IMAGE/HENA: Examples of Ring Current Configuration During Extreme Solar
Wind Conditions

Pontus C Brandt 1 (240-228-3837; pontus.brandt@jhuapl.edu)
Don G Mitchell 1 (donald.mitchell@jhuapl.edu)
Robert Demajistre 1 (robert.demajistre@jhuapl.edu)
Edmond C Roelof 1 (edmond.roelof@jhuapl.edu)

1 Johns Hopkins University Applied Physics Laboratory , 11100 Johns Hopkins Rd,
Laurel, MD 20723-6099, United States 

We will give an overview over different examples of ring current
configurations during extreme values of interplanetary magnetic field
(IMF) By and Bz. The 15 July 2000 storm displayed IMF Bz down to -60 nT
and a subsequent formation of a ring current close to the Earth. The 12
August 2000 displayed IMF By=30 nT and Bz=-30 nT with an entry point of
the flow during the mainphase highly skewed towards dawn which may be an
effect of plasma entry along the dawnside flanks of the magnetopause due
to the highly positive IMF By. We will present the ion distributions
inverted from the ENA image sequences through a method by R. Demajistre
et al. at this conference and give lower limits on the current density.