摘要
用120°E经度链附近台站电离层垂测资料和一个二维低纬电离层理论模式探讨1995年10月24日日食电离层效应.在日食条件下只考虑日食区计算太阳EUV辐射减少.模式结果显示:(1)日食期间较低高度电离层光食效应显著,电子浓度跟随食分迅速变化,在食甚后浓度减少达到最大。较高高度电离层对日食响应延迟.(2)低纬地区日食日f_0.F_2比控制日低,而h_mF_2比控制日高.在低纬度地区日食带来的影响相对较大·(3)赤道附近h_mF_2食甚后有一突变,出现日食F_1.5层。(4)食甚后海口纬度附近F层受日食影响持久,而f_0F_2在赤道附近出现第2次下降.最后对低纬日食电离层效应的动力学因素进行了初步的讨论.
On October 24, 1995 a total solar eclipse occurred with its path cutting throughthe low latitude region of Asia. In this paper the ionospheric effects of this solareclipse are investigated using a 2-D ionospheric theoretical model. The results arecompared with experimental observations made by six ionosondes along the 120° Emeridian. Only the depression of solar EUV fluxes during the eclipse has been takeninto account in the calculation under the solar eclipse condition. Simulation resultsshow that:(1) DUring the Period of the eclipse the optical eclipse effects are quiteclear at the low altitude of the ionosphere, while the responses to the eclipse are laterand smaller but longer lasting at the high altitude ionosphere; (2) The lower themagnetic latitude, the stronger is the response to the solar eclipse. In low latituderegion the values of f0F2 on the eclipse day are lower comparing with those on thecontrol conditions , while h.F, values are higher. (3) Near the magnetic equator thereis a sharp transition in hm F2 affter the maximum phase, and a solar F1.5 layerappeared, (4) After the maximum Phase the effects of the eclipse lasted longer nearHainan, and a secondary depression occurred over magnetic eqUator. The mechanismsthat may be responsible for eclipse-caused effects are discussed in the paper.
出处
《地球物理学报》
SCIE
EI
CAS
CSCD
北大核心
1999年第3期296-303,共8页
Chinese Journal of Geophysics
基金
国家自然科学青年基金!49804008
关键词
日食
日食电离层效应
低纬电离层
电离层理论模式
Solar eclipse, Ionospheric effects of the solar eclipse, tow latitudeionosphere, Ionospheric theoretical model.