Data Set
MAVEN/IUVS Observations of OH Prompt Emission: Daytime Water Vapor in the Thermosphere of Mars Public Deposited
- Abstract
We report daytime thermospheric water vapor observations on Mars. The limb observations by the Imaging Ultraviolet Spectrograph (IUVS) on the Mars Atmosphere and Volatile Evolution (MAVEN) spacecraft are of hydroxyl (OH) prompt emission near 308 nm, which is excited directly from photodissociation of water vapor by the solar Lyman-a flux. Average peak water vapor densities between 120-140 km are 3 ´ 107 cm-3 near perihelion. The water vapor observations also show a strong diurnal variation of water vapor with a peak near midday and a non-detection at sunrise and sunset, consistent with existing observations reported at the terminator from solar occultations. To help reconcile the IUVS water vapor observations, we also report the simultaneous observation of OH solar resonance fluorescence emission near 308 nm in the thermosphere, which enables the retrieval of OH densities. Using a one-dimensional photochemical model initialized with the daytime IUVS water vapor observations, modeled peak OH densities are in quantitative agreement with observed IUVS OH peak densities. Because the observed thermospheric temperatures are controlled by solar insolation and exceed the water frost point during the day, we argue that the IUVS observed water vapor is created from the daily sublimation of water ice particles. We discuss the implications of the IUVS observations on the present-day loss of water vapor from Mars in the form of atomic hydrogen.
- Creator
- Academic Affiliation
- Last Modified
- 2023-11-29
- Location
- Boulder
- Resource Type
- Rights Statement
- DOI
- Language
- Citation
- Jain, S. K., Stevens, M., & Schneider, N. M. (2023). MAVEN/IUVS Observations of OH Prompt Emission: Daytime Water Vapor in the Thermosphere of Mars [Data set]. University of Colorado Boulder. https://doi.org/10.25810/ZJXF-PG40
Relationships
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README_MAVEN-IUVS_MHS.txt | 2023-11-29 | Public | Download |
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mvn_iuv_L2_OH_MY35_aphelion_v01r00.nc | 2023-11-13 | Public | Download |
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mvn_iuv_L2_OH_MY35_perihelion_v01r00.nc | 2023-11-13 | Public | Download |
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mvn_iuv_L2_OH_MY34_perihelion_v01r00.nc | 2023-11-13 | Public | Download |
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mvn_iuv_L2_OH_MY34_aphelion_v01r00.nc | 2023-11-13 | Public | Download |
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L1c_05000.zip | 2023-11-22 | Public | Download |
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mission_cover_34.jpg | 2023-11-22 | Public | Download |
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mission_cover_35.jpg | 2023-11-22 | Public | Download |