Quasi-biennial geomagnetic variation caused by the sun

Details Quasi-biennial geomagnetic variation caused by the sun Quasi-biennial geomagnetic variation caused by the sun

Nov 1976

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976georl...3..643s&link_type=abstract

Geophysical Research Letters, vol. 3, Nov. 1976, p. 643-646.

Mathematics

Logic

5

Digital Filters, Geomagnetism, Magnetic Variations, Magnetospheric Instability, Secular Variations, Solar Activity Effects, Atmospheric Temperature, Cosmic Rays, Meteorological Parameters, Ozone, Stratosphere, Time Dependence, Wind Effects

Scientific paper

Clear evidence for the existence of a quasi-biennial geomagnetic variation is shown by an analysis of annual averages of the horizontal (H) component of the geomagnetic field observed at five observatories. The analysis uses a numerical filter, which is equivalent to taking the second order time derivative of the time series. The cause for the variation is external to the earth because its amplitude depends on magnetic activity. The second order time derivative of H is well correlated with the corresponding time derivatives of the relative sunspot number and 10.7 cm solar flux. It is suggested that quasi-biennial oscillations observed in the geomagnetic field, cosmic rays, stratospheric zonal wind and temperature, total ozone, and other meteorological parameters could be produced by a common cause on the sun.

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