ISSN:
1476-4687
Source:
Nature Archives 1869 - 2009
Topics:
Biology
,
Chemistry and Pharmacology
,
Medicine
,
Natural Sciences in General
,
Physics
Notes:
[Auszug] It has been demonstrated, however, that the night-time ionization at heights around the upper boundary of the Earth-ionosphere waveguide, for VLF waves, may contain an appreciable contribution from the stronger celestial X-ray sources2'3, and, indeed, long-term observations confirm the influence of ...
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1038/2281080a0
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