On the local time dependence of annual and semiannual modulations of geomagnetic disturbance field.

Periodic analyses of H and Z are presented, and it is verified that the annual and quasi‐biennial waves in H and Z can be caused by dynamo effects. Such waves need not appear in the spectra of geomagnetic activity indexes, such as Ap. An estimate of the annual wave in H produced by the annual wave in ionospheric wind speed yields a reasonable amplitude. It is suggested that the quasi‐biennial oscillation in H and Z is also caused by ionospheric winds.

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On the local time dependence of annual and semiannual modulations of geomagnetic disturbance field.

Abstract: by BHARGAVA (1972b, c).

Cited by 2 publications

References 8 publications

Solar cycle modulation of the constituents of geomagnetic field at Alibag

Solar cycle modulation of the constituents of geomagnetic field at Alibag

The influence of long-period dynamo region winds on the surface geomagnetic field elements

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