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中国科学院地质与地球物理研究所第11届（2011年度）学术年会

作者： Vladimir I.Kurkin nelya m.polekh Chien-Chih Lee Institute of Solar-Terrestrial Physics Russian Academy of Sciences IrkutskRussia General Education Center Ching-Yun University JhungliTaiwan

[1]A critical question in ionospheric physics is the state of the ionosphere and relevant processes under extreme solar *** solar activity during 2007-2009 is extremely prolonged low,which offers us a unique opportunity to explore this issue. In this study,we collected the global ionosonde measurements of the F layer critical frequency(fF),E layer critical frequency(fE),and F layer virtual height(h’F) and the total electron content(TEC) maps produced by the Jet Propulsion Laboratory,which were retrieved from dual-frequency GPS receivers distributed worldwide,to investigate the ionospheric phenomena during solar minimum of cycle 23/24,particularly the difference in the ionosphere between solar minima of cycle 23/24 and the preceding *** analysis indicates that the moving 1 year mean fF at most ionosonde stations and the global average TEC went to the lowest during cycle 23/24 *** solar cycle differences in fF minima display local time dependence,being more negative during the daytime than at ***,the cycle difference in daytime fF minima is about -0.5 mHz and even reaches to around -1.2 *** contrast,a complex picture presents in global h’F and fE,Evident reduction exists prevailingly in the moving 1 year mean hF at most stations,while no huge differences are detected at several stations.A compelling feature is the increase in fJE at some stations,which requires independent data for further *** analysis indicates that record low fF and low TEC can be explained principally in terms of the decline in solar extreme ultraviolet irradiance recorded by SOHO/SEm,which suggests low solar EUV being the prevailing contributor to the unusual low electron density in the ionosphere during cycle 23/24 *** also verifies that a quadratic fitting still reasonably captures the solar variability of fF and global average TEC at such low solar activity levels.

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Ionospheric Effects of Geomagnetic Storms in Different Longitude Sectors

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空间科学学报 2005年第5期25卷 468-473页

作者： G.A.Zherebtsov O.m.Pirog N.m.polekh Institute of Solar-Terrestrial Physics Russian Academy of Sciences Irkutsk 664033 RussiaInstitute of Solar-Terrestrial Physics Russian Academy of Sciences Irkutsk 664033 RussiaInstitute of Solar-Terrestrial Physics Russian Academy of Sciences Irkutsk 664033 Russia

This paper analyzes the state of the ionosphere during two geomagnetic storms of a different intensity evolving in different sectors of local time in different seasons. There were used the data from a network of ionospheric stations located in the opposite longitudinal sectors of 80°-150° E and 250°-310° *** analysis has permitted us to conclude that the detected differences in the variations of the disturbances are likely to be determined by the local time difference of the geomagnetic storm development, its intensity and by the different illumination conditions of the ionosphere.

关键词：地球经度地磁电离层

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modelling of Geomagnetic Storm Effects in the Ionosphere of East Asia

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空间科学学报 2005年第5期25卷 478-483页

作者： G.A.Zherebtsov O.m.Pirog N.m.polekh E.B.Romanova A.V.Tashchilin Institute of Solar-Terrestrial Physics Russian Academy of Sciences Irkutsk 664033 RussiaInstitute of Solar-Terrestrial Physics Russian Academy of Sciences Irkutsk 664033 RussiaInstitute of Solar-Terrestrial Physics Russian Academy of Sciences Irkutsk 664033 RussiaInstitute of Solar-Terrestrial Physics Russian Academy of Sciences Irkutsk 664033 RussiaInstitute of Solar-Terrestrial Physics Russian Academy of Sciences Irkutsk 664033 Russia

This paper presents simulated results of the ionospheric behavior during few geomagnetic storms,which were occurred in the different seasons. The numerical model for ionosphere-plasmasphere coupling was used to interpret the observed variation of ionosphere structure. Reasons why the positive storms are dominant in the winter whereas the negative ones are dominant in the summer season present the special interest for the mid-latitude ionosphere. A theoretical analysis of the processes controlling the ionospheric response to the geomagnetic storms has showed a good agreement between the simulated results and measurements, as well as the crucial role of the neutral composition variations to fit the calculated and the observed ionospheric parameters.

