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Tomographic extreme-ultraviolet spectrographs: TESS.

D M Cotton1, A Stephan, T Cook

  • 1Center for Space Physics and the Department of Astronomy, Boston University, 725 Commonwealth Avenue, Boston, Massachusetts 02215, USA. dcotton@bu.edu

Applied Optics
|March 20, 2008
PubMed
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The Tomographic Extreme Ultraviolet SpectrographS (TESS) system on the TERRIERS satellite provides high-sensitivity measurements of ionospheric emissions. These instruments enable detailed atmospheric studies for improved space weather modeling.

Area of Science:

  • Space Physics
  • Atmospheric Science
  • Remote Sensing

Background:

  • The Earth's ionosphere is crucial for radio communication and navigation.
  • Understanding ionospheric dynamics requires accurate measurements of atmospheric emissions.
  • Previous instruments lacked the sensitivity and resolution for detailed tomographic analysis.

Purpose of the Study:

  • To introduce the Tomographic Extreme Ultraviolet SpectrographS (TESS) system.
  • To detail the design and capabilities of the TESS instruments for the TERRIERS mission.
  • To enable tomographic inversion of ionospheric EUV emissions.

Main Methods:

  • Deployment of five spectrographs (four for nightglow, one for daytime).
  • Utilizing microchannel-plate detectors with wedge-and-strip anode readouts.

Related Experiment Videos

  • Calibrating instruments for high-sensitivity line-of-sight measurements (80 counts/s)/Rayleigh).

    • Main Results:

    • TESS instruments designed for high sensitivity and spectral resolution (1-2 nm).
    • Bandpass of 80-140 nm optimized for key oxygen emissions (135.6- and 91.1-nm).
    • TERRIERS satellite successfully launched on May 18, 1999.

    Conclusions:

    • The TESS system provides unprecedented data for ionospheric research.
    • Tomographic inversion of TESS data will yield detailed 3D ionospheric structures.
    • This research advances our understanding of space weather phenomena.