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Study on geomagnetic effects of the March 9, 1997 solar eclipse in Mohe area, China

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Acta Seismologica Sinica(English Edition) 2002年第1期15卷 74-81页

作者：冯忠孝高金田任熙宪 1. Institute of Geophysics China Seismological Bureau 100081 Beijing China

The geomagnetic effects of the total solar eclipse in Mohe area and the partial eclipse occurred on March 9, 1997 in China are analyzed in this paper. The geomagnetic effects of the eclipse widely distributed in China are obtained, which show H component decreases obviously and is symmetric along the latitude with a center near 33N during the eclipse time. These results of solar eclipse geomagnetic effects are the newest in recent years obtained in the largest area in China.

关键词： solar eclipse geomagnetic effects of eclipse optimum simulation

Tomographic Study of Ionospheric Effects Associated with a solar eclipse

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Wuhan University Journal of Natural Sciences 2003年第02A期8卷 399-404页

作者： Wu Xiong-bin, Xu Ji-sheng, Ma Shu-ying, Tian MaoSchool of Electronic Information, Wuhan University, Wuhan 430072, Hubei, China Wuhan University School of Electronic Information Wuhan Hubei China (GRID:grid.49470.3e) (ISNI:***)

This paper studies the ionospheric effects associated with the solar eclipse of October 24th, 1995 by means of Computerized Ionospheric Tomography (CIT). Since the reconstructed profiles from experimental CIT are sporadically located in time, a time domain interpolation method based on Singular Value Decomposition (SVD) technique is proposed and applied to extract the ionospheric effects. The effects can be extracted by comparison analysis between the interpolated CIT profiles of the eclipse days and that of the reference day that are time-aligned. A series of figs have been obtained showing the attenuation of photonization effect at low altitudes and the weakening of plasma’s transportation process at high altitudes, etc. The photonization effect recovered to normal level soon after the last contact. The maximum electron density diminishing is observed about 2 h after the eclipse maximum and the effects seem vanished in the hours followed. Analysis on vertical TEC’s latitudinal-temporal variation gives similar conclusions.

关键词： ionosphere solar eclipse tomography total electron content international reference ionosphere

Prediction of the thermospheric and ionospheric responses to the 21 June 2020 annular solar eclipse

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Earth and Planetary Physics 2020年第3期4卷 231-237页

作者： Tong Dang JiuHou Lei WenBin Wang MaoDong Yan DeXin Ren FuQing Huang Chinese Academy of Sciences Key Laboratory of Geospace Environment School of Earth and Space SciencesUniversity of Science and Technology of ChinaHefei 230026China Mengcheng National Geophysical Observatory University of Science and Technology of ChinaHefei 230026China Chinese Academy of Sciences Center for Excellence in Comparative Planetology University of Science and Technology of ChinaHefei 230026China High Altitude Observatory National Center for Atmospheric ResearchBoulderCOUSA

On 21 June 2020,an annular solar eclipse will traverse the low latitudes from Africa to Southeast *** highest latitude of the maximum eclipse obscuration is approximately 30°.This low-latitude solar eclipse provides a unique and unprecedented opportunity to explore the impact of the eclipse on the low-latitude ionosphere–thermosphere(I–T)system,especially in the equatorial ionization anomaly *** this study,we describe a quantitative prediction of the impact of this upcoming solar eclipse on the I–T system by using Thermosphere–Ionosphere–Electrodynamics General Circulation Model simulations.A prominent total electron content(TEC)enhancement of around 2 TEC units occurs in the equatorial ionization anomaly region even when this region is still in the shadow of the *** TEC enhancement lasts for nearly 4.5 hours,long after the solar eclipse has *** model control simulations indicate that the TEC increase is mainly caused by the eclipse-induced transequatorial plasma transport associated with northward neutral wind perturbations,which result from eclipse-induced pressure gradient *** results illustrate that the effect of the solar eclipse on the I–T system is not transient and linear but should be considered a dynamically and energetically coupled system.

关键词： solar eclipse ionosphere thermosphere coupling equatorial ionization anomaly model simulation

Ionospheric Responses to a Total solar eclipse Deduced by the GPS Beacon Observations

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Wuhan University Journal of Natural Sciences 1999年第4期4卷 439-444页

作者： CHEN An hua, YU Sheng bing, XU Ji sheng College of Electronic Information, Wuhan University, Wuhan 430072, China Wuhan University College of Electronic Information Wuhan China (GRID:grid.49470.3e) (ISNI:***)

The total electron content (TEC) data during the total eclipse of March 9, 1997 were collected, which were observed by means of nine GPS receivers located at the eastern Asia. The responses of total TEC to the eclipse were analyzed. The results show that: 1) the eclipse led to apparent decrement in TEC that lasted for six to eight hours; 2) the maximum decrement occurred after the middle of the eclipse with time delays varying from twenty minutes to about three hours; 3) the maximum absolute deviations of TEC on the eclipse day do not show a simple and consistent relationship to the maximum solar obscuration.

