磁暴对低纬电离层和低纬哨声的影响

磁暴对低纬电离层和低纬哨声的影响 EFFECT OF MAGNETIC STORMS ON THE LOW-LATITUDE IONOSPHERE AND LOW-LATITUDE-WHISTLERS 保宗悌 Bao Zongti Wu Xiangyang Yu Shaohua Wu Sifang Chen Hanlin 1 first-author 吴向阳 1 余少华 1 吴四芳 1 陈汉林 1 武汉大学空间物理与电子信息学系 武汉大学空间物理与电子信息学系 Department of Space Physics and Electronic Information,Wuhan University Department of Space Physics and Electronic Information,Wuhan University 总结在低纬（包括赤道异常区）地区多年观测到的磁暴期间哨声的出现特征和其他有别于磁静日的特征.联系低纬夜间 F 层在磁暴期间出现的电离层垂直漂移运动特征,用数值模拟计算在磁暴期间出现增强的东西向电场时的低纬 F 层夜间动力学特征,同时用全波解计算夜间哨声波束在电离层底部的透射与反射特性.较好地解释了磁暴期间出现的多跳扩展哨声现象. A close examination is made of the characteristics of whistlers observed at low-latitude stations during magnetic storm. It shows that an increase of whistler activity and tile diffuseness increased on the echoes during the storms. The rate of whistlers oceurence increased considerably and the dispersion Values of the whistlers increased. The echoes of the whistlers （three-hop, five-hop, sometimes seven-hop） have been recorded at the station located at the northern side in the region of equatorial anomaly. The diffuseness of the echoes lasted for 1～3 days. The intensity of the diffuse whistlers is strongest at 3～5 kHz for the three-hop echo and at 2～4 kHz for the five-hop echo. Numerical results about dynamic features of the low-latitude ionospheric F layer in the magnetic storm night are presented. The penetration and reflection of whistler beam in the bottom of the ionosphere are also analyzed by the full-wave method. It is shown that the multi-hop diffuse whistler echoes we received during the storms may be related to the formation of field--aligned irregularities in the equatorial ionosphere with a life time of several hours. 磁暴 低纬电离层 低纬哨声 多跳扩展哨声 magnetic storm low-latitude ionosphere low-latitude whistler multi-hop diffuse whistler P352.4;P352.6 国家自然科学基金(61672102);国家教委博士点基金资助的课题 1993-06-01 2021-04-01 6