Physics and Chemistry of the Earth, Part C: Solar, Terrestrial & Planetary Science最新文献_第6页

Hydrogeological monitoring and image analysis of a mudslide in Southern Italy 意大利南部一次泥石流水文地质监测与图像分析

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)00068-X

M. Polemio , O. Petrucci

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引用次数: 6

Predictions for the propagation of energetic particles from the sun to the earth: influence of the magnetic turbulence 高能粒子从太阳传播到地球的预测:磁湍流的影响

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)00053-8

G. Zimbardo, P. Pommois, P. Veltri

{"title":"Predictions for the propagation of energetic particles from the sun to the earth: influence of the magnetic turbulence","authors":"G. Zimbardo, P. Pommois, P. Veltri","doi":"10.1016/S1464-1917(01)00053-8","DOIUrl":"10.1016/S1464-1917(01)00053-8","url":null,"abstract":"<div><p>Energetic particle fluxes in the Earth's magnetosphere can seriously affect spacecraft operations as well as navigation and communication systems. To this end, and critical issue is to understand and predict whether particles accelerated at a solar flare will impinge on the Earth's magnetosphere. Energetic particle propagation depends on the magnetohydrodynamic turbulence in the solar wind. We present here a Monte Carlo simulation which traces the magnetic field line from the Earth to the solar corona, taking into account both the average Parker spiral magnetic field and the effects of magnetic turbulence. A proper evaluation of the diffusion coefficient is obtained by a numerical simulation of transport in anisotropic magnetic turbulence which takes into account the scaling of the fluctuation level and of the correlation lengths with the distance from the Sun. This numerical code allows to determine, from the observations of a solar flare at given heliographic latitude and longitude, whether energetic particles will come over the magnetosphere or not.</p></div>","PeriodicalId":101026,"journal":{"name":"Physics and Chemistry of the Earth, Part C: Solar, Terrestrial & Planetary Science","volume":"26 8","pages":"Pages 595-599"},"PeriodicalIF":0.0,"publicationDate":"2001-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S1464-1917(01)00053-8","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77186546","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: 1

Ionospheric total electron content behaviour during November 1997 storm 1997年11月风暴期间电离层总电子含量的变化

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)00010-1

L.W. Baran , I.I. Ephishov , I.I. Shagimuratov

引用次数: 15

Energetic tail evolution of auroral electron spectra 极光电子能谱的高能尾演化

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)00091-X

M.P. Leubner

引用次数: 2

Tail pressure release through auroral acceleration 通过极光加速释放尾压

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)00109-4

E.M. Blixt , J. Vogt

{"title":"Tail pressure release through auroral acceleration","authors":"E.M. Blixt , J. Vogt","doi":"10.1016/S1464-1917(00)00109-4","DOIUrl":"10.1016/S1464-1917(00)00109-4","url":null,"abstract":"<div><p>Earthward convecting plasma has to circumvent the Earth on its way from the tail reconnection region to the dayside magnetosphere. This leads to radially sheared flows between the corotating plasmasphere and the low-latitude boundary layer. Consequently, embedded magnetic field lines also become sheared and set-up field-aligned currents which must close in the highly conducting auroral ionosphere. Associated electric fields and plasma motions are relatively small, the auroral ionosphere thus exerts a drag on the magnetic flux tubes embedded in the magnetospheric plasma which in turn affects the pressure distribution in the equatorial magnetosphere. We investigate the role of parallel potential drops in the acceleration region in this context with the help of a steady convection model. Parallel potential drops provide a means to decouple the magnetosphere from the ionosphere, thus they can reduce ionospheric drag to avoid high pressure build-up tailward of the Earth. Relationships between field-aligned currents, pressure gradients, and parallel potential drops are derived and compared with observations. In particular, the current-voltage relationship allows for a determination of the field-aligned resistance which is in good agreement with others estimates.</p></div>","PeriodicalId":101026,"journal":{"name":"Physics and Chemistry of the Earth, Part C: Solar, Terrestrial & Planetary Science","volume":"26 1","pages":"Pages 207-212"},"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)00109-4","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84428202","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: 1

