International Journal of Geomagnetism and Aeronomy最新文献_第6页

On the relation of giant pulsations (Pg) to pulsations in the PC1 band (the 讨论了大脉动(Pg)与PC1波段脉动的关系

International Journal of Geomagnetism and Aeronomy Pub Date : 2004-10-01 DOI: 10.1029/2003GI000062

N. Kurazhkovskaya, B. Klain, B. Dovbnya, O. Zotov

{"title":"On the relation of giant pulsations (Pg) to pulsations in the PC1 band (the","authors":"N. Kurazhkovskaya, B. Klain, B. Dovbnya, O. Zotov","doi":"10.1029/2003GI000062","DOIUrl":"https://doi.org/10.1029/2003GI000062","url":null,"abstract":"[1] Using the data of several observatories in the Northern and Southern Hemispheres distanced by latitude and longitude, the analysis of simultaneous observations of geomagnetic pulsations in two frequency ranges ((7.0‐22.0) mHz, the giant pulsations (Pg), and (0.5‐ 2.0) Hz, the pulsations of the Pc1 (“pearls”) type) is performed. It is found that in 70% cases the Pg pulsations observed at auroral and middle latitudes are registered against a background of a global excitation of pearls series. The Pg pulsation period (T) is proportional to the period of repetition of pearls ( ), and the T/ ratio is controlled by the value of the Dst variation. The intensity of the latter is governed by protons injected from the tail to the daytime side of the magnetosphere during the recovery phase of a storm. The results obtained are an indirect experimental confirmation of the fact that protons with energy of 10‐80 keV participate in generation of the Pg pulsations. INDEX TERMS: 2431 Ionosphere: Ionosphere/magnetosphere interactions; 2716 Magnetospheric Physics: Energetic particles, precipitating; 2788 Magnetospheric Physics: Storms and substorms; KEYWORDS: Giant pulsations; Pulsations of the “pearl” series; Protons and Pg pulsations.","PeriodicalId":135868,"journal":{"name":"International Journal of Geomagnetism and Aeronomy","volume":"40 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131054395","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

Ionospheric effects of the magnetic storm on 18-22 August 2003 according to the data of HF sounding of the artificial ionospheric turbulence 2003年8月18-22日磁暴的电离层效应——基于人工电离层湍流高频探测资料

International Journal of Geomagnetism and Aeronomy Pub Date : 2004-07-01 DOI: 10.1029/2003GI000059

V. P. Uryadov

引用次数: 0

Correction to “Observations of neutral winds and electric fields using backscatter from field-aligned irregularities” 修正“利用场向不规则的后向散射观测中性风和电场”

International Journal of Geomagnetism and Aeronomy Pub Date : 2004-07-01 DOI: 10.1029/2004GI000086

A. Mikhailov

引用次数: 12

Editorial: Introducing “Discussion Papers” 社论:介绍“讨论文件”

International Journal of Geomagnetism and Aeronomy Pub Date : 2004-07-01 DOI: 10.1029/2004GI000075

O. Raspopov, R. W. Smith

引用次数: 0

Studies of the structure and dynamics of the D region of the polar ionosphere during solar flares in April 2004 2004年4月太阳耀斑期间极地电离层D区的结构和动力学研究

International Journal of Geomagnetism and Aeronomy Pub Date : 1900-01-01 DOI: 10.1029/2005GI000107

V. Tereshchenko, E. Vasilev, O. Ogloblina, V. Tereshchenko, S. Chernyakov

引用次数: 1

Electron collision frequency and HF waves attenuation in the ionosphere 电离层中电子碰撞频率与高频波衰减

International Journal of Geomagnetism and Aeronomy Pub Date : 1900-01-01 DOI: 10.1029/2004GI000081

