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Scientific paper
Aug 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992phdt.........9m&link_type=abstract
Ph.D. Thesis Instituto de Pesquisas Espaciais, Sao Jose dos Campos (Brazil).
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1
Atmospheric Electricity, Energy Transfer, Geomagnetism, Interplanetary Magnetic Fields, Magnetic Field Reconnection, Magnetic Storms, Magnetopause, Ring Currents, Solar Terrestrial Interactions, Solar Wind, Stellar Mass Ejection, Current Sheets, Density Distribution, Heliosphere, International Sun Earth Explorer 3, Interplanetary Medium, Plasma Density, Plasma Temperature, Solar Corona, Solar Wind Velocity
Scientific paper
Geomagnetic storms are related to the ring current, which is driven by energy injection primarily during energetic solar wind-magnetosphere coupling due to reconnection at the magnetopause. This work identified the interplanetary origins of moderate geomagnetic storms (-100 nT less than or equal to Dst(MIN) less than -50 nT) and analyzed the coupling processes during the storm main phase. For this purpose the interplanetary magnetic field, solar-wind temperature, density and velocity data, obtained by the ISEE-3 satellite, were used together with the equatorial-Dst and auroral-AE geomagnetic indices, provided by the World Data Center, for the interval August/1978 - December/1979. 78 moderate storms were identified, in which 40 storm events (Dst beginning at approximately 0 nT) were selected. Related to these well defined events the following interplanetary origins were found: coronal mass ejections phenomena - CME (40 percent related to interplanetary shocks; 22.5 percent to single streams; 17.5 percent to streams interactions; 10 percent to non-compressive density enhancement) and non-CME phenomena (7.5 percent related to Alfven-like waves and 2.5 percent to no-identified feature). 47 percent of CME-phenomena occurred near the heliospheric current sheet. Regarding the main-phase development all energy coupling functions showed a similar behavior, that is, the south component of the interplanetary magnetic field (in the magnetospheric coordinate frame) controls basically this coupling. The best linear fits were given by Ey electric field-like and epsilon electric power-like functions. However the complexities in these coupling relations point to other simultaneous energy transfer processes such as non-proportional transference, viscous transference, and 'unloading' process.
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