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Planetary wave oscillations in the occurrence time of Equatorial Spread-F 赤道扩散- f发生时间内的行星波振荡
2011 XXXth URSI General Assembly and Scientific Symposium Pub Date : 2011-10-20 DOI: 10.1109/URSIGASS.2011.6050977
C. Vineeth, L. Jose, T. Pant
{"title":"Planetary wave oscillations in the occurrence time of Equatorial Spread-F","authors":"C. Vineeth, L. Jose, T. Pant","doi":"10.1109/URSIGASS.2011.6050977","DOIUrl":"https://doi.org/10.1109/URSIGASS.2011.6050977","url":null,"abstract":"This paper presents the role of planetary waves in modulating the occurrence time of Equatorial Spread F (ESF). The investigation has been carried out using the data from the digital Ionosonde and Proton Precession Magnetometer located over Trivandrum, India (8.5° E; 77° N; 0.5° N dip lat.). The analysis shows that the start-time of the ESF during the winter months is modulated significantly by a planetary wave of quasi-16-day periodicity. It is suggested that these waves are propagated to ionospheric altitudes from lower atmosphere through modified electrodynamics since the equatorial electrojet and pre-reversal enhancement were also showed the same oscillations.","PeriodicalId":325870,"journal":{"name":"2011 XXXth URSI General Assembly and Scientific Symposium","volume":"23 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":"134323591","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
Statistical study of the NTC plasmaspheric patches: A direct link between wave observation in the inner magnetosphere and magnetic activity NTC等离子体层斑块的统计研究:内磁层波观测与磁活动之间的直接联系
2011 XXXth URSI General Assembly and Scientific Symposium Pub Date : 2011-10-20 DOI: 10.1109/URSIGASS.2011.6051093
S. Grimald, F. Mazouz, C. Foullon, P. Décréau
{"title":"Statistical study of the NTC plasmaspheric patches: A direct link between wave observation in the inner magnetosphere and magnetic activity","authors":"S. Grimald, F. Mazouz, C. Foullon, P. Décréau","doi":"10.1109/URSIGASS.2011.6051093","DOIUrl":"https://doi.org/10.1109/URSIGASS.2011.6051093","url":null,"abstract":"Variations in the solar wind are responsible of reconfiguration of the whole magnetosphere. The plasmapause is located in the inner magnetosphere and a direct link between its characteristics and the magnetic activity has been shown. NTC is believed to be emitted at the plasmapause and near the magnetic equator. The changes of the plasmapause due to solar wind variations may be reflected in the wave signature. Using three years of Cluster data we perform a statistical study. We show that their observation is linked with a compression of the plasmapause, and an increasing of the magnetic indices.","PeriodicalId":325870,"journal":{"name":"2011 XXXth URSI General Assembly and Scientific Symposium","volume":"78 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":"131515899","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
Energy patterns of the prototype Impulse-Radiating Antenna 脉冲辐射天线原型的能量图
2011 XXXth URSI General Assembly and Scientific Symposium Pub Date : 2011-10-20 DOI: 10.1109/URSIGASS.2011.6050712
D. Giri, F. Tesche
{"title":"Energy patterns of the prototype Impulse-Radiating Antenna","authors":"D. Giri, F. Tesche","doi":"10.1109/URSIGASS.2011.6050712","DOIUrl":"https://doi.org/10.1109/URSIGASS.2011.6050712","url":null,"abstract":"A question that often comes up in the context of an Impulse-Radiating Antenna (IRA) is “How is the transient energy from the pulser radiated in space”? Of course, the electromagnetic fields (both E and H), the power density and the energy density have their maximum on the boresight. The power pattern is a well-defined frequency domain concept, but it is a cumbersome descriptor for hyperband antennas like the IRA because of the multitude of frequencies involved. In this paper we explore the concept of an energy pattern, which is valid both in time and frequency domains. An energy pattern is useful in visualizing where the transient energy injected into the IRA is going. It is further noted that the energy and power patterns are identical for a CW antenna, but they can be vastly different for pulsed antennas.","PeriodicalId":325870,"journal":{"name":"2011 XXXth URSI General Assembly and Scientific Symposium","volume":"1 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":"131709396","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: 2
Monitoring D-region variability from lightning measurements 从闪电测量监测d区变化
2011 XXXth URSI General Assembly and Scientific Symposium Pub Date : 2011-10-20 DOI: 10.1109/URSIGASS.2011.6050887
F. Simões, J. Berthelier, R. Pfaff, D. Bilitza, J. Klenzing
