Other
Scientific paper
Sep 1975
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975jgr....80.3705c&link_type=abstract
Journal of Geophysical Research, vol. 80, Sept. 1, 1975, p. 3705-3708.
Other
2
Geomagnetic Pulsations, Harmonic Analysis, Magnetohydrodynamic Waves, Magnetospheric Instability, Propagation Modes, Standing Waves, Ats 1, Histograms, Satellite Observation, Synchronous Satellites
Scientific paper
Low-frequency oscillations of the earth's magnetic field recorded by a magnetometer on board ATS 1 have been examined for the 6-month interval between January and June 1968. Using evidence from OGO 5 and ATS 5 as well as the data from ATS 1, it is argued that the dominant mode at ATS 1 must be the fundamental rather than the second harmonic of a standing Alfven wave. It is concluded that these transverse oscillations are more accurately associated with magnetically disturbed days than with quiet days. From 14 instances when oscillations of distinctly different periods occurred during the same time interval at ATS 1, it is also concluded that higher harmonics can exist. The period ratio in seven of the 14 cases corresponds to the simultaneous occurrence of the second harmonic with the fundamental, and four other cases could be identified as the simultaneous occurrence of the fourth harmonic with the fundamental.
Countee C.
Cummins W. D.
Lyons Daniel
Wiley III W.
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