N. Danilkin

{"title":"Electron collision frequency and HF waves attenuation in the ionosphere","authors":"N. Danilkin","doi":"10.1029/2004GI000081","DOIUrl":"https://doi.org/10.1029/2004GI000081","url":null,"abstract":"[1] The results of the studies of the effective electron collision frequency and HF wave attenuation in the midlatitude ionosphere carried out in the Rostov-on-Don University during the past 35 years are presented. It is found that (besides the collision absorption) the attenuation is determined also by additional dissipative and nondissipative mechanisms. The absorption is reliably determined using the gas-kinetic model of the effective electron collision frequency. The additional dissipation mechanism (anomalous absorption of ordinary waves) may occur because of their statistical transformation into slow extraordinary waves at the scattering at small-scale fluctuations of the electron concentration. The only cause of the nondissipative attenuation is the small-angle multiple forward scattering at largescale irregularities of the ionospheric plasma. At signal propagation in the vicinity of the maximum usable frequency (MUF) the scattering provides an input into the attenuation comparable to the collision absorption. At the illumination of the ionosphere by a point source from the Earth surface, the multiple scattering leads to such distribution of the field at which the emission reflected under small angles to the vertical has an energy deficit. Presence of addition (to the collision) absorption mechanisms of HF waves attenuation leads to overestimated (as compared to the gas-kinetic ones) estimates of the electron collision frequency. The determination of the physical nature of the attenuation made it possible to develop correct methods of modeling of HF radio waves propagation in the three-dimensional inhomogeneous magnetically active ionospheric plasma and test these methods in a vast series of experiments.","PeriodicalId":135868,"journal":{"name":"International Journal of Geomagnetism and Aeronomy","volume":"60 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123380228","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

Main phases of the solar cycle in the galactic cosmic ray intensity 太阳周期的主要阶段在银河系宇宙射线强度

International Journal of Geomagnetism and Aeronomy Pub Date : 1900-01-01 DOI: 10.1029/2004GI000070

M. Krainev

引用次数: 2

Magnetic field and turbulent velocities in the solar corona 日冕中的磁场和湍流速度

International Journal of Geomagnetism and Aeronomy Pub Date : 1900-01-01 DOI: 10.1029/2004GI000088

A. B. Delone

引用次数: 1

Forecasting of the critical frequency of the ionosphereF2 layer by the method of artificial neural networks 用人工神经网络方法预测电离层ef2层临界频率

International Journal of Geomagnetism and Aeronomy Pub Date : 1900-01-01 DOI: 10.1029/2004GI000065

N. Barkhatov

引用次数: 12

Variability of horizontal component of geomagnetic element (H) with mean quiet-day variation 地磁元(H)水平分量随平均静日变化的变化

International Journal of Geomagnetism and Aeronomy Pub Date : 1900-01-01 DOI: 10.1029/2005GI000109

F. Okeke

{"title":"Variability of horizontal component of geomagnetic element (H) with mean quiet-day variation","authors":"F. Okeke","doi":"10.1029/2005GI000109","DOIUrl":"https://doi.org/10.1029/2005GI000109","url":null,"abstract":"[1] The variability of Sq(H) with mean quiet-day variation at equatorial electrojet latitudes and other latitudes has been studied using the correlation between the hourly amplitudes of the H variations dH, at these stations. It was found that these hourly amplitudes of H under equatorial electrojet regions are well correlated with themselves. High significant correlation was established among them. On the other hand, low correlation was found among pairs of equatorial electrojet stations and other latitude stations not under the equatorial electrojet. It was discovered that most times, the variation in the current intensities of the worldwide part of Sq (WSq) and the equatorial electrojet (EEJ) have contrasting phases. It was concluded that the very low correlation coecients calculated and the contrasting phases of EEJ and WSq current intensities were due to the fact that changes in EEJ current intensity are controlled mainly by Ez, while changes in WSq current are driven mainly by Ey. INDEX TERMS: 2409 Ionosphere: Current systems; 2736 Magnetospheric Physics: Magnetosphere/ionosphere interactions; 2712 Magnetospheric Physics: Electric fields; KEYWORDS: Equatorial electrojet; Geomagnetic field; Current system.","PeriodicalId":135868,"journal":{"name":"International Journal of Geomagnetism and Aeronomy","volume":"14 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126409886","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