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Observation and modelling of the upper atmospheric density and winds and their dependence on the geomagnetic conditions

高层大气密度和风的观测和建模及其对地磁条件的依赖性

基本信息

批准号：
15111139
负责人：
Professor Dr. Hermann Lühr
金额：
--
依托单位：
依托单位国家：
德国
项目类别：
Priority Programmes
财政年份：
2005
资助国家：
德国
起止时间：
2004-12-31 至 2009-12-31
项目状态：
已结题

来源：
https://gepris.dfg.de/gepris/projekt/15111139?language=en
关键词：
Observation modelling upper atmospheric density

项目摘要

The state of the thermosphere and its temperature distribution are influenced by many factors. This level of the atmosphere is nowadays of great importance since all satellites in low-Earth orbit and manned spacecraft are flying at these altitudes. A special characteristic of the upper atmosphere is the ionisation of part of its gaseous particles. While the ionised component has been studied intensively during the past decades, the investigation of the neutral atmosphere has suffered greatly due to the lack of good observations in the thermosphere. This has changed significantly after the launch of the CHAMP satellite. It is generally assumed in models that the thermospheric structure is mainly controlled by the EUV solar flux, and the magnetic activity should play a minor role. Our recent measurements, however, indicate that this is not the case. In this proposal we plan to investigate the importance of the ionosphere-thermosphere coupling for the dynamics of the upper atmosphere at high latitudes. The study will be based on observations from CHAMP and the EISCAT radar facilities. We are focusing on the auroral region, where most of the Joule heating occurs. Our final aim is it to characterize the ionospheric heating mechanism which causes thermospheric density enhancements and drives winds. The roles of solar wind input and EUV solar radiation shall also be identified.

热层的状态及其温度分布受许多因素的影响。这一高度的大气层在当今非常重要，因为近地轨道上的所有卫星和载人航天器都在这一高度飞行。高层大气的一个特点是部分气体粒子的电离。虽然在过去的几十年里对电离成分进行了深入的研究，但由于缺乏对热层的良好观测，对中性大气的研究受到了很大的影响。在CHAMP卫星发射后，这种情况发生了重大变化。在模式中，一般认为热层结构主要受极紫外太阳辐射通量的控制，而磁活动的影响较小。然而，我们最近的测量表明情况并非如此。在这项建议中，我们计划调查的重要性，电离层热层耦合的动力学高层大气在高纬度地区。这项研究将以CHAMP和EISCAT雷达设施的观测为基础。我们关注的是极光区，大部分焦耳加热发生在那里。我们的最终目标是它的特点电离层加热机制，导致热层密度增强和驱动风。还应确定太阳风输入和极紫外太阳辐射的作用。