Unambiguous evidence of HF pump‐enhanced airglow at auroral latitudes

摘要: Simultaneous observations by up to three low-light imaging stations belonging the Auroral Large Imaging System (ALIS) have provided first strong evidence of high-frequency (HF) pump-enhanced airglow at auroral latitudes. The was enhanced an ordinary mode 4.04 MHz electromagnetic wave with effective radiated power (ERP) about 210 MW that transmitted from EISCAT-Heating facility near Tromso, Norway. While often observed low or mid-latitudes, and despite numerous earlier experiments, no unambiguous been reported On February 16, 1999, successful results were obtained, this paper concentrates on discussing optical data event. Triangulated estimations altitude position are also presented. Auroral-latitude HF important in order better understand underlying excitation mechanisms.