Ground Detection of Gyro Resonant Plasma Waves During High Power Radio Waves Experiments at HAARP (Invited)

Details Ground Detection of Gyro Resonant Plasma Waves During High Power Radio Waves Experiments at HAARP (Invited) Ground Detection of Gyro Resonant Plasma Waves During High Power Radio Waves Experiments at HAARP (Invited)

Dec 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010agufmsa31c..02b&link_type=abstract

American Geophysical Union, Fall Meeting 2010, abstract #SA31C-02

Other

[2403] Ionosphere / Active Experiments, [2483] Ionosphere / Wave/Particle Interactions

Scientific paper

High power radio waves transmitted from the ground can enter the ionosphere and become transformed into electrostatic waves by mode coupling or parametric decay. The decay products may be electromagnetic (EM) waves that propagate to the ground and are detected by ground receivers. The decay products may also be electrostatic waves that are mode converted to EM waves for propagation to ground receivers. The EM signals have frequency offsets from the EM pump wave and are called stimulated electromagnetic emissions (SEE). The production of SEE requires five factors for excitation. First, the EM pump wave must have sufficient amplitude in the ionosphere to excite the parametric decay process. Second, the EM pump wave must propagate to a region where it can couple into a resonant mode of the plasma. Third, the large amplitude EM or ES resonant mode drives a parametric decay instability to generate two other resonant modes in the plasma. Fourth, at least one resonant mode in the plasma must be weakly damped. Fifth, the high frequency daughter wave of the parametric decay process may need to be converted into an electromagnetic wave to be received on the ground. In the framework of these five criteria, the production of stimulated ion Bernstein (SIB) emissions is considered for an electromagnetic pump wave tuned to the second harmonic of the electron cyclotron frequency. For maximum pump amplitude, the plasma frequency should be nearly equal to the pump frequency. This double resonance occurs if the EM pump frequency is tuned to match the frequency at the altitude where the plasma frequency in the plasma layer is equal to twice the electron gyro frequency. The double resonance of pump frequency equals plasma frequency equals twice the electron gyro frequency insures that a large amplitude standing wave is formed at the point where the pump electric field can couple into the electron Bernstein resonance at twice the electron cyclotron frequency. The theory for generation of electrostatic by the stimulated electron/ion Bernstein (SEIB) instability has been verified with ground observations of SEE at the HAARP facility in Alaska. The electron Bernstein wave can also decay into another electron Bernstein wave and a lower-hybrid wave. Decay products such as electron Bernstein waves can efficiently accelerate electrons in the ionosphere by cyclotron resonance. The SEE measurements compared with optical and electron density measurements show a strong correlation of Bernstein modes and electron acceleration.

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