Ionospheric effects of the Leonid meteor shower in November 2001 as observed by rapid run ionosondes

摘要: [1] We operated ionosondes at four stations in a rapid-run mode to obtain ionograms every minute for 102 hours during the period of Leonid meteor shower November 2001. Plenty radio echoes that looked like echo traces produced by sporadic E reflection were seen ionograms, and this allowed statistical analysis single event, including discrimination backscattering trails from horizontally stratified layer. The categorized into three types. first spontaneous echoes, which distributed across wide range virtual heights; times maximum activity, there was statistically good correlation among stations. type appear be Fresnel trails. second also observed but persisted several tens minutes same height as typical layer, top frequency these decayed with time. Echoes are thus attributed meteor-induced patch. last appeared outside activity heights conventional no time between events These periodical increase fOEs, is modulated planetary-wave have relation shower.