University of Kansas

X-Ray Emission in the Solar System

Image: Jovian soft X-rays from ROSAT; courtesy of J. H. Waite.

X-Ray Emission in the Solar System

X-ray emission has been observed from many objects throughout the solar system including the Sun, the Moon, the Earth, Jupiter, and comets. The initial discovery of X-rays from comet Hyakutake (Lisse et al., 1996) was surprising, and a number of explanations were put forth, including bremsstrahlung associated with hot electron collisions with cometary neutrals or ions, scattering or fluorescence of solar X-rays from cometary neutrals or from dust particles, and charge transfer of heavy solar wind ions with neutrals (Cravens, 1997). X-rays have also been observed both from Jupiter's auroral region as well as from low latitudes (Waite et al., 1997a,b). Again, a number of emission mechanisms have been proposed, including precipitation of energetic heavy ions from the magnetosphere (Cravens et al., 1995). Predictions of X-ray emission from Venus, Mars, and from interstellar neutrals in the heliosphere have also been made. The Space Physics group at the University of Kansas is working on X-ray emission in the solar system, and this web site includes a number of papers and preprints on this topic.

References: Cravens, T. E., J. Geophys. Res., 100, 17153 (1995); Cravens, T. E., Geophys. Res. Lett., 24, 105 (1997); Lisse, C., et al., Science, 274, 205 (1996); Waite, J. H., et al., Science, 276, 104 (1997a); Waite, J. H., et al., Adv. Space Res., 20, 243 (1997b).

Publications:

2006-Present

  • On Lunar Exospheric Column Densities and Solar Wind Access Beyond the Terminator from ROSAT Soft X-ray Observations of Solar Wind Charge Exchange, M. R. Collier, S. L. Snowden, M. Sarantos, M. Benna, J. A. Carter, T. E. Cravens, W. M. Farrell, S. Fatemi, H. Kent Hills, R. R. Hodges, M. Holmström, K. D. Kuntz, F. Scott Porter, A. Read, I. P. Robertson, S. F. Sembay, D. G. Sibeck, T. J. Stubbs, P. Travnicek, and B. M. Walsh, J. Geophys. Res.-Planets, 119, 1459, doi:10.1002/2014JE004628, 2014. Abstract and link to full article.

  • The Origin of the Local 1/4 keV X-ray Flux in Both Charge Exchange and a Hot Bubble, M. Galeazzi, M. Chiao, M. R. Collier, T. Cravens, D. Koutroumpa, K. D. Kuntz, R. Lallement, S. T. Lepri, D. McCammon, K. Morgan, F. S. Porter, I. P. Robertson, S. L. Snowden, N. E. Thomas, Y. Uprety, E. Ursino, and B. M. Walsh, Nature, 512, 171, doi:10.1038/nature13525, 2014. Full article available here.

  • Solar Wind Charge Exchange and Local Hot Bubble X-Ray Emission with the DXL Sounding Rocket Experiment, M. Galeazzi, M. Collier, T. E. Cravens, D. Koutroumpa, K. D. Kuntz, S. Lepri, D. McCammon, F. S. Porter, K. Prasai, I. Robertson, S. Snowden, N. E. Thomas, and Y. Uprety, Astronomische Nachrichten, 333, 383, doi:10.1002/asna.201211665, 2012. Abstract and link to full article.

  • Solar Wind Charge Exchange During Geomagnetic Storms, I. P. Robertson, T. E. Cravens, D. G. Sibeck, M. R. Collier, and K. D. Kuntz, Astronomische Nachrichten, 333, 309, doi:10.1002/asna.201211671, 2012. Abstract and link to full article.

  • What Can Be Learned from the Absence of Auroral X-Ray Emission from Saturn?, Yawei Hui, T. E. Cravens, Nataly Ozak, and D. R. Schultz, Journal of Geophysical Research, 115, A10239, doi:10.1029/2010JA015639, 2010. Abstract and link to full article.

