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Annales Geophysicae An interactive open-access journal of the European Geosciences Union
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Discussion papers
https://doi.org/10.5194/angeo-2019-10
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/angeo-2019-10
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.

Submitted as: regular paper 05 Mar 2019

Submitted as: regular paper | 05 Mar 2019

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This discussion paper is a preprint. A revision of the manuscript is under review for the journal Annales Geophysicae (ANGEO).

The research on small-scale structures of ice particle density and electron density in the mesopause region

Ruihuan Tian1,2, Jian Wu2, Jinxiu Ma3, Yonggan Liang1,2, Hui Li1,2, Chengxun Yuan1,4, Yongyuan Jiang1, and Zhongxiang Zhou1,4 Ruihuan Tian et al.
  • 1Department of Physics, Harbin Institute of Technology, Harbin 150001, China
  • 2National Key Laboratory of Electromagnetic Environment (LEME), China Research Institute of Radio Wave Propagation, Beijing 102206, China
  • 3CAS Key Laboratory of Geospace Environment and Department of Modern Physics, University of Science and Technology of China, Hefei 230026, China
  • 4Center of Space Environment of Polar Regions, Harbin Institute of Technology, Harbin 150001, China

Abstract. In this paper, a growth and motion model is developed to investigate the evolution of radius, velocity, and number density of ice particles in mesopause region. In the growth model, meteoric dust from outer atmosphere and grains moving with the upward neutral wind from the mesosphere bottom serve as nuclei upon which water vapor can condense in the cold and moist condition. And the motion of the ice particles is mainly controlled by the gravity and the neutral drag force. It is shown that the radius of ice particles increases linearly with time. But the particle velocity has a complicated relationship with the radius due to the different mass densities of condensation nuclei and absorbed ice. For certain condensation core radius, the velocity of particles can be reversed at particular height, which leads to local gathering of particles near the boundary layer and small-scale structures of ice particle density on the order of a few meters. Based on the obtained small-scale ice particle distribution, the mean particle charge number and corresponding distributions of electrons are calculated by combining the dust charging processes and quasi-neutrality condition. It shows that the absorption of electrons by ice particles results in the formation of small-scale electron density structures, which can be important to the research on the cause of polar mesosphere summer echoes (PMSE).

Ruihuan Tian et al.
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Short summary
The density distribution of ice particles and electrons near the boundary of PMSE region is studied. The results show that when the radius distribution function of condensation nucleus is Gaussian type, for a certain range of the condensation core radius, sharp peaks with scale of meters appear in the density profiles of ice particles and electrons. These small-scale structures of electron density may be one of the reasons of PMSE phenomenon.
The density distribution of ice particles and electrons near the boundary of PMSE region is...
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