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Retrieval of Mouse Oocytes
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Daytime Ionosphere Retrieval Algorithm for the Ionospheric Connection Explorer (ICON).

Andrew W Stephan1, Eric J Korpela2, Martin M Sirk2

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

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|July 24, 2018
PubMed
Summary
This summary is machine-generated.

The NASA ICON EUV instrument measures extreme-ultraviolet emissions to derive ionospheric O+ density. This new algorithm accurately determines F-region electron content, meeting key science objectives.

Keywords:
ICON Explorer missionIonosphereLimb inversionsUltraviolet airglow

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Area of Science:

  • Space physics
  • Atmospheric science
  • Ionospheric research

Background:

  • The NASA Ionospheric Connection Explorer (ICON) Extreme Ultraviolet (EUV) spectrograph measures daytime EUV OII emissions.
  • These emissions are crucial for determining ionospheric density profiles and state parameters.

Purpose of the Study:

  • To describe the algorithm for inverting OII emission profiles to derive O+ density.
  • To use O+ density as a proxy for F-region electron content.
  • To assess the algorithm's accuracy and ability to meet ICON science objectives.

Main Methods:

  • Developed an inversion algorithm using measured OII emission profiles.
  • Incorporated a bias evaluation and feedback step to mitigate instrument errors.
  • Performed end-to-end simulations using ICON EUV instrument response and airglow profiles.

Main Results:

  • The algorithm successfully derived O+ density profiles from 150-450 km.
  • Simulations showed the algorithm reproduced hmF2 values with <5 km accuracy and NmF2 with <12% accuracy.
  • The ICON EUV instrument and algorithm meet science objectives for vertical resolution and precision.

Conclusions:

  • The developed algorithm effectively derives ionospheric O+ density from ICON EUV measurements.
  • The algorithm mitigates systematic instrument errors, enhancing data reliability.
  • The ICON EUV instrument and algorithm are capable of meeting critical ionospheric research objectives.