Jupiter as a giant cosmic ray detector

P. B. Rimmer, Craig R. Stark, Ch. Helling

Research output: Contribution to journalArticle

  • 5 Citations

Abstract

We explore the feasibility of using the atmosphere of Jupiter to detect ultra-high-energy cosmic rays (UHECRs). The large surface area of Jupiter allows us to probe cosmic rays of higher energies than previously accessible. Cosmic ray extensive air showers in Jupiter's atmosphere could in principle be detected by the Large Area Telescope (LAT) on the Fermi observatory. In order to be observed, these air showers would need to be oriented toward the Earth, and would need to occur sufficiently high in the atmosphere that the gamma rays can penetrate. We demonstrate that, under these assumptions, Jupiter provides an effective cosmic ray "detector" area of 3.3 × 107 km2. We predict that Fermi-LAT should be able to detect events of energy >1021 eV with fluence 10–7 erg cm–2 at a rate of about one per month. The observed number of air showers may provide an indirect measure of the flux of cosmic rays ≥ 1020 eV. Extensive air showers also produce a synchrotron signature that may be measurable by Atacama Large Millimeter/submillimeter Array (ALMA). Simultaneous observations of Jupiter with ALMA and Fermi-LAT could be used to provide broad constraints on the energies of the initiating cosmic rays.
Original languageEnglish
Number of pages5
JournalAstrophysical Journal Letters
Volume787
Issue number2
DOIs
StatePublished - 14 May 2014

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cosmic ray
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cosmic ray showers
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gamma rays
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Cite this

Rimmer, P. B.; Stark, Craig R.; Helling, Ch. / Jupiter as a giant cosmic ray detector.

In: Astrophysical Journal Letters, Vol. 787, No. 2, 14.05.2014.

Research output: Contribution to journalArticle

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abstract = "We explore the feasibility of using the atmosphere of Jupiter to detect ultra-high-energy cosmic rays (UHECRs). The large surface area of Jupiter allows us to probe cosmic rays of higher energies than previously accessible. Cosmic ray extensive air showers in Jupiter's atmosphere could in principle be detected by the Large Area Telescope (LAT) on the Fermi observatory. In order to be observed, these air showers would need to be oriented toward the Earth, and would need to occur sufficiently high in the atmosphere that the gamma rays can penetrate. We demonstrate that, under these assumptions, Jupiter provides an effective cosmic ray {"}detector{"} area of 3.3 × 107 km2. We predict that Fermi-LAT should be able to detect events of energy >1021 eV with fluence 10–7 erg cm–2 at a rate of about one per month. The observed number of air showers may provide an indirect measure of the flux of cosmic rays ≥ 1020 eV. Extensive air showers also produce a synchrotron signature that may be measurable by Atacama Large Millimeter/submillimeter Array (ALMA). Simultaneous observations of Jupiter with ALMA and Fermi-LAT could be used to provide broad constraints on the energies of the initiating cosmic rays.",
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Jupiter as a giant cosmic ray detector. / Rimmer, P. B.; Stark, Craig R.; Helling, Ch.

In: Astrophysical Journal Letters, Vol. 787, No. 2, 14.05.2014.

Research output: Contribution to journalArticle

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AU - Rimmer,P. B.

AU - Stark,Craig R.

AU - Helling,Ch.

PY - 2014/5/14

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AB - We explore the feasibility of using the atmosphere of Jupiter to detect ultra-high-energy cosmic rays (UHECRs). The large surface area of Jupiter allows us to probe cosmic rays of higher energies than previously accessible. Cosmic ray extensive air showers in Jupiter's atmosphere could in principle be detected by the Large Area Telescope (LAT) on the Fermi observatory. In order to be observed, these air showers would need to be oriented toward the Earth, and would need to occur sufficiently high in the atmosphere that the gamma rays can penetrate. We demonstrate that, under these assumptions, Jupiter provides an effective cosmic ray "detector" area of 3.3 × 107 km2. We predict that Fermi-LAT should be able to detect events of energy >1021 eV with fluence 10–7 erg cm–2 at a rate of about one per month. The observed number of air showers may provide an indirect measure of the flux of cosmic rays ≥ 1020 eV. Extensive air showers also produce a synchrotron signature that may be measurable by Atacama Large Millimeter/submillimeter Array (ALMA). Simultaneous observations of Jupiter with ALMA and Fermi-LAT could be used to provide broad constraints on the energies of the initiating cosmic rays.

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