中低緯度地區(qū)電離層foF2在第24個(gè)太陽(yáng)活動(dòng)周期與太陽(yáng)活動(dòng)的關(guān)系

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中圖分類號(hào)：TN011 文獻(xiàn)標(biāo)志碼：A 文章編號(hào)：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

電離層是距離地面 60～1000km 的地球高層大氣空域，電離層具有相當(dāng)濃度的自由電子，能使無(wú)線電波改變傳播速度，極大地影響了短波無(wú)線電長(zhǎng)距離傳輸[1]。（剩余8986字）