[P-EM15] 太陽地球系結合過程の研究基盤形成

[PEM15-15] D-region ion line: the influence of charged dust on incoherent scatter

*Ingrid Brigitte Mann¹、Tinna Lif Gunnarsdottir¹、Devin R. Huyghebaert¹、Isabel M. Nerland¹、Wuhu Feng²、John M.C. Plane²、Yasunobu Ogawa³、Ingemar Haeggstroem⁴、Satonori Nozawa⁵、Norihito Saito⁵、Takuya D. Kawahara⁵、Neethal Thomas⁶ (1.Dept. of Physics and Technology, UiT, The Arctic University of Norway、2.University of Leeds, UK、3.Japan National Polar Research Institute、4.EISCAT Scientific Association, Kiruna, Sweden、5.ISEE, Nagoya University, Japan、6.SGO, University of Oulu, Finland)

キーワード：D-region ionosphere, Mesosphere, Meteoric Smoke, Incoherent Scatter

The influence of the charged dust on incoherent scatter may be found in the ion line measured in the D-region. From model calculations we have found that the best conditions to recognize the influence from the dust component is in winter during conditions with high electron density. In a case study we investigate the spectrum measured with the EISCAT VHF in January during conditions with high electron content. The dust reference is based on a global circulation model calculation. While we can see the possible influence of charged dust particles in the innermost part of the ion line spectrum, ion - neutral collisions also play a role and we could not fit the spectrum with the typical ion collision parameters. In addition, the analysis requires independent temperature information. We discuss implications for future D-region studies using EISCAT_3D.