关键词：电离层地磁东亚地区数值模拟电子容量

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Response of the Ionospheric F_2-region Over Irkutsk and Hainan to Strong Geomagnetic Storms

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空间科学学报 2013年第5期33卷 494-500页

作者： E B Romanova G A Zherebtsov K G Ratovsky N m.polekh J K Shi X Wang G J Wang Institute of Solar-Terrestrial Physics Siberian BranchRussian Academy of Sciences State Key Laboratory of Space Weather Center for Space Science and Applied ResearchChinese Academy of Sciences

The ionospheric responses to two strong storms on 17-19 August 2003 and 22-23 January 2004 are studied,using the data from Irkutsk(52.5°N,104°E) and Hainan(19.5°N,109°E) ionospheric *** analysis of variations in relative deviations of the critical frequency △f_0F_2 revealed that at middle latitudes(Irkutsk) negative disturbances were observed in the summer ionosphere; positive and negative ones,in the winter ionosphere during the main and recovery phases *** low latitudes(Hainan),the disturbances were positive in all the cases considered. mechanisms of the disturbances were analyzed with the aid of empirical models of the neutral atmosphere NRLmSISE-00 and thermospheric wind *** main factors determining △f_0F_2 variations at middle latitudes during the storms were demonstrated to be the disturbed equatorward thermospheric wind transporting the disturbed atmospheric composition,the increase in the atomic oxygen concentration,and the passage of internal gravity *** low latitudes,the effects associated with neutral composition variations are less significant than those of the thermospheric wind and electric fields.

关键词： Ionosphere Geomagnetic storm Thermospheric wind Drift

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IONOSPHERIC DISTURBANCES DURING GEOACTIVE PERIODS ON OCTOBER-NOVEmBER,2003 AND NOVEmBER,2004

IONOSPHERIC DISTURBANCES DURING GEOACTIVE PERIODS ON OCTOBER...

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第十一届全国日地空间物理学术讨论会

作者： G.A.Zherebtsov N.m.polekh O.m.Pirog V.I.Kurkin Institute of Solar-Terrestrial Physics SB RAS 126 Lermontov Street IrkutskRussia 664033 Institute of Solar-Terrestrial Physics SB RAS 126 Lermontov Street IrkutskRussia 664033 Institute of Solar-Terrestrial Physics SB RAS 126 Lermontov Street IrkutskRussia 664033 Institute of Solar-Terrestrial Physics SB RAS 126 Lermontov Street IrkutskRussia 664033

＜正＞Investigation of influence of solar and interplanetary events upon the Earth’s magnetosphere and ionosphere is the most important problem of solar-terrestrial physics. Despite the fact that a large amount of experimental and theoretical data has been accumulated to this moment there are the definite complications in prediction of solar activity effects in the ionosphere. In the present solar cycle October and November 2003 are characterized by the unusually high solar activity. Within a year this situation is repeated on November 2004. The activity of last event is less one observed in 2003 （three solar flashes of class X against eleven flashes and the geomagnetic storm with Dst=-383 nT against the geomagnetic storm with Dst=-401 nT）. However it also can be related by the greatest event not only in the present 23-th solar cycle, but in all period of space observations as well. The ionospheric storm is a complex set of phenomena, which arises as a response to a disturbance of the geospace during magnetospheric storms, and depends on both parameters of interplanetary magnetic field and intensity storm and the coordinates and local time of the observation. In this study we present the results of coordinated ionosphere observations in the Russian-Chinese network during these geoactive periods 2003-2004. For comparison we have also used the data from some stations of the western hemisphere and the measurements from the Irkutsk incoherent scatter radar. It is shown that the periods of total absorption and the blanketing Es layer at the high latitudes and the extended negative disturbances at the middle latitudes typical for geomagnetic storms such intensity were observed in both hemispheres in 2003 and 2004. The first phenomenon were determined by the precipitating auroral particle fluxes, the negative disturbance in F- layer are usually bounded with the change of circulation system and gas content of neutral atmosphere, mainly decreasing of relation [O]/[N2]. Besides

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VARIATION OF IONOSPHERIC PARAmETERS IN QUIET AND DISTURBED CONDITIONS IN THE EAST ASIA:OBSERVATION AND mODELING

VARIATION OF IONOSPHERIC PARAMETERS IN QUIET AND DISTURBED C...

