Discovery of soft X-ray emission from IO, europa, and the IO plasma torus

Ronald F. Elsner, G. Randall Gladstone, J. Hunter Waite, Frank J. Crary, Robert R. Howell, Robert E. Johnson, Peter G. Ford, Albert E. Metzger, Kevin C. Hurley, Eric D. Feigelson, Gordon P. Garmire, Anil Bhardwaj, Denis C. Grodent, Tariq Majeed, Allyn F. Tennant, Martin C. Weisskopf

Research output: Contribution to journalArticle

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Abstract

We report the discovery of soft (0.25-2 keV) X-ray emission from the Galilean satellites Io and Europa, probably Ganymede, and from the Io Plasma Torus (IPT). Bombardment by energetic (greater than 10 keV) H, O, and S ions from the region of the IPT seems to be the likely source of the X-ray emission from the Galilean satellites. According to our estimates, fluorescent X-ray emission excited by solar X-rays, even during flares from the active Sun, charge-exchange processes, previously invoked to explain Jupiter's X-ray aurora and cometary X-ray emission, and ion stripping by dust grains fail to account for the observed emission. On the other hand, bremsstrahlung emission of soft X-rays from nonthermal electrons in the few hundred to few thousand eV range may account for a substantial fraction of the observed X-ray flux from the IPT.

Original languageEnglish (US)
Pages (from-to)1077-1082
Number of pages6
JournalAstrophysical Journal
Volume572
Issue number2 I
DOIs
StatePublished - Jun 20 2002

Fingerprint

Europa
plasma
Io
x rays
Galilean satellites
ion stripping
Ganymede
ion
aurora
Jupiter (planet)
charge exchange
Jupiter
bremsstrahlung
flares
bombardment
sun
energetics
dust
electron
estimates

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science

Cite this

Elsner, R. F., Randall Gladstone, G., Hunter Waite, J., Crary, F. J., Howell, R. R., Johnson, R. E., ... Weisskopf, M. C. (2002). Discovery of soft X-ray emission from IO, europa, and the IO plasma torus. Astrophysical Journal, 572(2 I), 1077-1082. https://doi.org/10.1086/340434
Elsner, Ronald F. ; Randall Gladstone, G. ; Hunter Waite, J. ; Crary, Frank J. ; Howell, Robert R. ; Johnson, Robert E. ; Ford, Peter G. ; Metzger, Albert E. ; Hurley, Kevin C. ; Feigelson, Eric D. ; Garmire, Gordon P. ; Bhardwaj, Anil ; Grodent, Denis C. ; Majeed, Tariq ; Tennant, Allyn F. ; Weisskopf, Martin C. / Discovery of soft X-ray emission from IO, europa, and the IO plasma torus. In: Astrophysical Journal. 2002 ; Vol. 572, No. 2 I. pp. 1077-1082.
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abstract = "We report the discovery of soft (0.25-2 keV) X-ray emission from the Galilean satellites Io and Europa, probably Ganymede, and from the Io Plasma Torus (IPT). Bombardment by energetic (greater than 10 keV) H, O, and S ions from the region of the IPT seems to be the likely source of the X-ray emission from the Galilean satellites. According to our estimates, fluorescent X-ray emission excited by solar X-rays, even during flares from the active Sun, charge-exchange processes, previously invoked to explain Jupiter's X-ray aurora and cometary X-ray emission, and ion stripping by dust grains fail to account for the observed emission. On the other hand, bremsstrahlung emission of soft X-rays from nonthermal electrons in the few hundred to few thousand eV range may account for a substantial fraction of the observed X-ray flux from the IPT.",
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Elsner, RF, Randall Gladstone, G, Hunter Waite, J, Crary, FJ, Howell, RR, Johnson, RE, Ford, PG, Metzger, AE, Hurley, KC, Feigelson, ED, Garmire, GP, Bhardwaj, A, Grodent, DC, Majeed, T, Tennant, AF & Weisskopf, MC 2002, 'Discovery of soft X-ray emission from IO, europa, and the IO plasma torus', Astrophysical Journal, vol. 572, no. 2 I, pp. 1077-1082. https://doi.org/10.1086/340434

Discovery of soft X-ray emission from IO, europa, and the IO plasma torus. / Elsner, Ronald F.; Randall Gladstone, G.; Hunter Waite, J.; Crary, Frank J.; Howell, Robert R.; Johnson, Robert E.; Ford, Peter G.; Metzger, Albert E.; Hurley, Kevin C.; Feigelson, Eric D.; Garmire, Gordon P.; Bhardwaj, Anil; Grodent, Denis C.; Majeed, Tariq; Tennant, Allyn F.; Weisskopf, Martin C.

In: Astrophysical Journal, Vol. 572, No. 2 I, 20.06.2002, p. 1077-1082.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Discovery of soft X-ray emission from IO, europa, and the IO plasma torus

AU - Elsner, Ronald F.

AU - Randall Gladstone, G.

AU - Hunter Waite, J.

AU - Crary, Frank J.

AU - Howell, Robert R.

AU - Johnson, Robert E.

AU - Ford, Peter G.

AU - Metzger, Albert E.

AU - Hurley, Kevin C.

AU - Feigelson, Eric D.

AU - Garmire, Gordon P.

AU - Bhardwaj, Anil

AU - Grodent, Denis C.

AU - Majeed, Tariq

AU - Tennant, Allyn F.

AU - Weisskopf, Martin C.

PY - 2002/6/20

Y1 - 2002/6/20

N2 - We report the discovery of soft (0.25-2 keV) X-ray emission from the Galilean satellites Io and Europa, probably Ganymede, and from the Io Plasma Torus (IPT). Bombardment by energetic (greater than 10 keV) H, O, and S ions from the region of the IPT seems to be the likely source of the X-ray emission from the Galilean satellites. According to our estimates, fluorescent X-ray emission excited by solar X-rays, even during flares from the active Sun, charge-exchange processes, previously invoked to explain Jupiter's X-ray aurora and cometary X-ray emission, and ion stripping by dust grains fail to account for the observed emission. On the other hand, bremsstrahlung emission of soft X-rays from nonthermal electrons in the few hundred to few thousand eV range may account for a substantial fraction of the observed X-ray flux from the IPT.

AB - We report the discovery of soft (0.25-2 keV) X-ray emission from the Galilean satellites Io and Europa, probably Ganymede, and from the Io Plasma Torus (IPT). Bombardment by energetic (greater than 10 keV) H, O, and S ions from the region of the IPT seems to be the likely source of the X-ray emission from the Galilean satellites. According to our estimates, fluorescent X-ray emission excited by solar X-rays, even during flares from the active Sun, charge-exchange processes, previously invoked to explain Jupiter's X-ray aurora and cometary X-ray emission, and ion stripping by dust grains fail to account for the observed emission. On the other hand, bremsstrahlung emission of soft X-rays from nonthermal electrons in the few hundred to few thousand eV range may account for a substantial fraction of the observed X-ray flux from the IPT.

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Elsner RF, Randall Gladstone G, Hunter Waite J, Crary FJ, Howell RR, Johnson RE et al. Discovery of soft X-ray emission from IO, europa, and the IO plasma torus. Astrophysical Journal. 2002 Jun 20;572(2 I):1077-1082. https://doi.org/10.1086/340434