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Inferring Nighttime Ionospheric Parameters With the Far Ultraviolet Imager Onboard the Ionospheric Connection
Farzad Kamalabadi1, Jianqi Qin, Brian J Harding
1Department of Electrical and Computer Engineering, University of Illinois at Urbana-Champaign, 1308 West Main Street, Urbana, IL 61801.
Space Science Reviews
|April 2, 2021
Summary
The Ionospheric Connection Explorer (ICON) Far Ultraviolet (FUV) imager measures emissions to understand the nighttime ionosphere. This study develops a model to derive oxygen ion (O+) profiles from FUV measurements.
Area of Science:
- Space Physics
- Atmospheric Science
- Remote Sensing
Background:
- The nighttime ionosphere's state is crucial for radio wave propagation and space weather.
- Accurate ionospheric parameter estimation requires sophisticated modeling of atmospheric emissions.
- The Ionospheric Connection Explorer (ICON) mission aims to study ionosphere-thermosphere coupling.
Purpose of the Study:
- To develop a radiative transfer model for OI 135.6 nm emissions from first principles.
- To quantify physical processes affecting 135.6 nm photon production and transport in the ionosphere.
- To invert ICON Far Ultraviolet (FUV) measurements to derive nighttime ionospheric O+ profiles.
Main Methods:
- Developed a comprehensive radiative transfer model for OI 135.6 nm emissions.
- Incorporated mutual neutralization, resonant scattering, and molecular absorption effects.
- Utilized a constrained optimization algorithm to invert ICON FUV line-of-sight measurements.
Main Results:
- Established a connection between ICON FUV measurements and nighttime ionospheric parameters.
- Demonstrated the inversion of emission profiles to derive O+ profiles.
- Derived O+ profiles from 150-450 km, reflecting F-region electron density.
Conclusions:
- The developed model and inversion technique enable accurate estimation of nighttime ionospheric parameters.
- ICON FUV measurements provide valuable data for understanding ionospheric dynamics.
- The derived O+ profiles directly inform electron density estimations in the ionosphere's F-region.
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