Session 8S - Space.
POSTER session, Thursday afternoon, November 14
Exhibit Hall - Concourse Level, Adam's Mark
Systematic correlation of ELF and VLF signal strenghts with spatial distributions of electrojet and auroral arcs has been investigated in a series of experiments carried out using the HIPAS heater array (f_0 = 2.85 MHz, P_rad \simeq 800 kW). The heater beam was scanned along the magnetic N-S direction and ELF/VLF signals were aquired with the magnetometer setup at Gilmore Creek, AK. Electrojet parameters were obtained from the UAF magnetometer chain and from the HLMS Auroral Radar facility at Elmendorf AFB, and auroral arc positions from the all-sky camera at the Poker Flat Research Range. VLF was generated by AM modulation of the heater beam at 1.11 and 2.5 kHz, while ELF was produced by runnning the heater array in double-frequency (DF) mode at 24 or 29 Hz frequency separation. In some of the experiments simultaneous ELF and VLF modulation was successfully achieved. Preliminary results show strong time-varying dependency of received signals (particulary ELF) with beam zenith angle.