The change in Sq(H) amplitude on abnormal quiet days.

Details The change in Sq(H) amplitude on abnormal quiet days. The change in Sq(H) amplitude on abnormal quiet days.

Aug 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986geoji..86..467b&link_type=abstract

Geophysical Journal International, Vol. 86, No. 2, p. 467 - 473

Physics

Geomagnetic Field:Interplanetary Magnetic Field, Geomagnetic Field:Variations, Interplanetary Magnetic Field:Geomagnetic Field

Scientific paper

Analysis of geomagnetic data has shown that the superposed northward magnetic field, which reduces the Sq(H) amplitude at northern mid-latitude stations on abnormal quiet days (AQD), and increases the amplitude at stations on the equatorward side of the Sq focus, builds up in amplitude over four to five days before the AQD occurs, and subsides over a similar period after the AQD. It is inferred indirectly that the azimuthal component By of the interplanetary magnetic field varies similarly. Data for the opposite meridian show that the imposed field reverses to a southward direction at lower latitudes. The inferred currents to account for these fields are believed to flow in the ionosphere, but to arise from magnetospheric electric fields induced by the solar wind-transported IMF.

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