Global Observations of the Effect of a Sustained North-South Oscillation in the IMF

Details Global Observations of the Effect of a Sustained North-South Oscillation in the IMF Global Observations of the Effect of a Sustained North-South Oscillation in the IMF

May 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005agusmsm42a..05n&link_type=abstract

American Geophysical Union, Spring Meeting 2005, abstract #SM42A-05

Physics

2712 Electric Fields (2411), 2760 Plasma Convection, 2784 Solar Wind/Magnetosphere Interactions, 2788 Storms And Substorms, 3304 Atmospheric Electricity

Scientific paper

This paper presents a preliminary study of what appears to be the first IMF event initially identified as interesting on the basis of ground based atmospheric electricity data. On Jan 2, 1993, the electric field mill and air-earth current meters at South Pole Station detected a sustained oscillation in the earth-ionosphere potential at South Pole with a quasi-period of 1 hour and duration of more than 8 hours. Similar oscillations were found in both local and conjugate magnetometer data. This event was recorded all over the earth and by satellite. In addition, the event occurred during the PPB and ELBBO balloon campaigns. Periodic electric field fluctuations associated with the event were observed on most of the balloons. The solar wind and IMF conditions were only available from GEOTAIL, which was located in the magnetosheath at x~-120 Re. The global electrodynamics of the event was modeled using plots generated by AMIE, (Assimilative Mapping of Ionospheric Electrodynamics). The convection pattern variations during the event were a combination of periodic positive turnings of the convection pattern, and periodic intensifications of the electric potential. The auroral energy flux was observed to intensify periodically during the same period, with a major peak at about 1100 UT.

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