Geomagnetic Rotational Retardation of Satellite 1959α1(Vanguard II)

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Science  22 Jan 1960:
Vol. 131, Issue 3395, pp. 223-225
DOI: 10.1126/science.131.3395.223


Radio observations made during the battery life of Vanguard II showed that the satellite's rotation was being retarded exponentially at a rapid rate. Precise analysis of electromagnetic couples on the conducting and magnetic parts of the satellite indicates a mean ambient geomagnetic field of 0.158 gauss, and confirms the eddy-current theory previously applied to Vanguard I.