Signature of gravity wave propagations from the troposphere to ionosphere

Takahashi, H.; Figueiredo, C. A. O. B.; Essien, Patrick; Wrasse, C. M.; Barros, Diego; Nyassor, Prosper K.; Paulino, Igo; Egito, F.; Rosa, Geangelo M.; Sampaio, Antonio Hélder Rodrigues

doi:10.5194/angeo-40-665-2022

Cited by 2 publications

(3 citation statements)

References 34 publications

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“…Coupling between GWs and the ionosphere in the Martian ionosphere has been previously reported (Leelavathi et al., 2023; Roeten et al., 2022). GWB can modify the background wind fields, thus affecting the ionospheric plasma (Takahashi et al., 2022). Neutral winds have been measured by the MAVEN/NGIMS since 2016, but no observational data for neutral winds is available during the event in Figures 2 and 3, because the NGIMS closed its routine measurements of neutral atmospheric density when it initiated wind observations (Benna et al., 2019).…”

Section: Discussionmentioning

confidence: 99%

“…It is well known that GWB can modulate the background wind field (Ji et al., 2022; Liu et al., 2014; Takahashi et al., 2022; Yiğit et al., 2021). To better elucidate the process of ionospheric instability formation driven by wind shear associated with GWs, we performed nonlinear numerical simulations with wind shear as the source of perturbation to initiate the process.…”

Section: Simulation Of Gwb Related Wind Shear As Source Of Perturbationmentioning

confidence: 99%

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On the Gravity Wave‐Seeded Ionospheric Irregularities in the Martian Ionosphere

Tian,

Jiang,

Sánchez‐Cano

et al. 2024

JGR Planets

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For the past few decades, it has been demonstrated that gravity waves (GWs) and neutral winds can drive ionospheric irregularities on Earth. Still, as far as we know, the formation of ionospheric irregularities on Mars due to GWs has not been well studied. In this study, we use data from the NASA's Mars Atmosphere and Volatile Evolution (MAVEN) mission to show evidence of an irregularity event in the Martian ionosphere, potentially seeded by the GWs break (GWB). Statistical findings indicate that the observed ratio of GWB‐related irregularity events varies from ∼0.25 to ∼0.47 each year, and the average ratio in 2015–2020 is ∼0.37. We perform a numerical simulation to provide further insight into the processes behind irregularity formation, which employs neutral wind shear as a source of perturbation in the context of the GWB. The simulations yield results fundamentally aligned with the observed characteristics of ionospheric irregularities in the 2018 event by considering the wind shear as the disturbance source. This study provides supplementary insights into the perturbation sources involved in shaping irregularities within the Martian ionosphere and presents valuable information about the coupling between the Martian ionosphere and the lower atmosphere.

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Section: Discussionmentioning

confidence: 99%

Section: Simulation Of Gwb Related Wind Shear As Source Of Perturbationmentioning

confidence: 99%

On the Gravity Wave‐Seeded Ionospheric Irregularities in the Martian Ionosphere

Tian,

Jiang,

Sánchez‐Cano

et al. 2024

JGR Planets

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“…It provides a time-dependent, observationally based, global empirical specification of the upper atmospheric general circulation patterns and migrating tides. This allows the retrieval of GW intrinsic parameters, such as the direction of horizontal propagation source of the GWs as inputs for raytracing models [66,67]. In this study, high-altitude zonal and meridional winds are extracted from the model to obtain intrinsic parameters from nightglow images (Figure 3).…”

Section: Empirical Model Of Horizontal Winds Hwm14mentioning

confidence: 99%

Case Study of a Mesospheric Temperature Inversion over Maïdo Observatory through a Multi-Instrumental Observation

et al. 2023

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The dynamic vertical coupling in the middle and lower thermosphere (MLT) is documented over the Maïdo observatory at La Réunion island (21°S, 55°E). The investigation uses data obtained in the framework of the Atmospheric dynamics Research InfraStructure in Europe (ARISE) project. In particular, Rayleigh lidar and nightglow measurements combined with other observations and modeling provide information on a mesospheric inversion layer (MIL) and the related gravity waves (GWs) on 9 and 10 October 2017. A Rossby wave breaking (RWB) produced instabilities in the sheared background wind and a strong tropospheric activity of GWs on 9–11 October above La Réunion. The MIL was observed on the night of 9 October when a large amount of tropospheric GWs propagated upward into the middle atmosphere and disappeared on 11 October when the stratospheric zonal wind filtering became a significant blocking. Among other results, dominant mesospheric GW modes with vertical wavelengths of about 4–6 km and 10–13 km can be traced down to the troposphere and up to the mesopause. Dominant GWs with a wavelength of ~2–3 km and 6 km also propagated upward and eastward from the tropospheric source into the stratosphere on 9–11 October. Sounding of the Atmosphere using Broadband Emission Radiometry (SABER) temperature and OH profiles indicate that GW activity in the middle atmosphere affects the upper atmosphere with waves breaking at heights below the MIL and in the mesopause. Several techniques are illustrated on nightglow images to access GW activity and spectral characteristics at the mesopause for high and low frequency GWs on the nights of 9–10 October. In conclusion, intense tropospheric activity of GWs induced by RWB events can be linked with MILs at the subtropical barrier in the South-West Indian Ocean during austral winter.

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Signature of gravity wave propagations from the troposphere to ionosphere

Cited by 2 publications

References 34 publications

On the Gravity Wave‐Seeded Ionospheric Irregularities in the Martian Ionosphere

On the Gravity Wave‐Seeded Ionospheric Irregularities in the Martian Ionosphere

Case Study of a Mesospheric Temperature Inversion over Maïdo Observatory through a Multi-Instrumental Observation

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