Astronomy:Integrated Science Investigation of the Sun

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Short description: Instrument aboard the Parker Solar Probe, to measure energetic particles from the Sun
IS☉IS hardware being prepared for its mission, EPI-Lo hardware shown in 2017

Integrated Science Investigation of the Sun or IS☉IS, is an instrument aboard the Parker Solar Probe, a space probe designed to study the Sun. IS☉IS is focused on measuring energetic particles from the Sun, including electrons, protons, and ions.[1] The parent spacecraft was launched in early August 2018, and with multiple flybys of Venus will study the heliosphere of the Sun from less than 4 million kilometers or less than 9 solar radii.[2][3]

IS☉IS consists of two detectors, EPI-Lo and EPI-Hi, corresponding to detection of relatively lower and higher energy particles.[4] EPI-Lo is designed to detect from about 20 keV per nucleon up to 15 MeV (mega electronvolts) total energy, and for electrons from about 25 keV up to 1000 keV.[4] EPI-Hi is designed to measure charged particles from about 1– to 200 MeV per nucleon and electrons from about 0.5 to 6 MeV, according to a paper about the device.[4]

The shortname includes a symbol for the Sun, a circle with a dot in it: ☉.[1] NASA suggests pronouncing the name as "ee-sis" in English.[5]

Operations

Labeled diagram of IS☉IS

By September 2018, IS☉IS had been turned on and first light data was returned.[6]

EPI-Hi

EPI-Hi includes:[7]

  • High Energy Telescope (1)
    • HET has 16 detectors stacked
  • Low Energy Telescopes (2)
    • LET1 is double ended with 9 stacked detectors
    • LET2 is single ended with 7 stacked detectors

The detectors are solid-state devices.[7]

EPI-Lo

EPI-Lo includes 8 wedge detectors, fed by 80 separate entrances.[7] These entrances correspond to covering a field of view over almost a full hemisphere.[8]

EPI-Lo can record differential energy spectra for electrons, Hydrogen, Helium-3, Helium-4, Carbon, Oxygen, Neon, Magnesium, Silicon, and Iron.[7]

See also

  • JEDI (instrument on Juno Jupiter orbiter that detects energetic particles at Jupiter)

References

  1. ↑ 1.0 1.1 JHUAPL. "Parker Solar Probe Instruments: IS☉IS" (in en). Parker Solar Probe. http://parkersolarprobe.jhuapl.edu/News-Center/Show-Article.php?articleID=86. 
  2. ↑ "NASA Solar Probe Flies By Venus on Its Way to 'Touch' the Sun". Space.com. https://www.space.com/42015-nasa-parker-solar-probe-first-venus-flyby.html. 
  3. ↑ JHUAPL. "After Near-Perfect Trajectory Maneuver, Parker Solar Probe On Course To Touch The Sun" (in en). Parker Solar Probe. http://parkersolarprobe.jhuapl.edu/News-Center/Show-Article.php?articleID=96. 
  4. ↑ 4.0 4.1 4.2 McComas, D. J.; Alexander, N.; Angold, N.; Bale, S.; Beebe, C.; Birdwell, B.; Boyle, M.; Burgum, J. M. et al. (2014-07-05). "Integrated Science Investigation of the Sun (ISIS): Design of the Energetic Particle Investigation" (in en). Space Science Reviews 204 (1–4): 187–256. doi:10.1007/s11214-014-0059-1. ISSN 0038-6308. 
  5. ↑ "Parker Solar Probe Instruments". 12 July 2018. https://www.nasa.gov/content/goddard/parker-solar-probe-instruments. 
  6. ↑ "Illuminating First Light Data from Parker Solar Probe – Parker Solar Probe" (in en-US). 19 September 2018. https://blogs.nasa.gov/parkersolarprobe/2018/09/19/illuminating-first-light-data-from-parker-solar-probe/. 
  7. ↑ 7.0 7.1 7.2 7.3 McComas, D. J.; Christian, E. R.; Wiedenbeck, M. E.; McNutt, R. L.; Cummings, A. C.; Desai, M. I.; Giacalone, J.; Hill, M. E. et al. (January 2011). "The Integrated Science Investigation of the Sun (ISIS): Energetic Particle Measurements for the Solar Probe Plus Mission". 32nd International Cosmic Ray Conference. Beijing, China. https://ntrs.nasa.gov/api/citations/20110013395/downloads/20110013395.pdf. 
  8. ↑ "Integrated Science Investigation of the Sun (ISʘIS) | Space Physics at Princeton". https://spacephysics.princeton.edu/missions-instruments/isois. 



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