太阳活动对赤道电离层闪烁影响的初步研究

利用赤道地区瓦尼莫(Vanimo)站太阳活动高年到低年(2000-2009) L波段电离层闪烁数据,分析了闪烁随太阳活动从高年到低年的形态特征,统计研究了太阳黑子数与闪烁发生率相关性,并初步探讨了太阳活动影响闪烁的机制。统计研究结果表明:太阳活动中、高年期间,闪烁发生率有明显的季节、月、地方时变化规律;低年闪烁表现平静,以弱闪烁为主,且无明显规律;太阳黑子对闪烁发生率表现出一定调制作用,随着黑子数从高年到低年的减少,闪烁发生率呈下降趋势,中、强闪烁表现的更为突出。说明太阳活动对中、强闪烁的影响比弱闪烁更明显,但其影响机制仍须大量统计分析和理论研究的进一步揭示。

Preliminary research on the influence of the solar activity on ionospheric scintillation over equatorial region

Using the observation data(2000-2009) at Vanimo sation,a morphological analysis for L-band ionospheric scintillations over equatorial region from the solar maximum to the minimum is performed,and the influence mechanism of the solar activity on scintillation is analyzed.The main results are as follows.The seasonal,monthly and local time characteristics of scintillation in the medium and high solar activity periods are present.But in quiet solar activity period,the scintillation activity is mainly weak,and with no obvious disciplines.Furthermore,when the sunspot number decreases,the scintillation incidence descends with the same trend,the scintillation has a good relativity with the sunspot number,especially for the middle and strong scintillation.It shows that the solar activity influences on the middle and strong scintillations are more fierce than the weak,but it needs more researches to certify.