Statistics – Computation
Scientific paper
Dec 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011agufmsa43a1878b&link_type=abstract
American Geophysical Union, Fall Meeting 2011, abstract #SA43A-1878
Statistics
Computation
[2403] Ionosphere / Active Experiments
Scientific paper
One of the most prominent features in the SEE spectrum is the so-called down-shifted maximum or DM and broad upshifted maximum or BUM. The DM is believed to be produced from a three-way parametric decay instability from the pump electromagnetic wave into an upper hybrid wave UH and a lower hybrid LH wave. The BUM is believed to be produced from a four-way parametric decay instability which decays the pump into lower hybrid mode together with frequency-upshifted upper hybrid side-band and frequency-downshifted electron Bernstein side-band. Its interesting behavior near third or higher electron gyroharmonics has been well studied and documented now for two decades and it has become important for ionospheric diagnostic purposes. Recent experiments of frequency step around the second gyroharmonic were performed at HAARP to investigate structures developed in the SEE spectra. Some preliminary measurements taken during this frequency stepping around second gyroharmonic experiment are shown in figure below. When the pump frequency is above the second gyro-harmonic an emission of broad upshifted structures is seen. The BUM has been previously observed at third or higher cyclotron harmonic. The objective is to look at the possibilities of previous theory and model of the SEE of higher order of gyro-harmonics applied to the second gyroharmonic SEE. The four wave theoretical and computational model will be used to investigate the upshifted emission lines observed when the pump is above the second gyroharmonic and compare its characteristics with the classic BUM.
Bernhardt Paul A.
Bordikar Maitrayee Ranade
Scales Wayne
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