Gravity wave driven variability in the Mars ionosphere-thermosphere system

Leelavathi, V.; Rao, N. V. S.; Rao, S. Vijaya Bhaskara

doi:10.1016/j.icarus.2023.115430

Cited by 8 publications

(6 citation statements)

References 41 publications

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“…In a sense, the state of the ionosphere at an instant of time is an integral of the past EUV insolation (Schmölter et al., 2022). The ionosphere is also relying on the state of the atmosphere and exosphere, which are highly variable in space and time at Mars (Chaufray et al., 2015; Fowler et al., 2022a; Leelavathi et al., 2023). That the EUV insolation affects the state of the magnetosphere on long timescales requires that we look at the effects over times longer than one orbit.…”

Section: Resultsmentioning

confidence: 99%

The Influence of Solar Irradiation and Solar Wind Conditions on Heavy Ion Escape from Mars

Zhang,

Holmström,

Wang

et al. 2023

JGR Space Physics

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We apply a recently proposed method to estimate heavy ion escape from Mars. The method combines in situ observations with a hybrid plasma model, which treats ions as particles and electrons as a fluid. With this method, we investigate how solar upstream conditions, including solar extreme ultraviolet (EUV) radiation, solar wind dynamic pressure, and interplanetary magnetic field (IMF) strength and cone angle, affect the heavy ion loss. The results indicate that the heavy ion escape rate is greater in high EUV conditions. The escape rate increases with increasing solar wind dynamic pressure, and decreases as the IMF strength increases. The ion escape rate is highest when the solar wind is parallel to the IMF and lowest when they are perpendicular. The plume escape rate decreases when the solar wind convective electric field increases.

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Section: Resultsmentioning

confidence: 99%

The Influence of Solar Irradiation and Solar Wind Conditions on Heavy Ion Escape from Mars

Zhang,

Holmström,

Wang

et al. 2023

JGR Space Physics

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show abstract

“…In a sense, the state of the ionosphere at an instant of time is an integral of the past EUV insolation (Schmölter et al, 2022). The ionosphere is also relying on the state of the atmosphere and exosphere, which are highly variable in space and time at Mars (Chaufray et al, 2015;Fowler et al, 2022a;Leelavathi et al, 2023). That the EUV insolation affects the state of the magnetosphere on long timescales requires that we look at the effects over times longer than one orbit.…”

Section: Escape Variations With Solar Euv Radiationmentioning

confidence: 99%

The Influence of Solar Irradiation and Solar Wind Conditions on Heavy Ion Escape From Mars

Zhang

Holmström

et al. 2023

Preprint

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“…While Leelavathi et al. (2023) made strides in this direction by utilizing Ar and heavier ions (O + and O 2 + ), a deeper perspective could be gained by extending the analysis to encompass GWs in He. Although the impacts of the 2018 Global Dust Storm (GDS) on thermospheric GWs have been examined in relation to heavier species (Leelavathi et al., 2020; Yiğit, Medvedev, Benna, Jakosky, 2021; Yiğit, Medvedev, & Hartogh, 2021), such an investigation has yet to be conducted for GWs in lighter species.…”

Section: Introductionmentioning

confidence: 99%

“…In a recent study using MAVEN observations on Mars, Leelavathi et al. (2023) demonstrated that, in the long wavelength limit, GWs in Ar had larger amplitudes compared to those in O + and O 2 + . Conversely, in the short wavelength limit, GWs in O + and O 2 + exhibited larger amplitudes compared to those in Ar.…”

Section: Introductionmentioning

confidence: 99%

A Comparative Analysis of Gravity Waves in He and Ar Densities in the Martian Thermosphere

Leelavathi,

Rao

2024

JGR Planets

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In this study, we conducted a comparative analysis of gravity waves (GWs) in the Martian upper thermosphere, utilizing He and Ar densities measured by the Neutral Gas and Ion Mass Spectrometer aboard the Mars Atmosphere and Volatile EvolutioN spacecraft. Our investigation revealed that GWs are a persistent phenomenon in Martian thermospheric He densities, akin to their presence in heavier species like Ar and CO2. Intriguingly, we observed that local time and seasonal variations in He GW amplitudes exhibit an almost opposite pattern compared to those in Ar. A significant breakthrough was the identification of a temperature‐dependent transition wavelength distinctly demarcating short and long wavelengths. This transition wavelength, which increases with increasing background temperatures, profoundly influences the dominance of GW amplitudes in He and Ar. In the short‐wavelength limit, GW amplitudes in He prevail, while GW amplitudes in Ar take precedence in the long‐wavelength limit. During periods of lower temperatures during midnight and the dawn terminator, transition wavelengths fall within the observed wavelength range enabling the study of dominance of GWs in He and Ar. Conversely, higher temperatures (>180 K) during daytime and the dusk terminator eliminate transition wavelengths within our observational range. Consequently, the amplitudes of GWs in He dominate over those in Ar. Furthermore, under nominal dust conditions, GWs in both He and Ar exhibit an inverse relationship with their respective background densities. During global dust storm, this inverse relationship is maintained for GWs in He, while GWs in Ar display a slight positive correlation with background Ar densities.

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Gravity wave driven variability in the Mars ionosphere-thermosphere system

Cited by 8 publications

References 41 publications

The Influence of Solar Irradiation and Solar Wind Conditions on Heavy Ion Escape from Mars

The Influence of Solar Irradiation and Solar Wind Conditions on Heavy Ion Escape from Mars

The Influence of Solar Irradiation and Solar Wind Conditions on Heavy Ion Escape From Mars

A Comparative Analysis of Gravity Waves in He and Ar Densities in the Martian Thermosphere

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