Abstract
The experiments relating to the Lyman α radiation observed from rockets in the night sky are reviewed. In part the radiation appears to be solar Lyman a transported by the exosphere below 3 earth radii. However, an important fraction must be attributed also to single scattering in a very extensive envelope of hydrogen moving with the earth out to 50–100 earth radii. The amount of hydrogen needed is about 50 times as much as should be present in the escape component of the exosphere required. The principal problem at present is to account for this hydrogen.
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