关键词： solar eclipse ionosphere total electron content GPS beacon

Remote sensing ionospheric variations due to total solar eclipse, using GNSS observations

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Geodesy and Geodynamics 2020年第3期11卷 202-210页

作者： Mohamad Mahdi Alizadeh Harald Schuh Saeed Zare Sahar Sobhkhiz-Miandehi Lung-Chih Tsai Dept.of Geodesy and Geomatics Eng. K.N.Toosi University of TechnologyTehranIran Inst.of Geodesy and Geoinformation Science Technical University of BerlinBerlinGermany Dept.1:Geodesy GFZ German Research Center for GeosciencesPotsdamGermany Center for Space and Remote Sensing Research National Central UniversityChung-LiTaiwanChina GPS Application and Research Center National Central UniversityChung-LiTaiwanChina

For years great interest has been taken in the effects of physical phenomena on ionosphere structure. A total solar eclipse was visible in North America on August 21 st, 2017. This event offered a great opportunity for remote sensing the ionospheric behavior under the eclipse condition. In this study we investigated the effects of total solar eclipse on variations of Total Electron Content(TEC), and consequently deviations on regional models of Vertical TEC(VTEC), as well as variations in ionospheric scintillation occurrence. Although variations of TEC due to total solar eclipse are studied thoroughly by many authors, but the effect of solar eclipse on ionospheric scintillation has never been considered before. Our study is based on measurements from a high-rate GPS network over North America on the day of eclipse, a day before and after its occurrence, on the other hand, GPS measurements from groundbased stations on similar days were used to model TEC on the day of event, and also one day before and after it. The results of this study demonstrate that solar eclipse reduced scintillation occurrence at the totality region up to 28 percent and TEC values showed a decrease of maximum 7 TECU. Considering TEC models, our study showed apparent variations in the regional models, which confirms previous studies on ionospheric responses to eclipse as well as theoretical assumptions.

关键词： Ionosphere solar eclipse Remote sensing Ionospheric scintillation Total electron content GPS measurements

Observations of the solar corona during the total solar eclipse on 21 August 2017

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Earth and Planetary Physics 2017年第1期1卷 68-71页

作者： Hui Tian ZhongQuan Qu YaJie Chen LinHua Deng ZhengHua Huang Hao Li Yue Zhong Yu Liang JingWen Zhang YiGong Zhang BaoLi Lun XiangMing Cheng XiaoLi Yan ZhiKe Xue YuXin Xin ZhiMing Song YingJie Zhu Tanmoy Samanta School of Earth and Space Sciences Peking University Yunnan Observatories Chinese Academy of Sciences Shandong Provincial Key Laboratory of Optical Astronomy and solar-Terrestrial Environment Institute of Space Sciences Shandong University

The Sun’s tenuous outer atmosphere,the corona,emits only about one-millionth as much light as the solar *** ancient times the corona was observed by human beings only during total solar eclipses,when the strong emiss... 详细信息

关键词： solar corona solar eclipse solar magnetic fields coronal heating

Monitoring the geospace response to the Great American solar eclipse on 21 August 2017

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Earth and Planetary Physics 2017年第1期1卷 72-76页

作者： Shun-Rong Zhang Philip J.Erickson Larisa P.Goncharenko Anthea J.Coster Nathaniel A.Frissell Haystack Observatory Massachusetts Institute of Technology Center for solar-Terrestrial Research New Jersey Institute of Technology

Since ancient times,solar eclipses have fascinated—and sometimes terrified—*** eclipses are direct sensory *** the sun vanishes from the sky,birds fall silent during the midday *** instrumentation has enabled resear... 详细信息

关键词： solar eclipse geospace effect ionospheric observations ionospheric radio citizen science

Comment on the paper“Total solar eclipse of July 22,2009:Its impact on the total electron content and ionospheric electron density in the Indian zone”by Sharma et al.

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Comment on the paper“Total solar eclipse of July 22,2009:It...

Thales of Miletus, Archimedes and the solar eclipses on the Antikythera Mechanism

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： Huijun Le~*,Libo Liu,Yiding Chen Beijing National Observatory of Space Environment,Institute of Geology and Geophysics,Chinese Academy of Sciences,Beijing,China

By analyzing COSMIC data,Sharma et al.(2010) found more than 50%reduction in electron density during a solar eclipse at the F2-layer and above,with the peak of 0%at 370 *** great eclipse effect on topside ionosphere was very abnormal and much different from previous ***,by comparing the cosmic data with IRI results,we find that the abnormal reduction comes mainly from the significant local time variation at sunrise,not from the eclipse ***,we simulated the eclipse effect by using a theoretical model to confirm our analysis.

关键词： solar eclipse Equatorial ionosphere IRI model Numerical simulation

来源： cnki会议评论

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Journal of Earth Science and Engineering 2014年第12期4卷 757-769页

作者： G6ran Henriksson Department of Physics and Astronomy Uppsala University Uppsala SE 751 20 Sweden

Thales of Miletus （640？-546 BC） is famous for his prediction of the total solar eclipse in 585 BC. In this paper, the author demonstrate how Thales may have used the same principle for prediction of solar eclipses as that used on the Antikythera Mechanism. At the SEAC conference in Alexandria in 2009, the author presented the paper ＂Ten solar eclipses show that the Antikythera Mechanism was constructed for use on Sicily.＂ The best defined series of exeligmos cycles started in 243 BC during the lifetime of Archimedes （287-212 BC） from Syracuse. The inscriptions on the Antikythera Mechanism were made in 100-150 BC and the last useful exeligmos started in 134 BC. The theory for the motion of the moon was from Hipparchus （ca 190-125 BC）. A more complete investigation of the solar eclipses on the Antikythera Mechanism reveals that the first month in the first saros cycle started with the first new moon after the winter solstice in 542 BC. Four solar eclipses 537-528 BC, from the first saros cycle, and three one exeligmos cycle later, 487-478 BC, are preserved and may have been recorded in Croton by Pythagoras （ca 575-495 BC） and his school.

关键词： solar eclipse exeligmos cycle saros cycle seasonal hour equinoctial hour.