Annual and semiannual variations in the ionospheric F2-layer. I. Modelling
Annual and semiannual variations in the ionospheric F2-layer. I. Modelling
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DOI：
10.1007/s00585-000-0927-8
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发表时间：
2000-08
影响因子：
1.9
通讯作者：
L. Zou;H. Rishbeth;I. Müller-Wodarg;Ingo Müller-Wodarg;A. Aylward;G. H. Millward;G. H. Millward
中科院分区：
文献类型：
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作者：
L. Zou;H. Rishbeth;I. Müller-Wodarg;Ingo Müller-Wodarg;A. Aylward;G. H. Millward;G. H. Millward
本文用热层-电离层-等离子体层耦合计算模式（CTIP）对地磁平静条件下F2层电子密度（NmF 2）和高度（hmF 2）的年、季和半年变化进行了比较。与中纬度电离层探测结果比较，CTIP较好地再现了NmF 2的许多观测特征，如在中纬度高纬度的磁极附近经度扇区冬季最大值占优势，在远离磁极的经度扇区和一般低纬度地区的春分最大值，以及在60°N ~ 50°S之间纬度的月变化形式。CTIP还再现了NmF 2在午夜的季节行为和hmF 2的夏季-冬季变化。当前版本的CTIP没有再现F2层的一些特征，这些特征归因于建模中不包括的过程。例如，冬季noonNmF 2最大值在较高的太阳活动，这可能是F2层的损失率在夏季由振动激发的分子氮，和hmF 2的半年变化，这可能是由于潮汐效应增加的结果增加的患病率。一个意想不到的功能的计算分布ofNmF 2是东西半球的差异，这似乎是与地磁场配置。物理讨论保留到Rishbethet al的配套文件中。关键词：大气组成和结构（热层-组成和化学）-电离层（中纬度电离层;建模和预报）
Annual, seasonal and semiannual variations of F2-layer electron density (NmF2) and height (hmF2) have been compared with the coupled thermosphere-ionosphere-plasmasphere computational model (CTIP), for geomagnetically quiet conditions. Compared with results from ionosonde data from midlatitudes, CTIP reproduces quite well many observed features ofNmF2, such as the dominant winter maxima at high midlatitudes in longitude sectors near the magnetic poles, the equinox maxima in sectors remote from the magnetic poles and at lower latitudes generally, and the form of the month-to-month variations at latitudes between about 60°N and 50°S. CTIP also reproduces the seasonal behaviour ofNmF2 at midnight and the summer-winter changes ofhmF2. Some features of the F2-layer, not reproduced by the present version of CTIP, are attributed to processes not included in the modelling. Examples are the increased prevalence of the winter maxima of noonNmF2 at higher solar activity, which may be a consequence of the increase of F2-layer loss rate in summer by vibrationally excited molecular nitrogen, and the semiannual variation inhmF2, which may be due to tidal effects. An unexpected feature of the computed distributions ofNmF2 is an east-west hemisphere difference, which seems to be linked to the geomagnetic field configuration. Physical discussion is reserved to the companion paper by Rishbethet al.Key words:Atmospheric composition and structure (thermosphere-composition and chemistry) - Ionosphere (mid-latitude ionosphere; modelling and forecasting)