North/South Asymmetry of sc/si Magnetic Variations Observed along the 210゜Magnetic Meridian
North/South Asymmetry of sc/si Magnetic Variations Observed along the 210゜Magnetic Meridian
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沿 210゜磁子午线观测到的 sc/si 磁变化的北/南不对称性
DOI：
10.5636/jgg.48.1333
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发表时间：
1996
期刊：
影响因子：
--
通讯作者：
S. Akasofu
中科院分区：
文献类型：
--
作者：
K. Yumoto;H. Matsuoka;H. Osaki;K. Shiokawa;Y. Tanaka;T. Kitamura;H. Tachihara;M. Shinohara;S. Solovyev;G. Makarov;E. F. Vershinin;A. V. Buzevich;S. L. Manurung;O. Sobari;M. Ruhimat;Sukmadradjat;R. Morris;B. J. Fraser;F. Menk;K. Lynn;D. Cole;J. Kennewell;J. Olson;S. Akasofu
本文分析了210°磁子午线台站的磁场数据，以检验在地面观测到的sc和si的主脉冲中，DL和DP场的哪个分量占主导地位。DL场和DP场分别对应于从磁层顶经磁层到地球表面和经极地电离层到赤道电离层的传递过程。北半球和南半球的不对称的sc和si扰动出现在低纬度和中纬度地区。低纬共轭对（L = 2）观测到的sc和si主脉冲振幅范围。而夏季半球的1.6英寸宽大约是冬季半球的两倍。白天0600-1800时，在叶浦岛（0 = -0.3°）观测到sc和si主脉冲在赤道的增强。这些观测事实可以通过激发DP场驱动的南北双涡型电离层电流的不对称性来解释，即通过激发夏季半球电离层电导率的增强来解释。sc和si相关的DP场通过电离层从极区到赤道的瞬时穿透在sc和si扰动从太阳风区到磁赤道的能量传递中必须起重要作用。
Magnetic field data from the 210° magnetic meridian chain of stations have been analyzed to examine which component of the DL and DP fields dominates main impulses of sc and si observed on the ground. The DL and DP fields correspond to transfer processes from the magnetopause through the magnetosphere to the Earth's surface and through the polar ionosphere into the equatorial ionosphere, respectively. Northern and Southern Hemisphere asymmetry of sc and si disturbances appears at low and middle latitudes. Amplitude ranges of the sc and si main impulses observed at low-latitude conjugate pairs (L = 2. and 1.6) in the summer hemisphere are about twice as wide as those in the winter hemisphere. The equatorial enhancement of sc and si main impulses can be seen at Yap island (o = -0.3 °) during the daytime at 0600-1800 LT. These observational facts can be interpreted by invoking an asymmetry in the Northern and Southern Hemisphere twin-vortex-type ionospheric currents driven by the DP field, i.e., by invoking enhanced ionospheric conductivities in the summer hemisphere. The instantaneous penetration of sc and si-associated DP fields through the ionosphere from the polar region to the equator must play an important role in the energy transfer of sc and si disturbances from the solar-wind region to the magnetic equator.