North-south asymmetry of the equatorial ionospheric anomaly observed in East Asia during the SUNDIAL-87 campaign
North-south asymmetry of the equatorial ionospheric anomaly observed in East Asia during the SUNDIAL-87 campaign
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DOI：
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发表时间：
1991-06
影响因子：
1.9
通讯作者：
G. Walker;T. Li;J. Soegijo;T. Kikuchi;Y. N. Huang;V. Badillo;E. Szuszczewicz
中科院分区：
文献类型：
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作者：
G. Walker;T. Li;J. Soegijo;T. Kikuchi;Y. N. Huang;V. Badillo;E. Szuszczewicz
利用1987年5月29日至6月7日在东亚电离层探空仪系列站（东经120 °）上获得的f0 F2和hpF 2 /h 'F2结果，研究了赤道电离层异常（EIA）的不对称性。主要的每日特征是：（1）上午EIA南部（冬季）波峰的建立更快，（2）同一波峰的衰减更快，从下午三点开始，比北方波峰更快。这些观测结果已被解释为白天夏季-冬季半球定向风的影响。一般来说，国际参考电离层（IRI）的预测和在香港和万隆的EIA波峰附近的观测结果之间有很好的一致性。EIA波峰的逐日变化归因于（1）影响EIA扩散过程和两个波峰的白天、赤道、向东电场的变化和（2）清晨或日落后沿磁场线的局部扩散，这可能只影响一个波峰
The asymmetry of the equatorial ionospheric anomaly (EIA) has been investigated using f 0 F 2 and h p F 2 /h'F 2 results obtained at a chain of East Asian ionosonde stations (at longitude ∼120 o E) during the SUNDIAL-87 campaign, 29 May-7 June 1987. Predominant daily features were (1) a more rapid build-up of the southern (winter) EIA crest in the morning and (2) more rapid decay of this same crest, starting in the mid-afternoon, than the northern crest. These observations have been explained by the effect of the daytime summer-winter hemisphere directed winds. In general, there was good agreement between International Reference Ionosphere (IRI) predictions and the observed results near the EIA crests at Hong Kong and Bandung. Day-to-day variability of the EIA crest is attributed to (1) variability in the daytime, equatorial, eastward electric field which affects the EIA diffusion process and both crests and (2) localised diffusion down magnetic field lines in the early morning or after sunset which may affect only one crest