Magnetospheric convection observed between 0600 and 2100 LT Solar wind and IMF dependence

Details Magnetospheric convection observed between 0600 and 2100 LT Solar wind and IMF dependence Magnetospheric convection observed between 0600 and 2100 LT Solar wind and IMF dependence

Jul 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985jgr....90.6370b&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 90, July 1, 1985, p. 6370-6378.

Physics

32

Convection, Earth Magnetosphere, Interplanetary Magnetic Fields, Magnetic Effects, Solar Terrestrial Interactions, Solar Wind, Earth Ionosphere, Electric Fields, Plasma Drift, Regression Analysis, Viscosity

Scientific paper

Baumjohann et al. (1985) have used GEOS 2 electron gun data to construct average patterns of dayside magnetospheric convection for different levels of magnetic activity. It was found that the synchronous orbit electric field is influenced by both solar wind and ionospheric wind dynamo action. However, it was not possible to decide what fraction of the dawn-to-dusk electric field attributed to a solar wind source was caused by each of the two known solar wind dynamo processes, including viscous interaction and dayside merging. In the present investigation, the GEOS 2 electron gun measurements used in the earlier study are also employed. The data were averaged over one UT hour and combined with solar wind plasma (bulk velocity and proton density) and Interplanetary Magnetic Field (IMF) data. A regression analysis was conducted, taking into account viscous-like interaction, and dayside merging. It is concluded that weak merging electric fields of the order of 0.3 mV/m do exist at the dayside magnetopause even during very quiet times.

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