Numerical Simulation of Ionization Enhancement in the Topside Ionosphere of Cusp Foot-Point Region Caused by Low Energy Particle Precipitation  

作　　者：CAI Hongtao MA Shuying G Kirchengast 

机构地区：[1]School of Electronic Information/Key Laboratory ofGeospace Environment and Geodesy of Ministry of Education,Wuhan University, Wuhan 430072, China [2]Institute for Geophysics, Astrophysics and Meteorology,University of Graz, Graz A-8010, Austria

出　　处：《Wuhan University Journal of Natural Sciences》2008年第2期185-190,共6页武汉大学学报（自然科学英文版）

基　　金：the National Natural Science Foundation o China(40404015, 40390150);the Open Foundation of the Key Laboratory o Geospace Environment and Geodesy of Ministry of Education

摘　　要：The Graz Ionospheric Flux Tube Simulations （GIFTS） has been improved. The improved GIFTS model was used to numerically investigate the energy particle precipitation on the distribution of electron density in the ionospheric cusp foot-point region under conditions of large plasma convection during magnetic storm. After including the effects of low energy incident particles, the ionospheric electron densities increase remarkably above altitude of -250 km, showing a peak at about 350 km. The percent enhancements of electron densities increase gradually with altitude, exceed- ing 60% near the upper boundary of the calculation. The calculated ionospheric F2-peak was remarkably enhanced and lifted up by the incident low energy electrons.The Graz Ionospheric Flux Tube Simulations （GIFTS） has been improved. The improved GIFTS model was used to numerically investigate the energy particle precipitation on the distribution of electron density in the ionospheric cusp foot-point region under conditions of large plasma convection during magnetic storm. After including the effects of low energy incident particles, the ionospheric electron densities increase remarkably above altitude of -250 km, showing a peak at about 350 km. The percent enhancements of electron densities increase gradually with altitude, exceed- ing 60% near the upper boundary of the calculation. The calculated ionospheric F2-peak was remarkably enhanced and lifted up by the incident low energy electrons.

关 键 词：magnetic storms particle precipitation CUSP ionization enhancement ionospheric physical model numerical simulation 

分 类 号：P353.2[天文地球—空间物理学] P352.4[天文地球—地球物理学]