John Spencer's Publications

Selected Papers and Preprints

• Enceladus: An active ice world in the Saturn system. J. R. Spencer and F. Nimmo (2013) Ann. Rev. Earth Planet. Sci 41 693-717. PDF format from Annual Reviews. This PDF is for your own personal use. Any further/multiple distribution, publication, or commercial usage of this copyrighted material requires submission of a permission request addressed to the Copyright Clearance Center (http://www.copyright.com/).
• Watery Enceladus. J. R. Spencer Physics Today 64 Nov. 2011, pp. 38-44. PDF/HTML format from AIP. Copyright (2011) American Institute of Physics. This article may be downloaded for personal use only. Any other use requires prior permission of the author and the American Institute of Physics.
• Formation of Iapetus’ extreme albedo dichotomy by exogenically triggered thermal ice migration. J.R. Spencer and T. Denk (2010). Science 327 432-435. Reprint (PDF) - Full Text - Abstract
• Io Volcanism Seen by New Horizons: A Major Eruption of the Tvashtar Volcano. J. R. Spencer, S. A. Stern, A. F. Cheng, H. A. Weaver, D. C. Reuter, K. Retherford, A. Lunsford, J. M. Moore, O. Abramov, R. M. C. Lopes, J. E. Perry, L. Kamp, M. Showalter, K. L. Jessup, F. Marchis, P. M. Schenk, C. Dumas 2007. Science 318, 240-243. HTML or PDF format.
• Cassini encounters Enceladus: Background, and the discovery of a south polar hot spot.  J. R. Spencer, J. C. Pearl, M. Segura, F. M. Flasar, A. Mamoutkine, P. Romani, B. J. Buratti, A. R. Hendrix, L. J. Spilker, and R. M. C. Lopes 2006.  Science 311, 1401-1405. HTML or PDF format.
• The nature of Europa's dark non-ice surface material: Spatially-resolved high spectral resolution spectroscopy from the Keck telescope.  J. R. Spencer, W. M. Grundy, C. Dumas, R. W. Carlson, T. B. McCord, G. B. Hansen, and R. J. Terrile 2006.  Icarus 176, 283-304. PDF format (0.6 MB).
• Mid-infrared detection of large longitudinal asymmetries in Io's SO₂ atmosphere. J. R. Spencer, E. Lellouch, M. J. Richter, M. A. Lopez-Valverde, K. L. Jessup, T. K. Greathouse, and J-M. Flaud 2005. Icarus, 176 283-304. PDF format (1.0 MB).
• The atmospheric signature of Io's Prometheus plume and anti-Jovian hemisphere: Evidence for a sublimation atmosphere. K.L. Jessup, J.R. Spencer, G.E. Ballester, R.R. Howell., F. Roesler, M. Vigil, and R. Yelle 2003. Icarus 169, 197-215. PDF format (1.2 MB).
• Mapping of Io's Thermal Radiation by the Galileo Photopolarimeter-Radiometer (PPR) Instrument. J. A. Rathbun, J. R. Spencer, L. K. Tamppari, T. Z. Martin, L. Barnard, and L. D. Travis 2003, Icarus 169 127-139. PDF format.
• Condensed O₂ on Europa and Callisto. J. R. Spencer and W. M. Calvin 2002, Astron. J. 124, 3400-3403, 2002. PDF format.
• Loki, Io: A periodic volcano. J. A. Rathbun, J. R. Spencer, A. G. Davies, R. R. Howell, and L. Wilson 2002. Geophys. Res. Lett. citation number 1443. PDF format.
• Ground-based observations of volcanism on Io in 1999 and early 2000. Howell, R.R., J.R. Spencer, J. D. Goguen, F. Marchis, R. Prange, T. Fusco, D.L. Blaney, G.J. Veeder, J.A. Rathbun, G.S. Orton, A.J. Grocholsky, J.A. Stansberry, G.S. Kanner, E.K. Hege (2001). J. Geophys. Res. 106, 33129-33139.
• Discovery of Gaseous S₂ in Io's Pele Plume, Science 288, 1208-1210, 2000.
  Full HTML Version | PDF Version | Abstract
• Io's thermal emission from the Galileo Photopolarimeter-Radiometer, Science 288, 1198 - 1201, 2000.
  Full HTML Version | PDF Version | Abstract
• Temperatures on Europa from Galileo PPR: Nighttime Thermal Anomalies. J.R. Spencer, L.K. Tamppari, T.Z. Martin, and L.D. Travis. Science, 284, 1514 - 1516, 1999. Reprints available on request.
• Upper Limits to the Depth of Condensed O2 Absorption Bands on the Icy Saturnian Satellites and Saturn's Rings (now published in Icarus 136, 349-352, 1998).
• The Pele Plume (Io): Observations with the Hubble Space Telescope (now published in Geophys. Res. Lett. 24, 2471-2474, 1997)
• A History of High-Temperature Io Volcanism, February 1995 to May 1997 (now published in Geophys. Res. Lett. 24, 2451-2454, 1997).
• Volcanic Resurfacing of Io: Post-Repair HST Imaging Icarus 127, 221, 1997.