Effect of auroral electrojets and solar wind parameters on variations in the intensity of low-latitude geomagnetic disturbances and Dst during the extremely large magnetic storm of November 20-21, 2003

Details Effect of auroral electrojets and solar wind parameters on variations in the intensity of low-latitude geomagnetic disturbances and Dst during the extremely large magnetic storm of November 20-21, 2003 Effect of auroral electrojets and solar wind parameters on variations in the intensity of low-latitude geomagnetic disturbances and Dst during the extremely large magnetic storm of November 20-21, 2003

Jun 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008ge%26ae..48..293s&link_type=abstract

Geomagnetism and Aeronomy, Volume 48, Issue 3, pp.293-306

Computer Science

2

94.30.Kq, 94.30.Lr, Electric Fields, Field-Aligned Currents And Current Systems, And Ring Currents, Magnetic Storms, Substorms

Scientific paper

The effect of auroral electrojets on the variations in the low-latitude geomagnetic disturbances and Dst during a strong magnetic storm of November 20-21, 2003, with Dst ≈ -472 nT has been studied based on the global magnetic observations. It has been indicated that the magnetospheric storm expansive phase with Δ t ≈ 1-2 h results in positive low-latitude disturbances (Δ H) of the same duration and with an amplitude of ˜ 1-2 h results in positive low-latitude disturbances (Δ H) of the same duration and with an amplitude of ˜ 30-100 nT in the premidnight-dawn sector. A growth of negative low-latitude Δ H values and Dst is mainly caused by regular convection electrojets with Δ t ≥ 10 h, the centers of which shift to latitudes of ˜ 50°-55° during the storm development. It has been established that the maximal low-latitude values of the field Δ H component at 1800-2400 MLT are observed when the auroral luminosity equatorward boundary shifts maximally southward during an increase in the negative values of the IMF B z component. It has been assumed that, during this storm, a magnetic field depression at low latitudes was mainly caused by an enhancement of the partially-ring current which closes through field-aligned currents into the ionosphere at the equatorward boundary of the auroral luminosity zone.

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