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magnetic storms in Mercury's magnetosphere

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Science China(Technological Sciences) 2022年第6期65卷 1427-1432页

作者： ZONG QiuGang ZHAO JiuTong LIU JianJun FU SuiYan SUN WeiJie ZHANG Hui LE Guan RANKIN Robert WEI Yong Institute of Space Physics and Applied Technology Peking UniversityBeijing 100871 China Polar Research Institute of China Shanghai 2000136China Department of Climate and Space Sciences and Engineering University of MichiganAnn Arbor 48109USA Geophysical Institute University of Alaska FairbanksFairbanks 99775USA ITM Laboratory Heliophysics Science DivisionNASA Goddard Space Flight CenterGreenbelt 20771USA Department of Physics University of AlbertaEdmonton T6G2R3Canada Institute of Geology and Geophysics Chinese Academy of SciencesBeijing 100029China

We present evidence of geomagnetic storms in Mercury’s magnetosphere based on MESSENGER magnetic field observations made just before the probe impacted the planet.Our findings answer the question of whether geomagnetic storms can occur in other planetary magnetospheres.The interaction of the solar wind with Mercury’s magnetosphere is known to involve flux transfer events in the dayside magnetosphere,plasmoids and flux ropes in the magnetotail,and substorm-like processes,all of which occur morphologically similar to Earth but with significant differences.The significantly weaker magnetic field,smaller magnetosphere,and much faster timescale of processes around Mercury,when compared with Earth,enable charged particles to escape its magnetosphere more efficiently through magnetopause shadowing and direct bombard of the surface.Our analysis of MESSENGER’s data during a coronal mass ejection(CME)proves that,despite these substantial differences,a bifurcated ring current can form in Mercury’s magnetosphere that initiates magnetic storms under strong solar wind driving.

关键词： magnetic storm Mercury magnetosphere ring current

storm-Time Ionospheric Disturbances Monitored by GPS Beacon Measurements

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Wuhan University Journal of Natural Sciences 2001年第3期6卷 687-693页

作者： Pei Xiao hong, Yu Sheng bing, Xu Ji sheng, Ma Shu\|ying College of Electronic Information, Wuhan University, Wuhan 430072,China College of Electronic Information Wuhan University Wuhan China

The Total Electron Content (TEC) during three great storms, from April to August 2000, was collected by means of a GPS receiver located in Jingzhou (30.4° N, 112.2° E). The time-latitude-dependent features of ionospheric storms are identified using TEC difference images based on the deviations of TEC during storm relative to quiet time. The responses of ionospheric TEC to magnetic storms were analyzed. The results show that: 1) In middle and low latitude, ionospheric storms effects are more apparent in local day time than at night: 2) Ionospheric storm effects are more dominant near the hump of the equatorial anomaly region than in other regions of TEC measurements; 3) The positive effects during the main phase of ionospheric storm may be caused by electric fields in low latitude; 4) During the recovery period of ionospheric storm, the negative phase of storm may be due to the perturbation of the neutral gas composition.

关键词： global positioning system ionosphere total electron content magnetic storm ionospheric storm

Large-Scale Traveling Ionospheric Disturbances Observed by GPS Receivers in Antarctica

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Wuhan University Journal of Natural Sciences 2010年第2期15卷 135-142页

作者： MOMANI Mohammad Awad YATIM Baharudin MOHD ALI Mohd Alauddin Institute of Space Science Universiti Kebangsaan Malaysia Bangi 43600 Selangor Malaysia Department of Electrical Electronic and Systems Engineering Faculty of Engineering and Built Environment Universiti Kebangsaan Malaysia Bangi 43600 Selangor Malaysia

The paper examines the propagation direction and velocity of large-scale traveling ionospheric disturbances （LST1Ds） during extreme geomagnetic storms in the 23rd solar cycle （e.g., October 2003 and November 2003 storms） using GPS observations. In the analysis, the time delay between the vertical total electron content （VTEC） structures at Scott Base, McMurdo, Davis and Casey GPS stations and the distance between these stations were the main parameters in the determination of LSTIDs propagation speed and direction. The observations during October and November 2003 storms show obvious time delay between the total electron content （TEC） enhancement signatures at these stations. The time delay suggests a movement of the ionospheric disturbances from higher to lower latitudes during the October storm with a velocity of 800-1 200 m/s and poleward propagation of LSTIDs during the November storm with a ve- locity of 300-400 m/s. The equatorward or poleward expansion of LSTIDs during the October and November 2003 storms is probably caused by the disturbances of the neutral temperature occurring close to the dayside convection throat or by the neutral wind oscillation induced by atmospheric gravity waves （AGW） launched from the aurora region.

关键词： Antarctica GPS ionosphere large-scale traveling iono-spheric disturbance （LSTID） magnetic storm

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地磁暴与电离层骚扰的关系

地球物理学报 1988年第4期31卷 471-477页

作者：黄庆铭中国电波传播研究所河南新乡

一、引言太阳活动区喷发出的粒子流引起太阳风对地球磁场和电离层作用,从而发生地磁暴和电离层骚扰,所以它们的发生是与太阳活动有着密切的关系。但是,在地磁暴期间常常伴随着电离层F;层骚扰,即峰值电子密度相对于中值有大的减少或增... 详细信息

一、引言太阳活动区喷发出的粒子流引起太阳风对地球磁场和电离层作用,从而发生地磁暴和电离层骚扰,所以它们的发生是与太阳活动有着密切的关系。但是,在地磁暴期间常常伴随着电离层F;层骚扰,即峰值电子密度相对于中值有大的减少或增加。早期曾有人提

关键词： Ionospheric disturbance magnetic storm Negative phase Main phase.

Geomagnetic response in high latitudes during the stormon July 15-16,2000

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Geomagnetic response in high latitudes during the stormon Ju...