【作者】 贺长明； 朱岗昆；

【Author】 He Changming Tschu Kangkun (Institute of Geophysics,Chinese Academy of Sciences)

【机构】 中国科学院地球物理研究所；

【摘要】 在中国首次南极考察期间(1984-1985年),我们在长城站使用GM型宽频带哨声接收机进行了哨声和VLF发射的观测.对资料的形态分析表明,哨声活动的两个峰出现在白天地方时17h—20h前后和清晨地方时03h-06 h.哨声的色散值在白天较大,在子夜后较小。对长城站1月23日和26日哨声资料的详细分析显示出,磁暴期间(1月23日)在不同壳层间传播的哨声的色散值明显降低,这意味着壳层间电子浓度的急剧减少,向下的电子通量为1×10~9el/cm~2·s.在磁暴后三天的1月26日,L=2.8-2.9壳层间存在着稳定的电子回填过程.1月20日获得的定向哨声资料表明,哨声的出口点聚集在磁纬48°-52°之间的一个走向北偏东20°-40°,宽约80 km的条带上而不偏离.由此看来,利用长城站的哨声资料来推求L=2-3壳层间电子浓度的时空变化,研究等离子体层与电离层之间的粒子交换过程是很有意义的.更多还原

【Abstract】 During the First Chinese National Antarctic Research Expedition 1984/85,observation on whistler and VLF emission was carried out by using GM type VLF broadband direction-finding receiver.The morphology of whistlers received shows two peaks of whistle activity at 17-20 LT around sunset and at 03-06 LT of the early morning.Whistler dispersion is greater during daytime and less after midnight. Detailed analysis of whistler data of January 23 and 26 at Great Wall Station reveals that the dispersions of whistlers propagating in different shells markedly decreased on the day of geomagnetic storm commencement(January 23).It implies a rapid depletion of the electron in the shells.There is a downward flux ofelectron of 1×10~9 el/cm~2·s.A steady refilling process occured in shells of L = 2.8-2.9 three days after the storm on January 26. Whistler direction-finding data obtained on January 20 show that the exit points of the whistlers are situated in a strip of about 80 km wide whith an azimuthal direction 20°-40°E of N between 48°-52°geomagnetic latitude,and there are no obvious cross L or longitudinal drifts.Whistler data at Great Wall Station are very useful for deducing temporal and spatial variations of electron density in L= 2-3 shells and investigating particle interchange processes between the ionosphere and the plasmasphere.更多还原