On regularities in long-term solar quiet geomagnetic variations

Details On regularities in long-term solar quiet geomagnetic variations On regularities in long-term solar quiet geomagnetic variations

Jan 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006e%26psl.241..648n&link_type=abstract

Earth and Planetary Science Letters, Volume 241, Issue 3-4, p. 648-654.

Computer Science

Scientific paper

We propose a simple model to describe the behaviour of solar quiet geomagnetic variations Sq over a long time. We assume that Sq variations can be expressed through 24-h components and their harmonics subject to three modulations: 1 year, 11 years and several tens years. We started from the observation that the spectral lines of 30-year geomagnetic data series are split in accordance with yearly modulation. Our model gives good approximation of Sq variations and discloses a striking correlation of amplitudes and phases of modulating functions with the sunspot number and 2.8 GHz solar radio emission. It is also a tool for monitoring the Sq variations.

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