Abstract
We show examples of newly found fine structures in low-energy (< 1 keV) ion distribution inside the ring current/radiation belt region. They are, from equatorward to poleward, (1) wedge-like energylatitude dispersion of high intensity oxygen, (2) irregular field-aligned low-energy (<200 eV) ion flow, and (3) wavy structures of field-aligned ions. They are primarily observed in the morning sector. The “wedge-like” structure continuously exists for several hours whereas the wavy structure is found when the total background ion intensity is high, i.e., during the main phase of magnetic storms. However, the precise conditions for these phenomena to occur are still unknown.
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