The Millstone Hill ionospheric model and its application to the May 26–27, 1990, ionospheric storm
The Millstone Hill ionospheric model and its application to the May 26–27, 1990, ionospheric storm
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DOI：
10.1029/1999ja900250
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发表时间：
1999-10
影响因子：
--
通讯作者：
A. Schlesier;M. Buonsanto
中科院分区：
文献类型：
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作者：
A. Schlesier;M. Buonsanto
本文概述了Millstone Hill电离层模型，该模型求解了O +（4S）、O + 2、NO +和N +的连续性方程和动量方程，并假定在电离层下限（120 km）处存在光化学平衡，用于估算N + 2离子浓度和O +亚稳态。模型的输入是Millstone Hill非相干散射雷达测量的离子漂移、电子温度和离子温度、质谱仪非相干散射1986（MSIS-86）中性大气、在上边界（500 km）处观察到的电子密度和NO的经验模型。二次光电子碰撞电离模型。Millstone Hill电离层模式被用来模拟1990年5月26-27日的电离层暴，Buonsanto [1995 a]曾对该电离层暴进行过研究。这场风暴的主要特征是在米尔斯顿山上空观测到F区电子密度的大幅增强，即所谓的黄昏效应。结果表明，电场和高度变化的中性风与旅行大气扰动的影响在所观察到的黄昏效应的形成中起着至关重要的作用。来自南方的高密度等离子体的平流显然也有贡献。振动激发的N 2和O 2被认为是重要的，在模拟电子密度在这些扰动夏季太阳活动最大的条件。它没有被发现有必要改变MSIS-86中性密度，以实现良好的协议之间的观测和计算N m F2和H m F2。
The present study gives an overview of the Millstone Hill ionospheric model, which solves continuity and momentum equations for O + ( 4 S), O + 2 , NO + , and N + , Photochemical equilibrium is assumed at the lower boundary (120km in the present study) and for estimation of the ion concentrations of N + 2 and the metastable states of O + . Inputs to the model are the ion drifts, electron temperatures, and ion temperatures measured by the Millstone Hill incoherent scatter radar, the Mass Spectrometer Incoherent Scatter 1986 (MSIS-86) neutral atmosphere, the observed electron density at the upper boundary (500km), and an empirical model for NO. The model is extremely flexible in selection of sets of cross sections, EUV flux models, and models for ionization by secondary photoelectron impact. The Millstone Hill ionospheric model is used to simulate the May 26-27, 1990, ionospheric storm, which has been previously studied by Buonsanto [1995a]. The main feature of this storm is an observed large enhancement in the F region electron density above Millstone Hill, the so-called dusk effect. Results show that the effects of the electric fields and height variations in the neutral wind associated with a traveling atmospheric disturbance played a crucial role in the formation of the observed dusk effect. Advection of higher-density plasma from the south apparently also contributed. Vibrationally excited N 2 and O 2 are found to be important in simulating the electron density during these disturbed summer solar maximum conditions. It has not been found necessary to change the MSIS-86 neutral density in order to bring about good agreement between the observed and calculated N m F 2 and H m F 2 .