Prominent sporadic sodium (Nas) layers, apparently associated with intense auroral activity, were observed during the 1993 Arctic Noctilucent Cloud Campaign (ANLC-93) with an airborne sodium lidar on the August 6 flight near 51 ¿N latitude. The peak density of the Nas layer reached 74,500 cm-3. The zonal extent of the Nas layers exceeded 1600 km. Strong auroral emissions were recorded with an all-sky imager on the aircraft. A Michelson Interferometer was used to measure the intensity of OH nightglow between 85--90 km. OH rotational temperature exhibited no obvious correlation with the Nas layer peak density near 94 km. The data suggest a connection between the Nas layers and auroral electron precipitations. The data also support the conjecture that dust and smoke particles may play a crucial role in the Nas layer formation. ¿ American Geophysical Union 1995