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Chandra X-ray Images
of Saturn
A.Bhardwaj et al.)

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(02 Mar 05)
Saturn's Rings Sparkle with X-rays

Credit: X-ray: NASA/MSFC/CXC/A.Bhardwaj et al.; Optical: NASA/ESA/STScI/AURA

Chandra images reveal that the rings of Saturn sparkle in X-rays (blue dots in this X-ray/optical composite). The likely source for this radiation is the fluorescence caused by solar X-rays striking oxygen atoms in the water molecules that comprise most of the icy rings.

As the image shows, the X-rays in the ring mostly come from the B ring, which is about 25,000 kilometers wide and is about 40,000 kilometers (25,000 miles) above the surface of Saturn (the bright white inner ring in the optical image). There is some evidence for a concentration of X-rays on the morning side (left side, also called the East ansa) of the rings. One possible explanation for this concentration is that the X-rays are associated with optical features called spokes, which are largely confined to the dense B ring and most often seen on the morning side.

Spokes, which appear as radial shadows in the rings, are due to transient clouds of fine ice-dust particles that are lifted off the ring surface, and typically last an hour or so before disappearing. It has been suggested that the spokes are triggered by meteoroid impacts on the rings, which are more likely in the midnight to early morning hours because during that period the relative speed of the rings through a cloud of meteoroids would be greater.

The higher X-ray brightness on the morning side of the rings could be due to the additional solar fluorescence from the transient ice clouds that produce the spokes. This explanation may also account for other Chandra observations of Saturn, which show that the X-ray brightness of the rings varies significantly from one week to the next.

Fast Facts for Saturn:
Credit  X-ray: NASA/MSFC/CXC/A.Bhardwaj et al.; Optical: NASA/ESA/STScI/AURA
Scale  At the time of this observation, the angular diameter of the disk of Saturn was 20.5 arcsec.
Category  Solar System
Observation Dates  April 14, 2003; January 20, 2004; January 26, 2004
Observation Time  30 hours
Obs. IDs  3725, 4466, 4467
Color Code  Energy (X-ray = blue)
Instrument  ACIS
References A. Bhardwaj et al. The Astrophysical Journal, 627:L73, 2005 July 1 also astro-ph
Release Date  June 27, 2005