{"title":"Monitoring D-region variability from lightning measurements","authors":"F. Simões, J. Berthelier, R. Pfaff, D. Bilitza, J. Klenzing","doi":"10.1109/URSIGASS.2011.6050887","DOIUrl":"https://doi.org/10.1109/URSIGASS.2011.6050887","url":null,"abstract":"In situ measurements of ionospheric D-region characteristics are somewhat scarce and rely mostly on sounding rockets. Remote sensing techniques employing Very Low Frequency (VLF) transmitters can provide electron density estimates from subionospheric wave propagation modeling. Here we discuss how lightning waveform measurements, namely sferics and tweeks, can be used for monitoring the D-region variability and day-night transition, and for local electron density estimates. A brief comparison among D-region aeronomy models is also presented.","PeriodicalId":325870,"journal":{"name":"2011 XXXth URSI General Assembly and Scientific Symposium","volume":"20 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":"128924246","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: 2
Role of the surface charging in the solar wind interaction with a small, non-magnetized, electrically non-conducting body studied in a two-dimensional electromagnetic full particle simulation 在二维电磁全粒子模拟中研究了太阳风与一个小的、非磁化的、不导电的体相互作用中表面电荷的作用
2011 XXXth URSI General Assembly and Scientific Symposium Pub Date : 2011-10-20 DOI: 10.1109/URSIGASS.2011.6051095
T. Nakagawa
{"title":"Role of the surface charging in the solar wind interaction with a small, non-magnetized, electrically non-conducting body studied in a two-dimensional electromagnetic full particle simulation","authors":"T. Nakagawa","doi":"10.1109/URSIGASS.2011.6051095","DOIUrl":"https://doi.org/10.1109/URSIGASS.2011.6051095","url":null,"abstract":"The solar wind interaction with a small, non-magnetized, electrically non-conducting body is studied using a two-dimensional electromagnetic full particle simulation. The solar wind magnetic field is introduced into the simulation scheme as an initial condition together with the electric field generated by the motion of the solar wind. The solar wind magnetic field controls the direction of flow of thermal electrons, causing an asymmetry of the negative charging of the downstream side surface. In the absence of the photoelectrons, the solar wind electrons are expelled by the negative charging at the terminator, and behave differently from traditional theory.","PeriodicalId":325870,"journal":{"name":"2011 XXXth URSI General Assembly and Scientific Symposium","volume":"1 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":"131009591","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
Long-distance propagation effects in the HF signals from different heating facilities observed with using passive Doppler sounding equipment at Irkutsk 利用伊尔库茨克被动多普勒测深设备观测不同加热设施高频信号的远距离传播效应
2011 XXXth URSI General Assembly and Scientific Symposium Pub Date : 2011-10-20 DOI: 10.1109/URSIGASS.2011.6050875
O. Berngardt, V. G. Abramov, N. Blagoveschenskaya, V. Frolov, V. Kurkin, S. Ponomarchuk
{"title":"Long-distance propagation effects in the HF signals from different heating facilities observed with using passive Doppler sounding equipment at Irkutsk","authors":"O. Berngardt, V. G. Abramov, N. Blagoveschenskaya, V. Frolov, V. Kurkin, S. Ponomarchuk","doi":"10.1109/URSIGASS.2011.6050875","DOIUrl":"https://doi.org/10.1109/URSIGASS.2011.6050875","url":null,"abstract":"We present the first observation results of long-distance propagation effects of short radio waves at pump frequency, observed by passive Doppler sounding equipment at Irkutsk during heating facilities operation. We demonstrate two effects: dependence of the received signal amplitude on the propagation path during power-stepping mode and difference between experimental observations and propagation expectations according to our model.","PeriodicalId":325870,"journal":{"name":"2011 XXXth URSI General Assembly and Scientific Symposium","volume":"18 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":"131016704","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
Wave activity in the foot region of a quasi-perpendicular shock: 3-D PIC simulation results 准垂直震波脚区的波活动性:三维PIC模拟结果
2011 XXXth URSI General Assembly and Scientific Symposium Pub Date : 2011-10-20 DOI: 10.1109/URSIGASS.2011.6051144
I. Shinohara, M. Fujimoto
{"title":"Wave activity in the foot region of a quasi-perpendicular shock: 3-D PIC simulation results","authors":"I. Shinohara, M. Fujimoto","doi":"10.1109/URSIGASS.2011.6051144","DOIUrl":"https://doi.org/10.1109/URSIGASS.2011.6051144","url":null,"abstract":"We have carried out a 3-D full particle simulation of a quasi-perpendicular shock. The full mass ratio M/m=1840 was taken for this simulation, and almost one ion inertia length square was set for the plane perpendicular to the upstream flow. Complicated wave activity is found in the shock transition region, and comparing with lower dimensional simulations with the same parameters, strong electromagnetic wave activity is found at the most frontier of the shock foot only in the 3-D result. We will discuss the observed 3-D nature of wave activity in the shock transition region.","PeriodicalId":325870,"journal":{"name":"2011 XXXth URSI General Assembly and Scientific Symposium","volume":"56 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":"131220879","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
