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International Journal of Geomagnetism and Aeronomy最新文献

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Turbulent and directed mass motions in various structures of the low corona 低日冕各种结构中的湍流和定向质量运动
International Journal of Geomagnetism and Aeronomy Pub Date : 2007-07-25 DOI: 10.1029/2006GI000151
A. B. Delone, G. V. Yakunina, G. A. Porfir’eva, O. Smirnova
{"title":"Turbulent and directed mass motions in various structures of the low corona","authors":"A. B. Delone, G. V. Yakunina, G. A. Porfir’eva, O. Smirnova","doi":"10.1029/2006GI000151","DOIUrl":"https://doi.org/10.1029/2006GI000151","url":null,"abstract":"[1] A brief review on turbulent and ordered plasma motions in the solar corona is presented. Velocities in quiet coronal regions, coronal loops, coronal holes, and cavities around quiescent prominences are analyzed. Data based on interferometric observations of several total solar eclipses obtained earlier by the authors and in addition the values of turbulent velocities resulting from revising the 5303 line profiles were used. Published data based both on ground and space observations in visual and far ultraviolet (UV) spectral region are collected. The turbulent velocities in quiet loop structures and diffuse quiet corona seem to be similar, and the coronal plasma in the vicinity of the quiet protuberances is less turbulent than in the quiet corona or in the coronal holes. Velocities of directed motions for different structures in the corona are examined. It seems that the turbulent velocities are comparable by their magnitudes with the direct plasma velocities; however, at the same time they are slightly less.","PeriodicalId":135868,"journal":{"name":"International Journal of Geomagnetism and Aeronomy","volume":"144 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-07-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116433601","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
Indices for the epochs of the solar activity minima 太阳活动极小期的指数
International Journal of Geomagnetism and Aeronomy Pub Date : 2007-07-25 DOI: 10.1029/2006GI000140
A. Tlatov, V. Makarov
{"title":"Indices for the epochs of the solar activity minima","authors":"A. Tlatov, V. Makarov","doi":"10.1029/2006GI000140","DOIUrl":"https://doi.org/10.1029/2006GI000140","url":null,"abstract":"[1] New solar activity indices for the sunspot cycle minima were obtained from the Hα synoptic charts for 1887–2005, Ca II K observational data of the solar disk at Kodaikanal for 1907–1995. The Apz index determines the area of the polar zone occupied by the magnetic field of one polarity, and A(t) is the sum of squares of dipole and octupole magnetic moments. The L(t) index is the total length of magnetic neutral lines on the Hα synoptic chart, and K(t) characterizes the complexity of the topology pattern of the general magnetic field of the Sun. It is determined by the inverse number of crossings of neutral lines with the meridian net on the Hα chart. The R(t) index characterizes the correlation factor of the magnetic field polarities in the latitude zones ±40◦. The solar rotation index SSPD(t) is determined by the sum of the spectral density of the power of the magnetic field sector structures. The area of the Ca II K bright points at high latitudes is the SK(t) index. It has been shown that the 11-year cycles of Apz(t), A(t), L(t), K(t), R(t), SSPD(t), and SK(t) have maxima at the sunspot activity minimum and that they are ahead of the cycles of Wolf numbers, W (t), by 5–6 years.","PeriodicalId":135868,"journal":{"name":"International Journal of Geomagnetism and Aeronomy","volume":"222 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-07-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127525407","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
Peculiarities of X-ray emission of the solar flare on 29 October 2002 2002年10月29日太阳耀斑的x射线发射特性
International Journal of Geomagnetism and Aeronomy Pub Date : 2007-05-11 DOI: 10.1029/2006GI000139
P. Dmitriev, I. Kudryavtsev, V. P. Lazutkov, G. Matveev, M. I. Savchenko, D. V. Skorodumov
{"title":"Peculiarities of X-ray emission of the solar flare on 29 October 2002","authors":"P. Dmitriev, I. Kudryavtsev, V. P. Lazutkov, G. Matveev, M. I. Savchenko, D. V. Skorodumov","doi":"10.1029/2006GI000139","DOIUrl":"https://doi.org/10.1029/2006GI000139","url":null,"abstract":"[1] Time structure of the soft and hard X-ray emission of the solar flare on 29 October 2002 is studied. The flare began at 2148:49 UT and was measured by the IRIS spectrometer on board the CORONAS-F spacecraft. High sensitivity of the device made it possible to detect in the flare X-ray emission a pulse structure with timescale of the order of tens of milliseconds. Similarly, spike structure was observed on board of Compton Gamma Ray Observatory. A quasiperiodic structure with a magnitude of the order of 10 s was revealed by means of spectral time analysis. This structure can be explained by magnetohydrodynamic sausage-mode oscillations generated in the flare loop with the characteristic parameters of the plasma of the coronal region of the solar atmosphere. The evolution of the energetic spectrum of the hard X-ray emission of this flare with the resolution of 1 s during the entire event is studied.","PeriodicalId":135868,"journal":{"name":"International Journal of Geomagnetism and Aeronomy","volume":"78 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-05-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130067268","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
