Determination of the excitation threshold for Magnetized Stimulated Brillouin Scatter (MSBS) using HAARP facilities

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[2403] Ionosphere / Active Experiments

Scientific paper

In recent HAARP heating experiments, it has been shown that during the Magnetized Stimulated Brillouin Scattering MSBS instability, the pumped electromagnetic wave will decay into an electromagnetic wave and a low frequency electrostatic wave (either ion acoustic IA wave or electrostatic ion cyclotron EIC wave). According to the matching condition, the O-mode electromagnetic wave can excite either an ion-acoustic wave with a frequency less than the ion cyclotron frequency for propagation along the magnetic field or an electrostatic ion cyclotron (EIC) wave just above the ion cyclotron frequency that propagates at angle with respect to the magnetic field. Using Stimulated Electromagnetic Emission (SEE) spectral features, side bands which extend above and below the pump frequency can yield significant diagnostics for the modified ionosphere. It has been shown that the ion acoustic frequency offsets can be used to measure electron temperature in heated ionosphere and SBS can be used as a sensitive method to determine the ion species by measuring ion mass using the ion gyro frequency offset. In this presentation the result of SEE experiment at 2010 PARS summer school will be presented. The experiment was done at the 3rd gyro harmonic with frequency sweeping, power stepping and transmitter angle variation. Three diagnostics were implemented to study the SEE. There were 1) A 4 channel spectrum analyzer SEE receiver, 2) the University of Alaska SuperDARN radar facility and, 3) the MUIR incoherent scatter radar. The experimental results aimed to show the threshold for transmitter power to excite IA wave propagating along the magnetic field line as well as for EIC wave while transmitter antenna pointed in angle with respect to magnetic field. According to the initial analysis on the data, the excitation of IA wave was observed as will be described.

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