中低纬度地区电离层foF2在第24个太阳活动周期与太阳活动的关系

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中图分类号：TN011 文献标志码：A 文章编号：2095-2945(2025)14-0016-05

Abstract:BasedonthedailyhourlyobservationdataoffoF2duringthe24thsolaractivitycycle(2O09-2O19)fromthree ionosphericobservationstationsinChina,thefrequencyvariationlawsoftheF2layer(foF2)anditsrelationshipwiththsolar activityidexwerestudied.ItwasfoundthatthedependenceoffoF2onsunspotnumber(R)andsolarradiofluxat10.7cm wavelength(F10.7)isstrongestduringthesolarmidleandweakestduringthesolar highyears.Usingthemutualinformation methodininformationtheory，thelong-termchangetrendsoffoF2,RandF10.7areanalyzed.Theresultsshowthatthesunspot number (R) ismore suitable to describe the long-term trend of foF2 in the 24th solar activity in China.

Keywords: ionosphere;F2 layer;F2 critical frequency;solar activity index;solar activity cycle

电离层是距离地面 60～1000km 的地球高层大气空域，电离层具有相当浓度的自由电子，能使无线电波改变传播速度，极大地影响了短波无线电长距离传输[1]。（剩余8986字）