Oblique chirp sounding and modeling of ionospheric HF channel at paths of different length and orientation 电离层高频信道在不同长度和方向路径上的斜向啁啾探测与模拟
International Journal of Geomagnetism and Aeronomy Pub Date : 2007-05-11 DOI: 10.1029/2006GI000143
G. Vertogradov, V. G. Vertogradov, V. P. Uryadov
{"title":"Oblique chirp sounding and modeling of ionospheric HF channel at paths of different length and orientation","authors":"G. Vertogradov, V. G. Vertogradov, V. P. Uryadov","doi":"10.1029/2006GI000143","DOIUrl":"https://doi.org/10.1029/2006GI000143","url":null,"abstract":"[1] The results of systematic observations during 2005 of the main characteristics of HF propagation at a network of paths of oblique linear frequency modulation (LFM) sounding of the ionosphere are presented. The values of the maximum observed frequency (MOF) are calculated using the IRI 2001 model and the effective sunspot number Weff . It is shown that the difference between the predicted and measured monthly mean values does not exceed 12%. It is found that at all propagation paths, quasiperiodic variations of MOF are almost always observed. The amplitude of the MOF variations in the daytime can reach 2 MHz. A spectral analysis of the MOF variations at the midlatitude paths Cyprus– Rostov-on-Don and Inskip–Rostov-on-Don is performed. It is shown that the spectra of the MOF fluctuations have a well-pronounced linear structure. The power of spectral components of MOF fluctuations is concentrated in the 20–90 min range. Analyzing the dynamics of motion of z-type features on a trace of the high-angle ray, the periods of traveling ionospheric disturbances (TID) are determined and found to be 15–30 min. It is found that the TID with such periods correlate well with the sunset and sunrise for the middle point of the path. Modeling of oblique sounding (OS) ionograms at the presence of TID is performed taking into account the procedure of LFM signal processing. On the basis of the comparison of the experimental and calculated data, parameters of middle-scale wave disturbances responsible for the formation of z-type features in OS ionograms are determined.","PeriodicalId":135868,"journal":{"name":"International Journal of Geomagnetism and Aeronomy","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-05-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114168109","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: 11
Influence of internal gravity waves on the reflection of electromagnetic waves from the ionosphere 内部重力波对电离层电磁波反射的影响
International Journal of Geomagnetism and Aeronomy Pub Date : 2007-04-27 DOI: 10.1029/2005GI000131
G. Grigor’ev, T. Zaboronkova, L. Kogan
{"title":"Influence of internal gravity waves on the reflection of electromagnetic waves from the ionosphere","authors":"G. Grigor’ev, T. Zaboronkova, L. Kogan","doi":"10.1029/2005GI000131","DOIUrl":"https://doi.org/10.1029/2005GI000131","url":null,"abstract":"","PeriodicalId":135868,"journal":{"name":"International Journal of Geomagnetism and Aeronomy","volume":"4 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-04-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133334489","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
Relative amplitude of the variations of the total electron content according to the data of the GPS global network 根据GPS全球网络数据，总电子含量变化的相对幅度
International Journal of Geomagnetism and Aeronomy Pub Date : 2007-04-27 DOI: 10.1029/2005GI000132
N. P. Perevalova, E. Afraimovich, I. Zhivetiev, E. A. Kosogorov
{"title":"Relative amplitude of the variations of the total electron content according to the data of the GPS global network","authors":"N. P. Perevalova, E. Afraimovich, I. Zhivetiev, E. A. Kosogorov","doi":"10.1029/2005GI000132","DOIUrl":"https://doi.org/10.1029/2005GI000132","url":null,"abstract":"","PeriodicalId":135868,"journal":{"name":"International Journal of Geomagnetism and Aeronomy","volume":"102 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-04-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122977384","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
Influence of supersonic ion clusters on the plasma neutral component 超声速离子团对等离子体中性成分的影响
International Journal of Geomagnetism and Aeronomy Pub Date : 2007-03-31 DOI: 10.1029/2005GI000120
