Physics and Chemistry of the Earth, Part C: Solar, Terrestrial & Planetary Science最新文献

Wave mode identification via wave distribution function analysis 通过波分布函数分析识别波型

Physics and Chemistry of the Earth, Part C: Solar, Terrestrial & Planetary Science Pub Date : 2001-01-01 Epub Date: 2001-12-06 DOI: 10.1016/S1464-1917(00)00113-6

T. Oscarsson , G. Stenberg , O. Santolík

引用次数: 11

Instantaneous mapping of ionospheric characteristics using 5-minute measurements for the day of the total solar eclipse of 11 August 1999 利用1999年8月11日日全食当天的5分钟测量资料即时绘制电离层特征图

Physics and Chemistry of the Earth, Part C: Solar, Terrestrial & Planetary Science Pub Date : 2001-01-01 Epub Date: 2001-06-04 DOI: 10.1016/S1464-1917(01)00009-5

I. Stanisławska , T.L. Gulyaeva , D. Altadil , P. Bencze , G. Juchnikowski , Yu.N. Korenkov , G. Sole , Z. Zbyszyński

引用次数: 9

The global distribution of lightning NOx simulated on-line in a general circulation model 大气环流模型在线模拟闪电NOx的全球分布

Physics and Chemistry of the Earth, Part C: Solar, Terrestrial & Planetary Science Pub Date : 2001-01-01 Epub Date: 2001-09-17 DOI: 10.1016/S1464-1917(01)00051-4

L. Jourdain , D.A. Hauglustaine

引用次数: 52

A dynamically configurable system for operational processing of space weather data 一种用于空间天气数据操作处理的动态配置系统

Physics and Chemistry of the Earth, Part C: Solar, Terrestrial & Planetary Science Pub Date : 2001-01-01 Epub Date: 2001-09-17 DOI: 10.1016/S1464-1917(01)00054-X

A. Wehrenpfennig , N. Jakowski , J. Wickert

引用次数: 40

Fine-scale optical observations of Aurora 极光的精细光学观测

Physics and Chemistry of the Earth, Part C: Solar, Terrestrial & Planetary Science Pub Date : 2001-01-01 Epub Date: 2001-12-06 DOI: 10.1016/S1464-1917(00)00105-7

T.S. Trondsen, L.L. Cogger

引用次数: 14

Particle acceleration linked to Alfvén wave propagation on small scale density gradients 粒子加速与小尺度密度梯度上的alfvsamn波传播有关

Physics and Chemistry of the Earth, Part C: Solar, Terrestrial & Planetary Science Pub Date : 2001-01-01 Epub Date: 2001-12-06 DOI: 10.1016/S1464-1917(00)00111-2

V. Génot , F. Mottez , P. Louarn

引用次数: 14

Linear and nonlinear dispersive effects on magnetospheric field line resonances 磁层场线共振的线性和非线性色散效应

Physics and Chemistry of the Earth, Part C: Solar, Terrestrial & Planetary Science Pub Date : 2001-01-01 Epub Date: 2001-12-06 DOI: 10.1016/S1464-1917(00)00098-2

R. Rankin , V.T. Tikhonchuk

{"title":"Linear and nonlinear dispersive effects on magnetospheric field line resonances","authors":"R. Rankin , V.T. Tikhonchuk","doi":"10.1016/S1464-1917(00)00098-2","DOIUrl":"https://doi.org/10.1016/S1464-1917(00)00098-2","url":null,"abstract":"<div><p>Shear Alfvén wave dispersion produced by electron inertia, ion gyro-kinetic and electron thermal pressure is modeled using two-fluid MHD and kinetic theory. In a dipolar magnetosphere, dispersion and non-linearity determine the spatial structure, temporal evolution and amplitude of parallel electric fields and large amplitude density fluctuations near to the polar ionosphere. Deep auroral density cavities are found to have a strong influence on auroral electric field generation. Many features of satellite and ground based observations of discrete arcs are predicted using two-fluid MHD, but large parallel electric fields (mV/m) and keV electron precipitation cannot easily be explained. To explain the observed electric fields it is necessary to evaluate the non-local kinetic electron response to standing shear Alfvén waves on dipolar magnetic field lines. It is shown that electron trapping leads to a significant reduction of the collisionless electron conductivity and a large enhancement of parallel electric fields in the 1 – 4 mHz frequency range of observed field line resonances.</p></div>","PeriodicalId":101026,"journal":{"name":"Physics and Chemistry of the Earth, Part C: Solar, Terrestrial & Planetary Science","volume":"26 1","pages":"Pages 121-131"},"PeriodicalIF":0.0,"publicationDate":"2001-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S1464-1917(00)00098-2","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91669471","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: 3

