The technical optimization of Na-K lidar and to measure mesospheric Na and K over Brazil

Du, Lidong; Jiao, Jiaguo; Li, Faquan; Lin, Xin; Liu, Zhengkuan; Batista, P. P.; Pimenta, A. A.; Andrioli, V. F.; Wang, Jihong; Chen, Xuewu; Xia, Yuan; Wu, Fuju; Yang, Guotao

doi:10.1016/j.jqsrt.2020.107383

Cited by 3 publications

(2 citation statements)

References 30 publications

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“…Based on the resonance fluorescence scattering mechanism, this lidar can simultaneously obtain Na and K atom signals from the MLT region. Details about the system and data acquisition can be found in [21] and [22]. This LIDAR provides Na and K photon counts with a resolution of 20 s and 96 m for time and height, respectively.…”

Section: Methodsmentioning

confidence: 99%

C-Structures in Mesospheric Na and K Layers and Their Relations with Dynamical and Convective Instabilities

Andrioli

Batista

et al. 2022

Atmosphere

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We analyzed the C-structures in the mesospheric metal layers. We used two datasets: one from a narrow band Sodium (Na) Density and Temperature LIDAR and the other from a high-resolution dual band Na and Potassium (K) LIDAR, both operated at São José dos Campos, Brazil (23° S, 46° W). We also investigated the Es layer occurrence and wind shear influences forming these structures. We found three C-type events over 82 analyzed nights in the first data set. They all showed lower temperatures inside C-structures compared to the borders. The squared Brunt-Väissälä frequency analyses showed positive values in the region of C-structures. In two out of three cases, dynamical instability was present (Ri < 0.25). We compared these results with the nine simultaneous C-type events identified in the 185 nights from the second data set. They showed height and time simultaneity correspondence as observed in the Na and K layers. Our results showed a low correlation between Es occurrence and C-structures. Additionally, strong wind shears in the altitude and time where C-structures appeared were always present. The advection of a metal cloud to the LIDAR station and a wind distortion seems to be the plausible mechanism that can explain all the observations.

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Section: Methodsmentioning

confidence: 99%

C-Structures in Mesospheric Na and K Layers and Their Relations with Dynamical and Convective Instabilities

Andrioli

Batista

et al. 2022

Atmosphere

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“…The reflectance at 393 nm and 423 nm was greater than 95.1% and 94.2%, respectively. By using dual-optical fiber focal plane splitting technology, the back-scattered photon signals of the 393 nm and 423 nm were coupled to their respective receiving optical fibers [16]. Considering the loss of light in optical fiber transmission, the fiber length was made the shortest in terms of spatial distance, and here the fiber had a length of 1 m and the core of the optical fiber was 1.5 mm.…”

Section: Receiving and Acquisition Systemmentioning

confidence: 99%

The All-Solid-State Narrowband Lidar Developed by Optical Parametric Oscillator/Amplifier (OPO/OPA) Technology for Simultaneous Detection of the Ca and Ca+ Layers

Du,

Zheng,

Xiao

et al. 2023

Remote Sensing

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We report an all-solid-state narrowband lidar system for the simultaneous detection of Ca and Ca+ layers over Yanqing (40.41°N, 116.01°E). The uniqueness of this lidar lies in its transmitter, which is based on optical parametric oscillation (OPO) and optical parametric amplification (OPA) techniques. The injection seeded OPO and the OPA are pumped by the second harmonic of an injection-seeded Nd:YAG laser, which can generate coherent light at the wavelength of 786 nm or 846 nm lasers, whose second harmonics in turn generate the 393 nm or 423 nm pulses, respectively, for the detection of thermospheric and ionospheric Ca+ and Ca layers. Compared to the conventional dye-based system, this lidar transmitter is a narrowband system (bandwidth < 200 MHz), which has produced a factor of two more output power with higher stability and reliability. The lidar system in Yingqing demonstrated Ca+ detection sensitivity of 0.1 atoms-cm−3 for long-term observation and reached a height of ~300 km. Potential applications and further improvements in this lidar technique are also discussed in this paper.

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Advances in the Researches of the Middle and Upper Atmosphere in China in 2020–2022

Zey

2022

kjkxxb

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The technical optimization of Na-K lidar and to measure mesospheric Na and K over Brazil

Cited by 3 publications

References 30 publications

C-Structures in Mesospheric Na and K Layers and Their Relations with Dynamical and Convective Instabilities

C-Structures in Mesospheric Na and K Layers and Their Relations with Dynamical and Convective Instabilities

The All-Solid-State Narrowband Lidar Developed by Optical Parametric Oscillator/Amplifier (OPO/OPA) Technology for Simultaneous Detection of the Ca and Ca+ Layers

Advances in the Researches of the Middle and Upper Atmosphere in China in 2020–2022

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