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Ionospheric Effects of Geomagnetic Storms in Different Longitude Sectors

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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Solar activity variations of the ionospheric peak electron density

Solar activity variations of the ionospheric peak electron d...

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中国科学院地质与地球物理研究所2006学术年会

作者： o.m.pirog V.I.Kurkin Institute of Solar-Terrestrial Physics Russian Academy of SciencesIrkutsk 664033Russia

The daily averaged SEm/SoHo EUV measurements,solar proxies,and foF2 data at 20 ionosonde stations in the East Asia/Australia sector are collected to investigate the solar activity dependences of the ionospheric peak electron density(NmF2).The intensities of solar EUV from the SEm/SoHo measurements from 1996 to 2005 show a nonlinear relationship with F107,and the SEm/SoHo EUV can be better represented by a solar activity factor P=(F107+F107A)/*** and latitudinal dependences are found in the solar activity variation of NmF2 in the East Asia/Australian *** slope of NmF2 with P in the linear segment further shows similar annual variations as the background electron densities at moderate solar *** show a nonlinear dependence of NmF2 on solar EUV(the saturation effect of NmF2 for high solar EUV).Based on a simple model of photochemistry,taking the neutral atmospheric consequences into account,calculations at fixed height simulate the saturation effect of NmF2,but the observed change rate of NmF2 with P are inadequately *** taking into account the influence of dynamics(via a simple model of the solar EUV dependence of the ionospheric height) tend to reproduce the observed change rate of *** indicate that, besides solar EUV changes,the influence of dynamics and the atmospheric consequences should substantially contribute to the solar activity variations of NmF2.

关键词： ionospheric NmF2 solar cycle variation solar EUV radiation

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海南地区电离层漂移对F10.7响应的分析研究

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电波科学学报 2007年第3期22卷 370-374,404页

作者：王霄史建魁武顺智甄卫民陈丽 o.m.pirog G.A.Zherebtsov 中国科学院空间科学与应用研究中心空间天气学国家重点实验室北京100080 中国电波传播研究所山东青岛266071 Institute of Solar-Terrestrial Physics Russian Academy of Sciences

根据海南地区2002年3月～2004年3月期间的电离层等离子体漂移观测数据，分析了东亚低纬地区（海南）电离层等离子体漂移对太阳F10.7指数的响应特性.结果表明：（1）F10.7指数的强弱对垂直漂移速度的影响在春秋季最大，夏季次之，冬季影... 详细信息

根据海南地区2002年3月～2004年3月期间的电离层等离子体漂移观测数据，分析了东亚低纬地区（海南）电离层等离子体漂移对太阳F10.7指数的响应特性.结果表明：（1）F10.7指数的强弱对垂直漂移速度的影响在春秋季最大，夏季次之，冬季影响较小；一天中又以日出日落附近影响最为显著，夜间次之，日间最小.（2）F10.7指数强弱对经向漂移没有显著的影响.（3）晚间东向漂移随F10.7增大而增强，日间F10.7弱时有强的西向漂移.（4）与赤道地区（Jicamarca 站）相比较，东亚低纬度地区电离层漂移对F10.7的响应有着较大的差异.

关键词：太阳活动电离层等离子体漂移

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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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