Magnetosphere-ionosphere coupling processes in inverted-V electron precipitation regions have been investigated using particle and magnetic field data obtained from two antarctic sounding rockets S-310JA-11, and S-310JA-12, launched into quiet and active auroral arcs, respectively. These data have suggested the presence of a linear relation between field-aligned current and field-aligned potential difference, i.c., j∥=KV∥, given by Fridman and Lemaire [1980> and Lyons [1980>. The density n and thermal energy E0 of primary electrons have been obtained by fitting accelerated Maxwellian distribution functions to the observed electron energy spectra. It is found that the thermal energy E0 is larger inside the arcs than outside the arcs for both the quiet and active arcs observed, suggesting that precipitating electrons are heated during the field-aligned acceleration. In contrast, the electron density n is enhanced outside the arcs for the quiet arc event, while it is enhanced inside the arcs for the active arc event. From an investigation of the relation between E0 and V∥ and also the relation between E0 and j∥, it is suggested that the heating occurs effectively when the current intensity exceeds a certain threshold and that the electron heating rate is 5--40% of the energy gain due to the field-aligned acceleration. Assuming that this heating is due to the Joule heating through anomalous resistivity, it is also suggested that the total anomalous resistivity along the magnetic field line decrease with an increase of K. ¿ American Geophysical Union 1990