Rotation of the Earth during the 1972 Solar Event

Details Rotation of the Earth during the 1972 Solar Event Rotation of the Earth during the 1972 Solar Event

Aug 1973

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1973natur.244..426o&link_type=abstract

Nature, Volume 244, Issue 5416, pp. 426-427 (1973).

Physics

1

Scientific paper

Gribbin and Plagemannn1 have used the UT observations of the US Naval Observatory (USNO) as evidence of ``a discontinuous change in the length of the day and a change in the rate of change of the length of the day'' following a great soalr strom in which the flare activity reached a maximum on August 4, 1972. They claim that variations in the UT observations of the USNO, soon afterwards, have confirmed their own prediction that such a storm should influence the rate of rotation of the Earth. Gribbin also asserts2 that there was a 10 ms jump in AT-UT2 between August 7 and 8. The evidence is presented in the form of graphs of AT-UT2. (UT2 values are the UT observations corrected for observed polar motion and for a seasonal variation in the rate of rotation of the Earth, using the Bureau Internationale de l'Heure (BIH) adopted corrections.) The precise significance of the graphs is difficult to assess because of the irregular indexing of the axes. No mention is made of the instrument or instruments on which the data are based.

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