LOFAR: A powerful and flexible observatory for pulsars and fast transients LOFAR:一个强大而灵活的脉冲星和快速瞬变天文台
2011 XXXth URSI General Assembly and Scientific Symposium Pub Date : 2011-10-20 DOI: 10.1109/URSIGASS.2011.6051191
J. Hessels, B. Stappers, Lofar Consortium
{"title":"LOFAR: A powerful and flexible observatory for pulsars and fast transients","authors":"J. Hessels, B. Stappers, Lofar Consortium","doi":"10.1109/URSIGASS.2011.6051191","DOIUrl":"https://doi.org/10.1109/URSIGASS.2011.6051191","url":null,"abstract":"The Low-Frequency Array (LOFAR) is a sparse aperture array radio telescope that can observe from 10–240 MHz — i.e. the lowest radio frequencies observable from Earth. Construction of the LOFAR core is all but complete and regular observations of pulsars and other rapidly varying radio sources have begun. With it's huge field-of-view (FoV), flexible multi-beaming capabilities, and large collecting area, LOFAR promises to revolutionize observations of transient radio phenomena with durations of nanoseconds to years. Here we highlight a few of the most recent LOFAR pulsar observations, which demonstrate that the system is already producing science-quality data.","PeriodicalId":325870,"journal":{"name":"2011 XXXth URSI General Assembly and Scientific Symposium","volume":"62 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":"132818669","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: 2
Extended heating of the nighttime D region by very low frequency transmitters 通过极低频发射机延长夜间D区的加热
2011 XXXth URSI General Assembly and Scientific Symposium Pub Date : 2011-10-20 DOI: 10.1109/URSIGASS.2011.6051166
K. Graf, U. Inan, M. Spasojević, N. Lehtinen
{"title":"Extended heating of the nighttime D region by very low frequency transmitters","authors":"K. Graf, U. Inan, M. Spasojević, N. Lehtinen","doi":"10.1109/URSIGASS.2011.6051166","DOIUrl":"https://doi.org/10.1109/URSIGASS.2011.6051166","url":null,"abstract":"Very low frequency (VLF, 3–30 kHz) signals propagating in the Earth-ionosphere waveguide are used to probe the heated nighttime D region over three keyed U.S. Navy VLF transmitters. The keyed VLF transmitters are turned on-off in periodic formats for thirty to sixty minutes each day over the course of several months each, providing sensitive measurements of their heating effect on the surrounding ionosphere. On several occasions, the heating effect is observed on probe signal pathways at distances greater than 1500 km from the keyed transmitter. It is proposed that the heating effect of VLF transmitters extends over very large distances through the subionospheric propagation of its radiated signal. General statistics are presented on the observed extent of the heating region over the course of the experiments, and a combination of propagation, heating, and scattering models are used to analyze the results.","PeriodicalId":325870,"journal":{"name":"2011 XXXth URSI General Assembly and Scientific Symposium","volume":"111 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":"133392430","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
Constraints on the temporal dispersion of passive metamaterials 被动超材料时间色散的约束
2011 XXXth URSI General Assembly and Scientific Symposium Pub Date : 2011-10-20 DOI: 10.1109/URSIGASS.2011.6050384
M. Gustafsson, D. Sjoberg
{"title":"Constraints on the temporal dispersion of passive metamaterials","authors":"M. Gustafsson, D. Sjoberg","doi":"10.1109/URSIGASS.2011.6050384","DOIUrl":"https://doi.org/10.1109/URSIGASS.2011.6050384","url":null,"abstract":"Metamaterial applications such as cloaking, perfect lenses, and artificial permeability are restricted by the frequency dependence of the permittivity, permeability, and index of refraction. Here, causality and passivity together with integral identities for Herglotz functions are used to construct sum rules. The sum rules relate the frequency dependence of the material parameters with their high- and low-frequency values. The corresponding physical bounds determine the minimum variations of the material parameters over a frequency interval. The results are illustrated with a numerical example for artificial permeability.","PeriodicalId":325870,"journal":{"name":"2011 XXXth URSI General Assembly and Scientific Symposium","volume":"6 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":"133435343","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
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