  • Auroral X-Ray Emission at Jupiter: Depth Effects, N. Ozak, D. R. Schultz, T. E. Cravens, V. Kharchenko, and Y.-W. Hui, Journal of Geophysical Research, 115, A11306, doi:10.1029/2010JA015635, 2010. Abstract and link to full article.

  • Solar Wind Charge Exchange Contributions to the Diffuse X-Ray Emission, T. E. Cravens, I. P. Robertson, S. Snowden, K. Kuntz, M. Collier, and M. Medvedev, in The Local Bubble and Beyond II, edited by K. D. Kuntz, S. L. Snowden, and R. K. Smith, AIP Conference Proceedings, vol. 1156, p. 37, doi:10.1063/1.3211832, 2009. Abstract and link to full article.

  • The Heliospheric Contribution to the Soft X-Ray Background Emission, I. P. Robertson, K. D. Kuntz, M. R. Collier, T. E. Cravens, and S. L. Snowden, in The Local Bubble and Beyond II, edited by K. D. Kuntz, S. L. Snowden, and R. K. Smith, AIP Conference Proceedings, vol. 1156, p. 52, doi:10.1063/1.3211834, 2009. Abstract and link to full article.

  • Spectral Morphology of the X-Ray Emission from Jupiter's Aurorae, G. Branduardi-Raymont, R. F. Elsner, M. Galand, D. Grodent, T. E. Cravens, P. Ford, G. R. Gladstone, and J. H. Waite Jr., Journal of Geophysical Research, 113, A02202, doi:10.1029/2007JA012600, 2008. Abstract and link to full article.

  • Latest Results on Jovian Disk X-Rays from XMM-Newton, G. Branduardi-Raymont, A. Bhardwaj, R. Elsner, R. Gladstone, G. Ramsay, P. Rodriquez, R. Soria, H. Waite, and T. E. Cravens, in Highlights in Planetary Science, 2nd General Assembly of the Asia Oceania Geophysical Society, edited by A. Bhardwaj, W. Ip, and T. Encrenaz, Planetary and Space Science, 55, pp. 1126-1134, doi:10.1016/j.pss.2006.11.017, 2007. Abstract and link to full article.

  • A Study of Jupiter's Aurorae with XMM-Newton, G. Branduardi-Raymont, A. Bhardwaj, R. F. Elsner, G. R. Gladstone, G. Ramsay, P. Rodriquez, R. Soria, J. H. Waite Jr., and T. E. Cravens, Astronomy and Astrophysics, 463, 761, doi:10.1051/0004-6361:20066406, 2007. Abstract and link to full article.

  • X-rays from Solar System Objects, A. Bhardwaj, R. Elsner, R. Gladstone, T. E. Cravens, C. M. Lisse, K. Dennerl, G. Branduardi-Raymont, B. Wargelin, J. H Waite Jr., I. Robertson, N. Ostgaard, P. Beiersdorfer, S. L. Snowden, and V. Kharchenko, in Highlights in Planetary Science, 2nd General Assembly of the Asia Oceania Geophysical Society, edited by A. Bhardwaj, W. Ip, and T. Encrenaz, Planetary and Space Science, 55, pp. 1135-1189, doi:10.1016/j.pss.2006.11.009, 2007. Abstract and link to full article.

  • X-Ray Emission from the Terrestrial Magnetosheath Including the Cusps, I. P. Robertson, M. R. Collier, T. E. Cravens, and M.-C. Fok, Journal of Geophysical Research, 111, A12105, doi:10.1029/2006JA011672, 2006. Abstract and link to full article.

  • X-Ray Emission from the Outer Planets: Albedo for Scattering and Fluorescence of Solar X-Rays, T. E. Cravens, J. Clark, A. Bhardwaj, R. Elsner, J. H. Waite Jr., A. N. Maurellis, G. R. Gladstone, and G. Branduardi-Raymont, Journal of Geophysical Research, 111, A07308, doi:10.1029/2005JA011413, 2006. Abstract and link to full article.

2000-2005

Prior to 2000


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Last modified October 27, 2014
T. Hunt-Ward
tizby@ku.edu