V. Pavlov
{"title":"Influence of supersonic ion clusters on the plasma neutral component","authors":"V. Pavlov","doi":"10.1029/2005GI000120","DOIUrl":"https://doi.org/10.1029/2005GI000120","url":null,"abstract":"","PeriodicalId":135868,"journal":{"name":"International Journal of Geomagnetism and Aeronomy","volume":"7 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-03-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133905075","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
Efficiency of the Earth-ionosphere waveguide excitation by ELF sources located in an anisotropic ionosphere
International Journal of Geomagnetism and Aeronomy Pub Date : 2007-03-31 DOI: 10.1029/2005GI000123
S. Rybachek, M. J. Ponomariev
{"title":"Efficiency of the Earth-ionosphere waveguide excitation by ELF sources located in an anisotropic ionosphere","authors":"S. Rybachek, M. J. Ponomariev","doi":"10.1029/2005GI000123","DOIUrl":"https://doi.org/10.1029/2005GI000123","url":null,"abstract":"[1] This paper is devoted to the problem of excitation of the Earth‐ionosphere waveguide by the sources located in an anisotropic ionosphere. The ELF range where a single-mode representation of the field can be applied is considered. The generalized theorem of reciprocity makes it possible to find the relation between the field components excited in the waveguide by electric and magnetic dipoles of various orientation. At the location of the emitters in the field of applicability of the quasi-longitudinal approximation, this relation is described by simple analytical expressions. Some results of calculations characterizing the eciency of waveguide excitation by horizontal and radial dipoles and applicability of approximate formulae are presented. The dependencies of the eciency parameters on the frequency, latitude, height of the emitter location, and propagation conditions are analyzed. INDEX TERMS: 6964 Radio Science: Radio wave propagation; 2403 Ionosphere: Active experiments; 2471 Ionosphere: Plasma waves and instabilities; KEYWORDS: Earth‐ionosphere waveguide; ELF radiation; lower ionosphere.","PeriodicalId":135868,"journal":{"name":"International Journal of Geomagnetism and Aeronomy","volume":"20 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-03-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130608128","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
Discussion paper: The eigen oscillations of the solar active regions 讨论文件:太阳活动区的本征振荡
International Journal of Geomagnetism and Aeronomy Pub Date : 2007-02-24 DOI: 10.1029/2006GI000146
B. Mikhalyaev
{"title":"Discussion paper: The eigen oscillations of the solar active regions","authors":"B. Mikhalyaev","doi":"10.1029/2006GI000146","DOIUrl":"https://doi.org/10.1029/2006GI000146","url":null,"abstract":"[1] The standing MHD-waves in the potential magnetic arcades describing the bipolar active regions are investigated. The eikonal method allows us the analytical study of the short waves which are divided into the Alfven and magnetosonic waves. The eigen modes of the magnetic arcades are formed as a result of their reflection from the photosphere. The Alfven mode oscillations of the certain frequency take place on the magnetic surfaces. The fast mode oscillations also take place on some surfaces but they are not magnetic. Each oscillation surface has a discrete set of the eigen frequencies.","PeriodicalId":135868,"journal":{"name":"International Journal of Geomagnetism and Aeronomy","volume":"55 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-02-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130037666","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
Propagation of a radio wave pulse in cold plasma 无线电波脉冲在冷等离子体中的传播
International Journal of Geomagnetism and Aeronomy Pub Date : 2007-02-24 DOI: 10.1029/2005GI000110
G. M. Strelkov
{"title":"Propagation of a radio wave pulse in cold plasma","authors":"G. M. Strelkov","doi":"10.1029/2005GI000110","DOIUrl":"https://doi.org/10.1029/2005GI000110","url":null,"abstract":"[1] A solution to the problem of propagation of a radio wave pulse in isotropic and gyrotropic cold collisional plasmas has been found. The solution is not based on calculation of the Fourier integral and provides an analytical description of the spatial-temporal evolution of characteristics of radio wave pulses with an initial envelope of a rather general form, including pulses with a linear frequency modulation. Expressions for the velocity of propagation of radio wave pulses in isotropic and gyrotropic plasmas have been obtained in the explicit form.","PeriodicalId":135868,"journal":{"name":"International Journal of Geomagnetism and Aeronomy","volume":"22 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-02-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124579626","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
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