Observations of incoherent-scatter plasma-line intensities, measured in the E-region with the European Incoherent Scatter UHF radar, during auroral precipitation, are presented. Intensities up to 200 times the thermal level were observed in a restricted frequency interval from 5.5 to 6.5 MHz. Intensities were lower at both higher and lower frequencies. The intensities are compared with quantitative estimates based on model suprathermal electron fluxes for the prevailing conditions. The minimum in suprathermal electron fluxes between 2 and 4 eV, which is caused by the excitation of vibrational levels in N2, is found to result in a minimum in expected plasma-line damping and a maximum in intensity between 5.5 and 6.5 MHz, for the EISCAT UHF wavelength. Good agreement is found between the calculated and observed intensities. ¿ American Geophysical Union 1995