IMAGE Reveals Persistent Features in Plasmasphere.
The IMAGE spacecraft has obtained images of the plasmasphere and ring current during several magnetic storms. During these periods, certain features appear repeatedly along the plasmapause. These features include shoulders, tails, fingers, and other structures involving local time gradients of cold plasma densities. Certain long-standing theories can be tested with the IMAGE data, which have shown, for example, decreases of the energetic neutral atom signature from the ring current that correspond to increases in the cold plasma density.
(2001: Burch, J. L. Mitchell, D. G. Brandt, P. C. Sandel, B. R. Gurgiolo, C)