Difference in the current-voltage relationships between dawn and duskside inverted-V events

摘要: We analyze 81 Freja inverted-V events to study the current-volt age relationship in different magnetic local time sectors. use data from F7 (TESP) electron detector. The are categorized according current-voltage so that categories named U, C, and O current j increases, is constant, or decreases with voltage V, respectively. find U C most common on eveningside, while category dominates morningside. Globally, least common. Besides density, we also behavior of source plasma density temperature as a function each nearly constant category, slightly strongly O. linearly correlated behaves rather uniformly all categories. suggest there may be an important physical difference between morningside eveningside discuss possible explanations terms auroral potential structure models.