SINCE the general occurrence of transient radio reflexions the E region of the ionosphere, at frequencie exceeding the critical frequencies for normal or abnormal E layers, was noticed by Sir Edwam ...
Astronomers used to think that only good-sized meteorites reach the earth intact, while the smaller ones “burn” to vapor on passing through the atmosphere. But Dr. H. E. Landsberg at the U.S. Weather ...
On October 9, 1933, when the earth passed through the region occupied eighty days earlier by the faint, short-period comet Giacobini-Zinner, the strongest meteor shower of the century appeared for a ...
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