First Simultaneous Lidar Observations of Thermosphere‐Ionosphere Sporadic Ni and Na (TISNi and TISNa) Layers (∼105–120 km) Over Beijing (40.42°N, 116.02°E) Journal Article uri icon

Overview

abstract

  • AbstractWe report the first simultaneous lidar observations of thermosphere‐ionosphere sporadic nickel and Na (TISNi and TISNa) layers in altitudes ∼105–120 km over Yanqing (40.42°N, 116.02°E), Beijing. From two years of data spanning April 2019 to April 2020 and July 2020 to June 2021, TISNi layers in May and June possess high densities with a maximum of 818 cm−3 on 17 May 2021, exceeding the density of main layer peak (∼85 km) by ∼4 times. They correlate with strong sporadic E layers observed nearby. TISNa layers occur at similar altitudes as TISNi with spatial‐temporal correlation coefficients of ∼1. The enrichment of Ni in TISNi is evident as the [TISNi]/[TISNa] column abundance ratios are ∼1, about 10 times the main layer [Ni]/[Na] ratios. These results are largely explained by neutralization of converged Ni+ and Na+ ions via recombination with electrons. Calculations show direct recombination dominating over dissociative recombination above ∼105 km.

publication date

  • August 28, 2022

has restriction

  • green

Date in CU Experts

  • August 30, 2022 2:54 AM

Full Author List

  • Wu F; Chu X; Du L; Jiao J; Zheng H; Xun Y; Feng W; Plane JMC; Yang G

author count

  • 9

Other Profiles

International Standard Serial Number (ISSN)

  • 0094-8276

Electronic International Standard Serial Number (EISSN)

  • 1944-8007

Additional Document Info

volume

  • 49

issue

  • 16