{"title":"Influence of the lower region of the enhanced ionization produced by a space nuclear explosion on radio wave propagation","authors":"B. I. Semenov","doi":"10.1029/2003GI000053","DOIUrl":"https://doi.org/10.1029/2003GI000053","url":null,"abstract":"[1] Propagation of radio waves through the region of enhanced (cold) ionization of the ionosphere formed below the ionospheric E layer by the X ray and penetrating radiation of a space nuclear explosion is considered. A method to calculate the field and the main radiophysical effects caused by this region is developed. The method makes it possible to calculate the above indicated effects for a wide range of the equivalents and altitudes of the nuclear charge explosions. Asymptotic formulae are obtained for the attenuation determining the conditions of radio wave propagation through the lower region of the enhanced ionization. The formulae make it possible to estimate the effects with the error not exceeding the error in the initial data on spatial-time distributions of the electron concentration.","PeriodicalId":135868,"journal":{"name":"International Journal of Geomagnetism and Aeronomy","volume":"121 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":"134204216","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}
{"title":"Proton flares and the topology of the magnetic field in the active regions of the Sun","authors":"G. A. Porfir’eva, G. V. Yakunina, A. B. Delone","doi":"10.1029/2004GI000093","DOIUrl":"https://doi.org/10.1029/2004GI000093","url":null,"abstract":"","PeriodicalId":135868,"journal":{"name":"International Journal of Geomagnetism and Aeronomy","volume":"3 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":"134446315","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}
{"title":"Envelope solitons of the giant pulsations (Pg)","authors":"B. Klain, N. Kurazhkovskaya","doi":"10.1029/2004GI000074","DOIUrl":"https://doi.org/10.1029/2004GI000074","url":null,"abstract":"Using the data of the observations at auroral observatory Molodezhnaya (Antarctic,L = 6.3), a similarity is found in the shape of the wave packets amplitudes envelope ofgiant pulsations to solitons. The relation is analyzed between the maximum amplitude (A),the carrier in frequency (f), and the width of wave packets (τ) for 30 cases of observationsof the Pg pulsations having the form of separated wave packets. It is shown that themaximum amplitude of wave packets depends linearly on 1/τ√f. We suggest that some Pgpulsations present nonlinear structures having the properties of solutions.","PeriodicalId":135868,"journal":{"name":"International Journal of Geomagnetism and Aeronomy","volume":"91 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":"124915155","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}
{"title":"Localization of the source of ionospheric disturbance generated during an earthquake","authors":"E. Afraimovich, E. Astafieva, V. V. Kirushkin","doi":"10.1029/2004GI000092","DOIUrl":"https://doi.org/10.1029/2004GI000092","url":null,"abstract":"For the first time a method is developed of localization of the source and determinationof the characteristics of wave disturbances generated during earthquakes. In the methodthe disturbances in the total electron content registered at the GPS receiver network areconsidered as a set of signals of a nonequidistant phased grating of “ionospheric detectors”with known coordinates. As a result of solution of the equation system for the plane andspherical front relative to the measured parameters of the disturbance, the phase velocityof the wave disturbance and also the position and time of switching on of the sourceare determined. It is found that the ionospheric disturbances generated during strongearthquakes have the form of a spherical wave diverging with a velocity of ∼1000 m s","PeriodicalId":135868,"journal":{"name":"International Journal of Geomagnetism and Aeronomy","volume":"16 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":"120913539","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}
{"title":"Indications of long-term changes in the lower thermosphere prevailing zonal wind regime","authors":"E. Kazimirovsky","doi":"10.1029/2004GI000085","DOIUrl":"https://doi.org/10.1029/2004GI000085","url":null,"abstract":"[1] To take a new approach to the lower thermosphere (80‐100 km) long-term behavior, the variations of the dates of the equinoctial rearrangements of the zonal wind circulation were considered. We have evaluated the duration of unstable equinoctial rearrangements periods and duration of rather stable summer and winter circulation periods as well. The identical multiyear radio measurements of the horizontal winds in the lower thermosphere/ionosphere at two midlatitude (52 N) observatories (Irkutsk (Badary Observatory), East Siberia, and Collm, central Europe) during 1981‐1996 were used. It is shown that there are significant nonzonality and regional dierences in the character of the circulation rearrangements. The duration of the winter circulation in East Siberia is systematically longer than in central Europe. However, the tendency to a decrease of the summer circulation duration for the years under consideration is observed for both regions. INDEX TERMS: 0341 Atmospheric Composition and Structure: Middle atmosphere: constituent transport and chemistry; 2437 Ionosphere: Ionospheric dynamics; 2427 Ionosphere: Ionosphere/atmosphere interactions; KEYWORDS: Lower thermosphere/ionosphere; Prevailing wind; Long-term changes.","PeriodicalId":135868,"journal":{"name":"International Journal of Geomagnetism and Aeronomy","volume":"135 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":"131782426","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}