High above the earth's atmosphere, 6,000 to 11,000 miles above its surface, whirls a great ring of invisible gas. This is the belief of Geophysicist Sydney Chapman, formerly of Oxford. He cannot prove conclusively that the ring is there, but strong theoretical reasons have convinced him that it exists.
The ring is not made of dust particles like the rings of Saturn; it consists of hydrogen whose atoms have been ionized, i.e., broken into protons and electrons. The ring as a whole is electrically neutral since the amounts of positive protons and negative electrons...
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