Integrated Science Investigation of the Sun

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.[1] IS☉IS is focused on measuring energetic particles from the Sun, including electrons, protons, and ions.[2] The parent spacecraft was launched in early August 2018, and with multiple flybys of Venus will study the heliosphere of the Sun from less that 4 million kilometers or less than 9 solar radii.[3][4]

IS☉IS hardware being prepared for its mission, EPI-Lo hardware shown in 2017

IS☉IS consists of two detectors, EPI-Lo and EPI-Hi, corresponding to detection of relatively lower and higher energy particles.[5] 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.[6] 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.[7]

The shortname includes a symbol for the Sun, a circle with a dot in it: ☉.[8] NASA suggests pronouncing the name as "ee-sis" in English.[9]

Operations
Labeled diagram of IS☉IS

By September 2018, IS☉IS had been turned on and first light data was returned.[10]

Epi-Hi

EPI-HI includes:[11]

  • 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.[12]

EPI-Lo

EPI-Lo includes 8 wedge detectors, fed by 80 separate entrances.[13] These entrances correspond to covering a field of view over almost a full hemisphere.[14]

EPI-Lo can record differential energy spectra for:[15]

Names
  • Integrated Science Investigation of the Sun[16]
  • ISIS[17]
  • IS☉IS[18]
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See also

References
  1. JHUAPL. "Parker Solar Probe Instruments: IS☉IS". Parker Solar Probe. Retrieved 2018-10-20.
  2. JHUAPL. "Parker Solar Probe Instruments: IS☉IS". Parker Solar Probe. Retrieved 2018-12-23.
  3. "NASA Solar Probe Flies By Venus on Its Way to 'Touch' the Sun". Space.com. Retrieved 2018-10-20.
  4. JHUAPL. "After Near-Perfect Trajectory Maneuver, Parker Solar Probe On Course To Touch The Sun". Parker Solar Probe. Retrieved 2018-10-20.
  5. McComas, D. J.; Alexander, N.; Angold, N.; Bale, S.; Beebe, C.; Birdwell, B.; Boyle, M.; Burgum, J. M.; Burnham, J. A. (2014-07-05). "Integrated Science Investigation of the Sun (ISIS): Design of the Energetic Particle Investigation". Space Science Reviews. 204 (1–4): 187–256. doi:10.1007/s11214-014-0059-1. ISSN 0038-6308.
  6. McComas, D. J.; Alexander, N.; Angold, N.; Bale, S.; Beebe, C.; Birdwell, B.; Boyle, M.; Burgum, J. M.; Burnham, J. A. (2014-07-05). "Integrated Science Investigation of the Sun (ISIS): Design of the Energetic Particle Investigation". Space Science Reviews. 204 (1–4): 187–256. doi:10.1007/s11214-014-0059-1. ISSN 0038-6308.
  7. McComas, D. J.; Alexander, N.; Angold, N.; Bale, S.; Beebe, C.; Birdwell, B.; Boyle, M.; Burgum, J. M.; Burnham, J. A. (2014-07-05). "Integrated Science Investigation of the Sun (ISIS): Design of the Energetic Particle Investigation". Space Science Reviews. 204 (1–4): 187–256. doi:10.1007/s11214-014-0059-1. ISSN 0038-6308.
  8. JHUAPL. "Parker Solar Probe Instruments: IS☉IS". Parker Solar Probe. Retrieved 2018-10-20.
  10. "Illuminating First Light Data from Parker Solar Probe – Parker Solar Probe". blogs.nasa.gov. Retrieved 2018-12-23.
  13. https://ntrs.nasa.gov/archive/nasa/casi.ntrs.nasa.gov/20110013395.pdf]
  14. "Integrated Science Investigation of the Sun (ISʘIS) | Space Physics at Princeton".
  16. "Integrated Science Investigation of the Sun (ISʘIS) | Space Physics at Princeton". spacephysics.princeton.edu. Retrieved 2018-10-28.
  17. McComas, D. J.; Alexander, N.; Angold, N.; Bale, S.; Beebe, C.; Birdwell, B.; Boyle, M.; Burgum, J. M.; Burnham, J. A. (2014-07-05). "Integrated Science Investigation of the Sun (ISIS): Design of the Energetic Particle Investigation". Space Science Reviews. 204 (1–4): 187–256. doi:10.1007/s11214-014-0059-1. ISSN 0038-6308.
  18. "Integrated Science Investigation of the Sun (ISʘIS) | Space Physics at Princeton". spacephysics.princeton.edu. Retrieved 2018-10-28.
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