Annual variation in the surface magnetic field due to magnetospheric current systems

Details Annual variation in the surface magnetic field due to magnetospheric current systems Annual variation in the surface magnetic field due to magnetospheric current systems

Aug 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987angeo...5..239m&link_type=abstract

Annales Geophysicae, Series A - Upper Atmosphere and Space Sciences (ISSN 0980-8752), vol. 5, Aug. 1987, p. 239-245.

Physics

Annual Variations, Geomagnetism, Magnetic Field Configurations, Magnetospheric Instability, Ring Currents, Spherical Harmonics, Diurnal Variations, Magnetoactivity

Scientific paper

The magnetospheric magnetic field model of Tsyganenko is used to compute the annual oscillations in the surface magnetic field during various levels of magnetic activity in the magnetosphere. It is shown that the annual oscillation due to the ring, tail and magnetopause currents appears as a modulation of the diurnal pattern which has both UT and LT components. The diurnal structure of the annual wave in declination is in local time only and it can be used to explain the nature of the observed annual variation in declination at low latitudes.

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