摘要
基于临潼（34°22＇N，109°13＇E）对来自冲绳（26°36＇N，128°09＇E）的100kHz低频一跳天波的时延及场强的实测，并利用相应的地磁扰动等资料、进行了有关低频天波信号变化与地磁活动的关系的分析研究。结果表明：（1）当地磁扰动的日平均指数较高时，低频天波信号的时延、场强的变化也较为明显;（2）磁暴达主相的当日，低频天波信号的时延、场强大多有明显变化，并且对延、场强的变化还与低频天线反射点处于白天还是夜晚有关，若处于夜晚，天演变化较大。若处于白天，变化较小；（3）在磁暴初相时，低频天波信号的时延、场强无明显的变化；（4）低频一跳天渡时延变化值与磁暴主相最大变幅H值有较好的正相关。
The analyses on the relationship between the variation of LF sky-wave signal and thegeomagnetic activities are conducted based on the data of geomagnetic activities and themeasuremants of the 100kHz one hop sky wave, transmitted from the Y station (26°36'N,128°09'E) of Loran-C North West Pacific Chain and received at Lintong (34°22'N, 109°13'E). The results show that: (1 ) The variations of the time delay and field strength of thelow frequency sky wave signal are usually obvious when the daily average index of the geomagnetic disturbance,AP, is high; (2) On the days when the magnetic storms reach themain phase, the LF sky wave signals mostly changed. Usually, the variations of the signals are larger if the geomagnetic storms reach main phaSe at night, while the those of thesignal are smaIler if the geomagnetic storms reach main phase during daytime; (3) Thereare no obvious changes for the LF sky wave signals during the initial phase of the magmetic storms ; (4)The varlation of the time delay of low frequency one hop sky wave, is positively correlated with the H value, the maximum of the horizontal component of thegeomagnetic field for the main phase of magnetic storm. These results are discussed in thepaper.
出处
《陕西天文台台刊》
CSCD
1997年第6期43-48,共6页
Publications of The Shaanxi Astronomical Observatiory
关键词
地磁活动
磁暴
低频天波
天波信号
Geomagnetic Activity
LF Sky Wave
Geomagnetic Storms
