlator theory and practical application to RF network analysis 六端口波相关器理论及在射频网络分析中的实际应用

2011 XXXth URSI General Assembly and Scientific Symposium Pub Date : 2011-10-20 DOI: 10.1109/URSIGASS.2011.6050571

T. Yakabe

引用次数: 1

Influence of return stroke speed and leader line charge density on lightning corona sheath dynamics 回冲速度和引线电荷密度对雷电电晕护套动力学的影响

2011 XXXth URSI General Assembly and Scientific Symposium Pub Date : 2011-10-20 DOI: 10.1109/URSIGASS.2011.6050701

G. Masłowski, V. Rakov

引用次数: 0

Physical, technical, practical, economical, and regulatory aspects of spectrum management 频谱管理的物理、技术、实用、经济和监管方面

2011 XXXth URSI General Assembly and Scientific Symposium Pub Date : 2011-10-20 DOI: 10.1109/URSIGASS.2011.6050719

T. Tjelta, R. Struzak

引用次数: 0

ULF geomagnetic changes possibly associated with the 2008 Iwate-Miyagi Nairiku earthquake 极低频地磁变化可能与2008年岩手宫城内陆地震有关

2011 XXXth URSI General Assembly and Scientific Symposium Pub Date : 2011-10-20 DOI: 10.1109/URSIGASS.2011.6051046

Takuya Hirano, K. Hattori, P. Hang, Y. Ishiguro

{"title":"ULF geomagnetic changes possibly associated with the 2008 Iwate-Miyagi Nairiku earthquake","authors":"Takuya Hirano, K. Hattori, P. Hang, Y. Ishiguro","doi":"10.1109/URSIGASS.2011.6051046","DOIUrl":"https://doi.org/10.1109/URSIGASS.2011.6051046","url":null,"abstract":"Anomalous ULF geomagnetic field changes associated with earthquake is one of the most convincing and promising phenomena due to deeper skin depth. Since ULF signals associated with large earthquakes are weak, effective signal discrimination methods should be required. In this study, we investigate ULF geomagnetic changes possibly associated with the 2008 Iwate-Miyagi Nairiku earthquake based on spectral density ratio analysis, geomagnetic transfer function analysis, fractal analysis, and direction finding analysis. Geomagnetic data observed at Esashi, where the epicentral distance is about 47 km and Kakioka, the distance is about 317 km, and as a reference station have been analyzed. Wavelet transform have been performed for the spectral density analysis instead of FFT method. Before the earthquake, the variation of spectral density ratio, Sz/Sx and Sz/Sy, at the nearest station of Esashi exhibits an apparent increase from the trend. On the contrary, there are no corresponding significant changes at a remote station of Kakioka. The level of peak is beyond the 3 σ and its duration is 3 days. The lead time is about 3–4 weeks before the earthquake. At the periods from 3 to 105 sec, similar anomalous changes occurred. Results of transfer function analysis are similar. Fractal analysis and direction finding analysis have been also applied. The obtained fractal dimension and direction of arrival of ULF waves show the possible relation to the earthquake. These facts suggest the anomalous change is a possible candidate of earthquake-related ULF magnetic change.","PeriodicalId":325870,"journal":{"name":"2011 XXXth URSI General Assembly and Scientific Symposium","volume":"49 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-10-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121802878","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 10

Propagation characteristics of VLF signal and lightning sferics within equatorial Earth-ionosphere waveguide during two solar eclipses 两次日食期间赤道地球电离层波导中VLF信号和闪电序列的传播特性

2011 XXXth URSI General Assembly and Scientific Symposium Pub Date : 2011-10-20 DOI: 10.1109/URSIGASS.2011.6051052

A. Guha, B. K. De, R. Roy, A. Choudhury

{"title":"Propagation characteristics of VLF signal and lightning sferics within equatorial Earth-ionosphere waveguide during two solar eclipses","authors":"A. Guha, B. K. De, R. Roy, A. Choudhury","doi":"10.1109/URSIGASS.2011.6051052","DOIUrl":"https://doi.org/10.1109/URSIGASS.2011.6051052","url":null,"abstract":"Two long duration solar eclipses having totality over Earth's equatorial region, within a period of six months is a rare event. The results from such two solar eclipses, one on 22nd July, 2009 and another on 15th January, 2010, on VLF propagation is presented in this paper. From the amplitude variation of a transmitted VLF navigational signal at 18.2 kHz (VTX3, 8.38° N, 77.75° E) over a Great Circle Path (GCP) of 2200 km, the virtual reflection height H′ and inverse scale height parameter (β) of the eclipsed lower ionosphere are estimated. Modeling shows that during maximum eclipse over the path, an average 80% drop in electron density occurs at a height of 71 km at the equatorial lower ionosphere. At the same time, the intensity of sferics from lightning at different frequencies is found to increase during both the eclipses. The spectral variations of sferics increment in both the eclipses are almost identical having a correlation coefficient of 0.88 with a statistical significance of 98%. The results are explained on the basis of decrease in electron density at the lower ionosphere, modifying the reflection coefficient which affected the propagation of VLF sferics in Earth-ionosphere waveguide under eclipsed condition.","PeriodicalId":325870,"journal":{"name":"2011 XXXth URSI General Assembly and Scientific Symposium","volume":"3 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-10-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116801574","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0