Different Behavior of Density Perturbations Between Dayside and Nightside in the Martian Thermosphere and the Ionosphere Associated With Atmospheric Gravity Waves
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View abstract on PubMed
Summary
This summary is machine-generated.Atmospheric gravity waves (GW) explain Martian ionospheric perturbations on the dayside, but not always on the nightside. Ion behavior differs between Martian dayside and nightside, with unexplained phenomena observed.
Area Of Science
- Planetary Science
- Aeronomy
- Ionospheric Physics
Background
- Ionospheric perturbations on Mars are investigated using data from the Neutral Gas and Ion Mass Spectrometer (NGIMS) on the Mars Atmosphere and Volatile EvolutioN (MAVEN) mission.
- Perturbations are categorized into ion-neutral coupling, ion-specific, and coronal mass ejection events.
Purpose Of The Study
- To determine the extent to which atmospheric gravity waves (GW) explain observed ionospheric perturbations on Mars.
- To investigate the differing mechanisms driving ion perturbations on the Martian dayside versus nightside.
Main Methods
- Comparison of NGIMS data with a numerical model to assess the role of GW.
- Categorization of ionospheric perturbations into distinct types based on ion and neutral behavior.
- Analysis of ion and neutral perturbation correlations under varying solar zenith angles.
Main Results
- Neutral perturbations on the Martian dayside (170-190 km) show excellent agreement with GW.
- Neutral perturbations on the nightside (190-210 km) are not always explained by GW.
- Ion perturbations agree well with GW on the dayside but show low agreement on the nightside, indicating strong ion-neutral coupling.
- Ion perturbation behavior is distinctly different between dayside and nightside.
- Correlation between ions and neutrals breaks down near southern dusk.
- Unexplained behaviors are observed at night and near southern dusk.
Conclusions
- Atmospheric gravity waves are a significant driver of dayside ionospheric perturbations on Mars.
- The mechanisms driving ionospheric perturbations differ between the Martian dayside and nightside.
- Further research is needed to explain observed nightside and dusk-side ionospheric phenomena.
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