Study of the thermospheric-ionospheric response to intense geomagnetic storms at middle latitudes 中纬度地区热层-电离层对强地磁风暴响应的研究

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)00012-5

A. Belehaki , I. Tsagouri

{"title":"Study of the thermospheric-ionospheric response to intense geomagnetic storms at middle latitudes","authors":"A. Belehaki , I. Tsagouri","doi":"10.1016/S1464-1917(01)00012-5","DOIUrl":"10.1016/S1464-1917(01)00012-5","url":null,"abstract":"<div><p>The ionospheric response to enhanced geomagnetic activity was studied in terms of two ionospheric parameters, f<sub>o</sub>F2 and h'F2, aiming the investigation of the middle latitude positive and negative ionospheric storm effects characteristics. Simultaneous observations from a chain of several middle latitude stations distributed in longitude around the earth during two intense geomagnetic storms (Dst < −100 nT), were analyzed in this work. The correlation results between the f<sub>o</sub>F2 and h'F2 disturbances and the Dst geomagnetic index verified that the morphology of middle latitude ionospheric disturbances in response to geomagnetic storms shows a great degree of variability and a strong dependence on local time observation. Negative deviations constitute the typical ionospheric response. In general it is reported that the F2 layer virtual height h'F2, which is observed only during daytime in conjunction with F1 layer presence, shows clear response to magnetic storm activity. On the other hand, positive ionospheric disturbances are accompanied by weak height enhancements. Real observations were also compared to the thermospheric-ionospheric view associated with positive and negative storm effects proposed by Prolss (1993). This test clearly demonstrates that such a model can capture most of the basic aspects of ionospheric storms, taking into consideration that any new burst of activity is associated to a new disturbance zone, resulting to the formation of a large zone of disturbance that covers the post-midnight and the forenoon sector as well. This mechanism may be the cause of long lasting negative storm effects observed as the typical ionospheric response to geomagnetic storm activity.</p></div>","PeriodicalId":101026,"journal":{"name":"Physics and Chemistry of the Earth, Part C: Solar, Terrestrial & Planetary Science","volume":"26 5","pages":"Pages 353-357"},"PeriodicalIF":0.0,"publicationDate":"2001-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S1464-1917(01)00012-5","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87042426","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: 7

Some purposes and methods of the satellite measurements of the ignorospheric response on the solar flares 卫星测量太阳耀斑对大气响应的一些目的和方法

Physics and Chemistry of the Earth, Part C: Solar, Terrestrial & Planetary Science Pub Date : 2001-01-01 Epub Date: 2001-04-24 DOI: 10.1016/S1464-1917(00)00118-5

S.V. Avakyan

引用次数: 8

Electrodynamic tether system-possibility of realization 电动系绳系统——实现的可能性

Physics and Chemistry of the Earth, Part C: Solar, Terrestrial & Planetary Science Pub Date : 2001-01-01 Epub Date: 2001-04-24 DOI: 10.1016/S1464-1917(00)00121-5

V. Korepanov, F. Dudkin

引用次数: 2

A new computer model for the evaluation of data from acoustic Doppler current profilers (ADCP) 声学多普勒电流剖面仪(ADCP)数据评价的新计算机模型

Physics and Chemistry of the Earth, Part C: Solar, Terrestrial & Planetary Science Pub Date : 2001-01-01 Epub Date: 2002-02-14 DOI: 10.1016/S1464-1917(01)95014-7

M. Adler, U. Nicodemus

引用次数: 14

Influence of infrasonic waves on the ionosphere 次声波对电离层的影响

Physics and Chemistry of the Earth, Part C: Solar, Terrestrial & Planetary Science Pub Date : 2001-01-01 Epub Date: 2001-06-29 DOI: 10.1016/S1464-1917(01)00026-5

V.M. Krasnov , Ya.V. Drobzheva

引用次数: 1