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  3. The Interstellar Mapping And Acceleration Probe High Energy (imap-hi) Neutral Atom Imager.
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  3. The Interstellar Mapping And Acceleration Probe High Energy (imap-hi) Neutral Atom Imager.

Related Experiment Video

Photoelectron Imaging of Anions Illustrated by 310 Nm Detachment of F−
06:53

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Published on: July 27, 2018

The Interstellar Mapping And Acceleration Probe High Energy (IMAP-Hi) Neutral Atom Imager.

H O Funsten1, F Allegrini2,3, D B Reisenfeld1

  • 1Los Alamos National Laboratory, PO Box 1663, Los Alamos, NM 87545 USA.

Space Science Reviews
|May 11, 2026

View abstract on PubMed

Summary
This summary is machine-generated.

NASA's IMAP-Hi imager maps energetic neutral atoms (ENAs) from the heliosphere-local interstellar medium interaction. This provides new insights into the heliosphere's structure and dynamics.

Keywords:
ENAsHeliosphereIBEXIMAPInterstellar mediumPlasmaSolar windSpace weather

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Area of Science:

  • Space Physics
  • Astrophysics
  • Planetary Science

Background:

  • The heliosphere, a bubble created by the Sun's wind, interacts with the local interstellar medium (LISM).
  • Energetic Neutral Atoms (ENAs) are produced by charge exchange between solar wind ions and LISM neutral atoms.
  • Understanding this interaction is key to comprehending our solar system's place in the galaxy.

Purpose of the Study:

  • To present the IMAP-Hi Energetic Neutral Atom (ENA) Imager instrument.
  • To detail its design, capabilities, and observing strategy for mapping ENA emissions.
  • To explain how IMAP-Hi data will address fundamental questions about the heliosphere-LISM interaction.

Main Methods:

  • Utilizes two identical single-pixel sensors (IMAP-Hi) covering 0.44-15.6 keV ENA spectral range.
  • Employs specific sensor pointing (Hi-45 and Hi-90) to achieve comprehensive sky coverage over time.
  • Leverages heritage from the IBEX-Hi instrument with significant technological improvements.

    • Main Results:

    • IMAP-Hi acquires global ENA maps with improved energy range, resolution, and signal-to-noise ratio compared to previous missions.
    • Hi-45 sensor maps low-latitude regions annually, while Hi-90 maps the full sky semi-annually.
    • Data will be combined with IMAP-Lo and IMAP-Ultra for a comprehensive view of the interaction region.

    Conclusions:

    • IMAP-Hi is poised to deliver unprecedented ENA datasets for studying the heliosphere's boundary.
    • The instrument's design enables detailed mapping of ENA sources and dynamics.
    • Combined IMAP ENA measurements will significantly advance our understanding of the heliosphere-LISM interface.