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首页> 外文期刊>Journal of Geophysical Research, A. Space Physics: JGR >Investigating the performance of simplified neutral-ion collisional heating rate in a global IT model
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Investigating the performance of simplified neutral-ion collisional heating rate in a global IT model

机译：调查性能的简化neutral-ion碰撞在全球升温速率它的模型

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摘要

The Joule heating rate has usually been used as an approximate form of the neutral-ion collisional heating rate in the thermospheric energy equation in global thermosphere-ionosphere models. This means that the energy coupling has ignored the energy gained by the ions from collisions with electrons. It was found that the globally averaged thermospheric temperature (T_n) was underestimated in simulations using the Joule heating rate, by about 11% when F_(10.7) = 110 solar flux unit (sfu, 1 sfu = 10~(?22) Wm~(?2) Hz~(?1)) in a quiet geomagnetic condition. The underestimation of T_n was higher at low latitudes than high latitudes, and higher at F region altitudes than at E region altitudes. It was found that adding additional neutral photoelectron heating in a global IT model compensated for the underestimation of T_n using the Joule heating approximation. Adding direct photoelectron heating to the neutrals compensated for the indirect path for the energy that flows from the electrons to the ions then to the neutrals naturally and therefore was an adequate compensation over the dayside. There was a slight dependence of the underestimation of T_n on F_(10.7), such that larger activity levels resulted in a need for more compensation in direct photoelectron heating to the neutrals to make up for the neglected indirect heating through ions and electrons.
机译：焦耳加热率通常被用作的近似形式neutral-ion碰撞升温速率thermospheric能量方程在全球thermosphere-ionosphere模型。意味着能源耦合忽略了获得的能量离子的碰撞电子。平均thermospheric温度(T_n)低估了焦耳在模拟中使用升温速率,约11% f(10.7) = 110时太阳能通量单位(学院、1学院= 10 ~ (? 22)Wm ~ (? 2)1 Hz ~(?))在一个安静的地磁状况。低估T_n较高的低纬度比高纬度和高F海拔地区海拔比E区域。发现添加额外的中性吗光电子加热在全球IT模型补偿T_n使用的低估焦耳加热近似。光电子加热到中性的补偿为间接路径的能量流从电子离子的中性色自然,因此是一个足够了补偿的光面。依赖T_n低估的f(10.7),这样大的活动水平导致需要更多的补偿直接光电子加热的中性色弥补被忽视的间接加热通过离子和电子。

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