ISSN:
1476-4687
Source:
Nature Archives 1869 - 2009
Topics:
Biology
,
Chemistry and Pharmacology
,
Medicine
,
Natural Sciences in General
,
Physics
Notes:
[Auszug] IONOSPHERIC absorption of cosmic noise in polar regions (called polar cap absorption) is believed to be caused by ionization of the upper atmosphere by fast protons (in the energy-range of 10-50 MeV.) emitted from the Sun after a big flare1 2. Direct balloon observations of protons have confirmed ...
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1038/186610a0
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