Formation of electrostatic potential drops in the auroral zone 在极光区静电电位下降的形成

Physics and Chemistry of the Earth, Part C: Solar, Terrestrial & Planetary Science Pub Date : 2001-01-01 Epub Date: 2001-12-06 DOI: 10.1016/S1464-1917(00)00092-1

D. Schriver , M. Ashour-Abdalla , R.L. Richard

{"title":"Formation of electrostatic potential drops in the auroral zone","authors":"D. Schriver , M. Ashour-Abdalla , R.L. Richard","doi":"10.1016/S1464-1917(00)00092-1","DOIUrl":"https://doi.org/10.1016/S1464-1917(00)00092-1","url":null,"abstract":"<div><p>In order to examine the self-consistent formation of large-scale quasi-static parallel electric fields in the auroral zone on a micro/meso scale, a particle in cell simulation has been developed. The code resolves electron Debye length scales so that electron micro-processes are included and a variable grid scheme is used such that the overall length scale of the simulation is of the order of an Earth radii along the magnetic field. The simulation is electrostatic and includes the magnetic mirror force, as well as two types of plasmas, a cold dense ionospheric plasma and a warm tenuous magnetospheric plasma. In order to study the formation of parallel electric fields in the auroral zone, different magnetospheric ion and electron inflow boundary conditions are used to drive the system. It has been found that for conditions in the primary (upward) current region an upward directed quasi-static electric field can form across the system due to magnetic mirroring of the magnetospheric ions and electrons at different altitudes. For conditions in the return (downward) current region it is shown that a quasi-static parallel electric field in the opposite sense of that in the primary current region is formed, i.e., the parallel electric field is directed earthward. The conditions for how these different electric fields can be formed are discussed using satellite observations and numerical simulations.</p></div>","PeriodicalId":101026,"journal":{"name":"Physics and Chemistry of the Earth, Part C: Solar, Terrestrial & Planetary Science","volume":"26 1","pages":"Pages 65-70"},"PeriodicalIF":0.0,"publicationDate":"2001-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S1464-1917(00)00092-1","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91669909","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: 4

Preliminary results on the within-the-hour ionospheric variability 电离层小时内变率的初步结果

Physics and Chemistry of the Earth, Part C: Solar, Terrestrial & Planetary Science Pub Date : 2001-01-01 Epub Date: 2001-06-04 DOI: 10.1016/S1464-1917(01)00005-8

D.N. Fotiadis , S.S. Kouris , B. Zolesi

引用次数: 4

Experimental investigations and simulations of quasi-steady potential drops in plasmas 等离子体准稳定电位降的实验研究与模拟

Physics and Chemistry of the Earth, Part C: Solar, Terrestrial & Planetary Science Pub Date : 2001-01-01 Epub Date: 2001-12-06 DOI: 10.1016/S1464-1917(00)00093-3

S. Torvén, M. Wendt

{"title":"Experimental investigations and simulations of quasi-steady potential drops in plasmas","authors":"S. Torvén, M. Wendt","doi":"10.1016/S1464-1917(00)00093-3","DOIUrl":"10.1016/S1464-1917(00)00093-3","url":null,"abstract":"<div><p>Magnetic-field-aligned potential drops in the auroral zone have recently been interpreted in terms of “quasi-steady” states which are evaluated for a fixed, given ion density profile. Here we present experimental studies of such states, observed when a voltage drop is suddenly applied to an inhomogeneous plasma column with a homogeneous, axial magnetic field. The quasi-steady potential drops have a spatial extension related to the gradient length of the initial ion density and the potential profile steepens slowly to a U-shaped double layer on the ion time scale. They exist only when the applied voltage drop does not exceed a critical value which depends on the maximum difference in ion density. Higher voltage drops concentrate in a cathode sheath. Results from PIC-simulations and from a theoretical model, based on steady electron motion, are also presented. They agree excellently for times up to about an ion plasma period (ω<sub>pi</sub><sup>−1</sup>). The theoretical current-voltage characteristic, which is determined by electron reflection at a virtual cathode formed in the plasma, agrees with the experiments up to about one ω<sub>pi</sub><sup>−1</sup>. However, already at about 4ω<sub>pi</sub><sup>−1</sup> the measured currents have dropped much below the theoretical values, and also the measured average potential profiles are inconsistent with steady acceleration of the electrons. The increased resistivity is associated with strong fluctuations.</p></div>","PeriodicalId":101026,"journal":{"name":"Physics and Chemistry of the Earth, Part C: Solar, Terrestrial & Planetary Science","volume":"26 1","pages":"Pages 71-80"},"PeriodicalIF":0.0,"publicationDate":"2001-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S1464-1917(00)00093-3","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90812247","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