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Old 02-08-2013, 12:30 PM   #57
mhgaffney
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The discovery of cometary x-rays

In 1996 scientists expressed surprise when they detected the first evidence that comets produce x-rays. They had no expectation that ice balls could do this. If you doubt the shock of this major discovery -- check out this report:
http://heasarc.gsfc.nasa.gov/docs/rosat/hyakutake.html

It took NASA several years to explain the phenomenon. But James McCanney had already offered an explanation even before the discovery was made. Indeed -- McCanney had predicted the discovery -- based on his plasma discharge comet model. McCanney actually contacted NASA and urged them to turn on their instruments during the passage of comet Hyakutake. But of course -- they ignored him.

The discovery was made by accident.

In 2000 NASA announced that the x-rays were produced by ions from the sun - and indeed this may be a partial explanation.
http://chandra.harvard.edu/press/00_...ss_072700.html

Notice -- the x-rays are produced on the sunward side of the comet --
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