Statistics – Computation
Scientific paper
Dec 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011agufmsa43a1877s&link_type=abstract
American Geophysical Union, Fall Meeting 2011, abstract #SA43A-1877
Statistics
Computation
[2439] Ionosphere / Ionospheric Irregularities, [2447] Ionosphere / Modeling And Forecasting, [2471] Ionosphere / Plasma Waves And Instabilities
Scientific paper
Recent observations of Stimulated Electromagnetic Emission (SEE) during ionospheric heating near the second electron gyro-harmonic frequency at the HAARP facility, show structures ordered by harmonics of ion gyro-frequency. An analytical model is provided in which parametric decay of the pump wave into upper hybrid/electron Bernstein and neutralized ion Bernstein waves is considered. It is shown that for pump wave frequencies near the second electron gyro-harmonic, a band of upper hybrid/electron Bernstein waves separated by harmonics of the ion gyro-frequency is destabilized. Furthermore, a new 2D computational model using the Particle-In-Cell (PIC) method is developed to more thoroughly study nonlinear plasma processes involved in producing these spectral features. Results of the computational model are in acceptable agreement with the outcomes of simplified analytical model. According to the analytical and computational models, ion cyclotron structures in the SEE spectrum depend upon three parameters: 1) the pump field strength, 2) the pump field frequency offset relative to the second electron gyro-frequency and 3) angle of the pump field relative to the background magnetic field. In addition to the analytical and computational models, observational results of a set of experiments that are carried out in the HAARP facilities in the summer student research campaign (SSRC) 2011 to investigate effect of the above mentioned parameter regime on the cyclotron structures are provided and compared to the predictions of the analytical and computational models.
Bernhardt Paul A.
Bordikar Maitrayee Ranade
Fu Haixiang
Samimi A.
Scales Wayne
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