Geomagnetic pulsations /5-50 mHz/ and the interplanetary magnetic field

Details Geomagnetic pulsations /5-50 mHz/ and the interplanetary magnetic field Geomagnetic pulsations /5-50 mHz/ and the interplanetary magnetic field

Dec 1976

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976jgr....81.5941w&link_type=abstract

Journal of Geophysical Research, vol. 81, Dec. 1, 1976, p. 5941-5947. Science Research Council

Statistics

Computation

1

Geomagnetic Pulsations, Interplanetary Magnetic Fields, Magnetic Measurement, Cross Correlation, Data Acquisition, Diurnal Variations, Extremely Low Frequencies, Heos Satellites, Radial Distribution, Satellite Observation, United Kingdom

Scientific paper

Geomagnetic pulsations in the 10- to 200-s (Pc 3-4) period range as observed at earth's surface are often seen to switch on and off during the day. Recordings of earth-current measurements made at three stations in the United Kingdom were compared with measurements of the interplanetary magnetic field (IMF) made by the Heos 2 satellite. Some events are presented which show a distinct correlation between enhancements in the radial component of the IMF and the amplitude of pulsations in the period range 20-60 s. Computation of the cross-correlation functions suggests a possible diurnal variation in the delay time between the step observed in the IMF and the enhancement of pulsations at the ground (typically of the order of 15 min). These observations may give important indications of the generation regions of these ULF waves in the magnetosphere.

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