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Magnetic Storm Effects in the auroral ionosphere Observed with EISCAT Radar-Two Case Studies

Wuhan University Journal of Natural Sciences 2000年第2期5卷 181-186页

作者： Liu Hui-xin Ma Shu-ying K. Schlegel College of Electronic Information Wuhan University Wuhan 430072 China Max-Planck Institut für Aeronomie D-37189 Katlenburg-Lindau Germany College of Electronic Information Wuhan University Wuhan 430072 China Wuhan Ionospheric Observatory Wuhan Institute of Physics and Mathematicsthe Chinese Academy of SciencesWuhan 430071 China

Storm-time changes of main plasma parameters in the auroral ionosphere are analyzed for two intense storms occurring on May 15, 1997 and Sept. 25, 1998, with emphasis on their relationship to the solar wind dynamic pressure and the IMFB z component. Strong hard particle precipitation occurred in the initial phase for both storms, associated with high solar wind dynamical pressure. During the recovery phase of the storms, some strong particle precipitation was neither concerned with high solar wind pressure nor southward IMFB z. Severe negative storm effects depicted by electron density depletion appeared in theF-region during the main and recovery phase of both storms, caused by intensive electric field-related strong Joule/frictional heating when IMF was largely southward. The ion temperature behaved similarly inE-andF-region, but the electron temperature did quite different, with a strong increase in the lowerE-region relating to plasma instability excited by strong electric field and a slight decrease in theF-region probably concerning with a cooling process. The field-aligned ion velocity was high and apparently anticorrelated with the northward component of the ion convection velocity.

关键词： magnetic storm auroral ionosphere interplanetary magnetic field particle precipitation Joule heating

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A Simulation Study of Ionization Depletion in the auroral Ionospheric F-Region Caused by Strong Convection Electric Field

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Wuhan University Journal of Natural Sciences 2001年第3期6卷 680-686页

作者： Cai Hong-tao Ma Shu-ying G. Kirchengast College of Electronic Information Wuhan University Wuhan 430072 China

THe effects of strong convection electric field on the electron density in the auroral ionosphericF-region have been simulated numerically by means of a physical model. It is found that an enhancement of electric field directed west-northward in post-noon or west-southward in pre-noon results in an ionization depletion with its maximum at altitudes 40–50 km higher than that of theF 2 peak. When the enhanced electric field lasts for 45 min and has a maximum about 32 mV/m, the resulted ionization depletions reach their maximum at the time just ～10 min behind the time when the convection electric field and ion temperature enhancements reach their maximum. This is consistent well with EISCAT observations. The magnitudes of the percentage ionization depletions and their recovery time are dependent not only on the intensity of the electric field, but also on the diurnal variation phase of the background electron density.

关键词： auroral ionosphere ionospheric model numerical simulation convection electric field ionization depletion

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