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Daytime O/N2 Retrieval Algorithm for the Ionospheric Connection Explorer (ICON).

Andrew W Stephan1, R R Meier2,3, Scott L England4

  • 1U.S. Naval Research Laboratory, Washington DC.

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Summary
This summary is machine-generated.

The NASA ICON FUV instrument will measure thermospheric composition, specifically the O/N2 ratio, using far-ultraviolet emissions. Simulation testing shows the instrument and algorithm meet precision requirements for ICON

Keywords:
CompositionICON Explorer missionThermosphereUltraviolet airglow

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Area of Science:

  • Space physics and aeronomy.
  • Atmospheric remote sensing.
  • Thermospheric composition studies.

Background:

  • The thermosphere's composition is crucial for understanding space weather.
  • Previous instruments like GUVI on TIMED provided valuable data.
  • Accurate measurements of thermospheric density and composition are needed.

Purpose of the Study:

  • To describe the algorithm for retrieving thermospheric composition from ICON FUV data.
  • To outline the measurement requirements for the ICON FUV instrument.
  • To validate the ICON FUV's capability to measure the O/N2 ratio.

Main Methods:

  • Utilizing the NASA Ionospheric Connection Explorer (ICON) Far-Ultraviolet (FUV) spectrometer.
  • Measuring daytime far-ultraviolet emissions (OI 135.6 nm and N2 Lyman-Birge-Hopfield bands).
  • Adapting and updating a retrieval algorithm from the GUVI instrument on the TIMED mission.

Main Results:

  • The ICON FUV instrument and retrieval algorithm are designed to measure altitude profiles of thermospheric composition.
  • The system aims to determine the thermospheric column O/N2 ratio with precision better than 8.7% over 500-km samples.
  • Orbit-simulation testing confirms the capability to meet these measurement requirements.

Conclusions:

  • The ICON FUV instrument and its associated algorithm are capable of meeting the mission's objectives for thermospheric composition.
  • The developed method provides necessary measurements for understanding thermospheric density and state parameters.
  • Successful validation through simulation testing supports the ICON mission's scientific goals.