ISSN:
1476-4687
Source:
Nature Archives 1869 - 2009
Topics:
Biology
,
Chemistry and Pharmacology
,
Medicine
,
Natural Sciences in General
,
Physics
Notes:
[Auszug] ON March 7, 1970, we observed the K and F solar corona photographically at El Gramel, Oaxaca, Mexico. The technique has already been explained1'2, but has been improved since the 1968 experiment in Siberia. By using a graded filter?the neutral radial attenuator technique ?photographs were obtained ...
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1038/2261141a0
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