南极中山站地磁脉动的观测分析

本文分析的是１９９２年２月９日至１９９３年２月９日在南极中山站记录的各种地磁脉动的观测资料，并对各种地磁脉动的激发机制进行了初步讨论。通过南极中山站地磁脉动观测资料分析，了解高纬地区地磁脉动的形态特征，对南极极隙区高空大气电磁环境、太阳风和磁层相互作用等现象有进一步的认识。     

南极长城站Pi2地磁脉动特征

对南极长城站在１９９０年８月１６日至１９９０年１１月２０日的Ｐｉ２地磁脉动事件进行了分析研究，初步了解了南极长城站Ｐｉ２脉动的频次特征、频率特性和偏振特性，并对南极长城站Ｐｉ２脉动的激发机制做了一些理论探讨．     

The characteristics of Pi2 pulsations at Zhongshan Station of Antarctica

In this paper Pi2 pulsations at Zhongshan Station of Antarctica are analyzed from October 1 - 31, 1996. Their characteristics e. g. occurrence frequency,frequency, and polarization are studied. The characteristics of Pi2 pulsations are summerized as follows: (1 ) Pi2 pulsations at Zhongshan Station usually take place from 2000 MLT to 0200 MLT; the main frequencies are between 6. 79 mHz and 13. 58mHZ; (2 ) Pi2 pulsations with low frequencies are dominent. The range of main frequencies becomes narrow at midnight; (3) The Polarization of Pi2 pulsations are almost linear; (4) About the orientation of major axes the NW-SE direction is dominent before 2200 MLT and NE-SW is dominent after 2200 MLT. The generation mechanism of Pi2 pulsations at Zhongshan Station is discussed theoretically.     

1991年3月24日磁暴期间南极地区地磁脉动的分析

重点分析了1991年3月24日在南极中山站和长城站观测到的丰富的地磁脉动现象,给出了各种地磁脉动发生的时间和主要特征,并对两站各种地磁脉动做了比较分析．这不仅可以认识磁暴期间南极地区向日面与背日面、高纬与中纬地磁脉动的不同表现,也帮助我们了解南极地区磁暴期间地磁脉动形态和磁暴过程的关系。     

低纬Pc3地磁脉动的东西方向传播特性

１９９６年１０月１０日至１１月２９日在地磁北纬２９．６°附近（Ｌ＝１．３）的喀什、安西和北京,沿东西方向建立了横跨４０．２°地理经度的地磁脉动观测台链．根据观测数据,分析研究了低纬Ｐｃ３脉动东西方向的传播特性和偏振特性．结论是上午以向西传播为主,下午以向东传播为主．白天偏振椭圆主轴方位方向以ＮＷ－ＳＥ为主,偏振方向以右旋为主．     

Digital filter technology and itsapplication to geomagnetic pulsations in Antarctica

Digital filter technology isan importantmethod in study of geomagnetic pul- sations in Antarctica.The signals received by pulsation magnetometer on the ground include varioustypesofmagnetic pulsations.Some types of pulsations or some frequen- cy bands of pulsations can be extracted from the signals by means of digital filter tech- nology because types of pulsations are defined according to their frequency range.In this paper usual digital filter technology is provided for study of magnetic pulsations in Antarctica and some examples are introduced.     

Propagation and source of Pc5 frequency range pulsation at cusp latitude

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南极中山站Pc3地磁脉动特征

根据1992年2月9日军1993年2月9日南极中山站地磁脉动观测资料,选出Pc3脉动事件进行分析研究,重点研究南极中山站Pc3脉动的出现频次、频率特性和振幅特性,并对南极中山站记录的Pc3脉动的激发和传播机制进行理论研究.     

Propagation and source of Pc5 frequency range pulsation at cusp latitude

Two induction magnetometers have been installed at Chinese Zhongshan Station and Australia Davis Station, Antarctica respectively. We adopt the cross spectral analysis technique to analyze the data of the two induction magnetometers, in June, September, December 1996 and March 1997, and to investigate Pc5 frequency range pulsation (150 600 s) occurrence and propagation in cusp latitude. The results are summarized as follows: At Zhongshan Davis Station, the magnetic pulsations in Pc5 frequency band can occurs over a wide time, but more frequently at pre local magnetic noon and pre local magnetic midnight. The Pc5 pulsations have no significant seasonal variation in the amplitude, occurrence and propagation. The amplitude has a small peak at pre local magnetic noon and large value sometimes at pre local magnetic midnight. In daytime, the Pc5 pulsations propagate westward in morning and eastward in afternoon, and reversal at local magnetic noon. In nighttime, the Pc5 pulsations propagate westward before 20:00 MLT and eastward after 20:00 MLT. Near dusk time, the Pc5 pulsations propagate irregularly. These characteristics indicate that the Pc5 pulsations have different source at different local magnetic time.     

关于磁层边界区Kelvin-Helmholtz不稳定性的研究

本文发展了Lee等人在1981年提出的模型,重点强调可压缩等离子体组成的磁层边界区上的K-H不稳定性。在可压缩的条件下,考虑边界层的厚度,我们推出了磁层边界区K-H不稳定性的色散方程。应用数值分析,我们发现磁层边界区上K-H不稳定性的一些新的性质。