B. Isham^1,7, M. T. Rietveld^1,2, T. Grydeland³, C. La Hoz³, T. B. Leyser^4,8, F. Honary⁵, M. Kosch², T. Hagfors², H. Ueda⁶

¹EISCAT Scientific Association, Ramfjordmoen, Norway
²Max-Planck-Institut für Aeronomie, Germany
³Auroral Observatory, Tromsø, Norway
⁴University of California, Los Angeles, USA
⁵Lancaster University, UK
⁶Chiba University, Japan
⁷formerly at Interamerican University, Bayamón, Puerto Rico, USA
⁸on leave from the Swedish Institute of Space Physics, Uppsala, Sweden

In November 1999 the EISCAT high-power, high-frequency (HF) facility located near Tromsø, Norway, was used to create artificial plasma turbulence in the ionosphere. During the experiment the EISCAT 224 MHz radar and sometimes the 931 MHz radar were used to obtain measurements of incoherent scatter ion and plasma lines, and artificially-enhanced spectra of E-region plasma waves were measured for the first time at auroral latitudes with both radars. During periods with suitable peak E-region electron density, Z-mode propagation of the HF pump wave to the topside E region occurred, and topside instability-enhanced plasma waves were observed.