کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1777053 | 1523655 | 2012 | 5 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: Possible effect of hyperthermal electrons on the charging of mesospheric dust Possible effect of hyperthermal electrons on the charging of mesospheric dust](/preview/png/1777053.png)
It is generally assumed that negatively charged icy dust particles in the mesosphere are charged by the collection of thermal plasma particles. However, there are some indications that there may be a population of hyperthermal electrons in the D-region under auroral activity under certain conditions (e.g. Margot-Chaker and McNamara, Planetary and Space Science 32, 391, 1984). In this brief communication, we speculate on the effect of a hyperthermal distribution of electrons on dust charging, and how this might affect prevailing turbulence scattering theory for polar summer mesophere echoes.
► We speculate on how hyperthermal electrons that may occur in the D-region under auroral activity could affect dust charging.
► If the dust density is smaller than the density of hyperthermal electrons, the dust negative charge could be enhanced.
► Enhancement of the dust negative charge may lead to increases in the Schmidt numbers by factors of about 2–4.
Journal: Journal of Atmospheric and Solar-Terrestrial Physics - Volume 74, January 2012, Pages 124–128