Two‐day wave coupling of the low‐latitude atmosphere‐ionosphere system
Two‐day wave coupling of the low‐latitude atmosphere‐ionosphere system
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DOI：
10.1029/2005ja011562
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发表时间：
2006-07
影响因子：
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通讯作者：
D. Pancheva;P. Mukhtarov;M. Shepherd;N. Mitchell;D. Fritts;D. Riggin;S. Franke;P. Batista;M. Abdu;I. Batista;B. Clemesha;T. Kikuchi
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文献类型：
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作者：
D. Pancheva;P. Mukhtarov;M. Shepherd;N. Mitchell;D. Fritts;D. Riggin;S. Franke;P. Batista;M. Abdu;I. Batista;B. Clemesha;T. Kikuchi
[1]本文研究了热带MLT区两日波驱动下低纬大气-电离层系统的垂直耦合。这个问题是从观察的角度来研究的。分析了三种不同类型的数据，以检测和提取2日波信号。在2002年12月1日至2003年2月28日期间的两天波事件被确定在中性风雷达测量位于四个热带站。从位于低纬度的23个磁力计和7个电离层探测站的数据中检测到电离层电流（通过地磁场的扰动记录）和F区电子密度的两天变化。详细研究了每种波的两个特征：波幅随时间的变化和纬向波数随时间的变化。结果表明，在电离层电流和F区等离子体中出现的向西传播的纬向波数为2的全球2日波是由MLT区同时发生的2日波活动所强迫的。这种大气-电离层耦合的主要强迫因子似乎是调制潮汐，特别是半日潮。这种潮汐有一个更大的垂直波长比昼夜潮汐和传播到热层。似乎受到影响的参数，从而驱动观测到的电离层的2天波响应，是发电机电场。
[1] Vertical coupling in the low-latitude atmosphere-ionosphere system driven by the 2-day wave in the tropical MLT region has been investigated. The problem is studied from an observational point of view. Three different types of data were analyzed in order to detect and extract the 2-day wave signals. The 2-day wave event during the period from 1 December 2002 to 28 February 2003 was identified in the neutral winds by radar measurements located at four tropical stations. The 2-day variations in the ionospheric electric currents (registered by perturbations in the geomagnetic field) and in the F-region electron densities were detected in the data from 23 magnetometer and seven ionosonde stations situated at low latitudes. Two features for each kind of wave were investigated in detail: the variation with time of the wave amplitude and the zonal wave number. The results show that the westward propagating global 2-day wave with zonal wave number 2 seen in the ionospheric currents and in F-region plasma is forced by the simultaneous 2-day wave activity in the MLT region. The main forcing agent in this atmosphere-ionosphere coupling seems to be the modulated tides, particularly the semidiurnal tide. This tide has a larger vertical wavelength than the diurnal tide and propagates well into the thermosphere. The parameter that appears to be affected, and thus drives the observed 2-day wave response of the ionosphere, is the dynamo electric field.