Physics
Scientific paper
Feb 1959
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1959natur.183..526j&link_type=abstract
Nature, Volume 183, Issue 4660, pp. 526-527 (1959).
Physics
21
Scientific paper
As I first pointed out1, the orbital acceleration of artificial Earth satellites shows fluctuations which cannot be explained on gravitational grounds. In satellite 1957 β 1, these oscillations were rather irregular, although cycles of 19 and 37 days could be discerned2,3. According to E. C. Cornford4, a periodicity of about 25 days was indicated, and this gave rise to speculations about possible tidal effects from the Moon. The same hypothesis was tentatively advanced by D. G. King-Hele5 to explain oscillations with a period of 27 days in satellite 1958 δ 1. Earlier3, in collaboration with R. E. Briggs, I had found oscillations with a period of about 30 days in satellite 1958 β 2, but had rejected the tidal hypothesis in view of the many observed irregularities and also because lunar tides should result in oscillations with about half the observed period. It was suggested, rather, that the rotation of the Sun, which has a synodic period of 27 days, could be responsible for changes in upper-atmosphere densities through variable radiation.
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