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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)
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2022
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Source: Geophysical Research Letters, 49(16)
[PDF-1.60 MB]
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Journal Title:Geophysical Research Letters
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Description:We 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.
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Source:Geophysical Research Letters, 49(16)
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DOI:
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ISSN:0094-8276;1944-8007;
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Rights Information:CC BY-NC-ND
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Compliance:Submitted
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