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While contrails often disappear completely in a short period, under certain atmospheric conditions they persist as diffuse cirrus clouds that reflect back terrestrial radiation, with a net warming effect.

These differ from terrestrial radiation sources in that they are high-energy particles rather than electromagnetic waves, e.g., x-rays.

If lab tests are positive, the experiment would then be replicated with a limestone compound which the researchers believe will neither absorb solar or terrestrial radiation, nor deplete the ozone layer.

He is referring to the background levels of ionizing radiation coming from both natural and artificial sources all around us, including radon sources, cosmic radiation from space and terrestrial radiation from the ground.

This could not be reconciled with well-known facts in regard to terrestrial radiation, and it was generally recognized that the result found by Magnus must be erroneous.