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第十一届全国日地空间物理学术讨论会

作者： G.A.Zherebtsov O.m.Pirog N.m.polekh E.B.Romanova A.V.Tashchilin Institute of Solar-Terrestrial Physics SB RAS 126 Lermontov Street IrkutskRussia 664033 Institute of Solar-Terrestrial Physics SB RAS 126 Lermontov Street IrkutskRussia 664033 Institute of Solar-Terrestrial Physics SB RAS 126 Lermontov Street IrkutskRussia 664033 Institute of Solar-Terrestrial Physics SB RAS 126 Lermontov Street IrkutskRussia 664033 Institute of Solar-Terrestrial Physics SB RAS 126 Lermontov Street IrkutskRussia 664033

＜正＞In the frames of collaborate Russian-Chinese project of ionosphere response to magnetic storms research were continued the investigations along meridian in three directions: quiet ionosphere, weak and moderate storms, and great storms （geoactive periods on October-November 2003 and November 2004）. In this study the bulk attention is focused to the difference of ionospheric effects to weak and modern storms in different seasons. We present the results of morphological analysis and numerical modeling during the storms observed in different seasons. Here is received the following conclusion. In the winter at high latitudes the disturbances were positive at night and negative in day. In contrast at middle latitudes the disturbances are negative at night and positive in the day. In the summer the disturbances are mainly negative. At mid latitudes there are observed the small disturbances with amplitude less 10% both positive and negative. In the equinox the disturbance pattern is similar to the winter one, but with smaller amplitude. The numerical model for ionosphere-plasmasphere coupling that was developed at the ISTP SB RAS was used to interpret the observed variation of ionosphere structure. Calculation was carried out with correction of the corresponding empirical models according to the available data of different ground observations. A theoretical analysis of the processes controlling the mid-latitude ionospheric response to the geomagnetic storm showed a good agreement of modeling results and measurements, as well as made it possible to ascertain the crucial role of the neutral composition variations in the ionospheric parameter observed variations. At auroral and subauroral stations the electron density variability during the storm is much more pronounced. According to results of analysis of the ionospheric plasma convection trajectories, this variability is caused by the combined effect of convection and energetic electron precipitation. Neutral thermospheri

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东亚低、中、高纬度地区电离层电子密度参数的年变化和半年变化研究

东亚低、中、高纬度地区电离层电子密度参数的年变化和半年变化研...

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2017中国地球科学联合学术年会

作者：王铮史建魁王国军王霄 G.A.Zherebtsov E.B.Romanova K.G.Ratovsky N.m.polekh 中国科学院国家空间科学中心 Institute of Solar-Terrestrial Physics SB RAS

研究中统计所使用的电离层电子密度数据来自俄罗斯的Norilsk(69.2°N,88.0°E,地磁纬度59.8°N)、Irkutsk(52.4°N,104.3°E,地磁纬度42.5°N)以及中国的Hainan(海南)(19.5°N,109.1°E,地磁纬度9.7°N)台站,分别来自东亚扇区的高纬度... 详细信息

研究中统计所使用的电离层电子密度数据来自俄罗斯的Norilsk(69.2°N,88.0°E,地磁纬度59.8°N)、Irkutsk(52.4°N,104.3°E,地磁纬度42.5°N)以及中国的Hainan(海南)(19.5°N,109.1°E,地磁纬度9.7°N)台站,分别来自东亚扇区的高纬度、中纬度和低纬度区域。数据由DPS-4型数字测高仪探测获得,时间分辨率为15分钟。从人工标定的测高仪频高图中,可

关键词：电离层电子密度太阳活动变化幅度地磁纬度年变化特征低纬度地区高纬度地区

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