Wave Activity of Gravity Waves in the Mesosphere and Lower Thermosphere during a Meteorological Storm

IF 0.7 4区地球科学 Q4 GEOCHEMISTRY & GEOPHYSICS Geomagnetism and Aeronomy Pub Date : 2024-08-13 DOI:10.1134/S0016793224600358

O. P. Borchevkina, F. S. Bessarab, A. V. Timchenko, I. V. Karpov

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Abstract

The effect of a meteorological storm in October 2018 in the Baltic Sea on the state of the mesosphere and lower thermosphere is investigated. The wave activity of internal gravity waves from TIMED/SABER satellite data is analyzed, and the effects of the meteorological storm at heights of 80–100 km are determined. A method based on mode decomposition from SABER data is adapted to calculate the gravity wave potential energy density (GWPED) and to isolate the temperature perturbations caused by their propagation at lower thermospheric heights. Wavelet analysis of the temperature perturbations revealed two ranges of vertical wavelengths, 5–8 km and 14–18 km. In the area of a meteorological storm, the amplitude of internal gravity waves with vertical wavelengths of 5–8 km increases, and the area of their maximum expands and shifts upward to heights of ~90 km, while on meteorologically quiet days these waves are observed at heights of 65–70 km and with smaller amplitudes. Above the area of a meteorological storm at heights of 90–100 km, the values of the gravity wave potential energy density increase significantly compared to quiet days before and after the storm, and the spatial extent of the perturbation area increases.

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气象风暴期间中间层和下热层重力波的波活动性

摘要研究了 2018 年 10 月波罗的海气象风暴对中间层和低温层状态的影响。分析了 TIMED/SABER 卫星数据中内部重力波的波活动，并确定了气象风暴在 80-100 公里高度的影响。采用基于 SABER 数据模式分解的方法计算了重力波势能密度（GWPED），并分离出重力波在低热层高度传播所造成的温度扰动。对温度扰动的小波分析显示了两个垂直波长范围：5-8 千米和 14-18 千米。在气象风暴区域，垂直波长为 5-8 千米的内部重力波的振幅增大，其最大值区域扩大并上移到约 90 千米的高度，而在气象平静的日子里，这些波在 65-70 千米的高度被观测到，振幅较小。在 90-100 公里高空的气象风暴区域上方，重力波势能密度值与风暴前后的平静日相比显著增加，扰动区域的空间范围也增大。

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来源期刊

Geomagnetism and Aeronomy Earth and Planetary Sciences-Space and Planetary Science

CiteScore

1.30

自引率

33.30%

发文量

审稿时长

4-8 weeks

期刊介绍： Geomagnetism and Aeronomy is a bimonthly periodical that covers the fields of interplanetary space; geoeffective solar events; the magnetosphere; the ionosphere; the upper and middle atmosphere; the action of solar variability and activity on atmospheric parameters and climate; the main magnetic field and its secular variations, excursion, and inversion; and other related topics.