Physics – Plasma Physics
Scientific paper
Dec 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010agufmsa31c..08n&link_type=abstract
American Geophysical Union, Fall Meeting 2010, abstract #SA31C-08
Physics
Plasma Physics
[2403] Ionosphere / Active Experiments, [6929] Radio Science / Ionospheric Physics, [7803] Space Plasma Physics / Active Perturbation Experiments, [7944] Space Weather / Ionospheric Effects On Radio Waves
Scientific paper
Experiments designed to understand the behavior of the E region Artificial Field Aligned Plasma Density Irregularities (AFAIs) were performed using the split array at HAARP, during the summer of 2010. The resulting irregularities were diagnosed using a 30Mhz coherent scatter radar. AFAIs were generated using O-mode and O+X modes at different power levels. Results show that the X-mode suppresses the O-mode AFAIs and the degree of suppression is strongly related with the irregularities involved. The O-mode AFAIs were totally suppressed when the thermal ocillating two stream instabilities were excited (Figure 1). However, the O-mode AFAIs were partially suppressed when the heating power levels allowed the presence of trapped waves (Figure 2). Figure 1. Range-time Doppler intensity plot of backscatter from E region AFAIs over HAARP. The second panel is the average of the SNR. Each heating cycle corresponds to an amplitude-modulated pulse, sweeping from 0 to 18% of the HAARP full power. O-mode generation was used for the first 4min., followed by 1-minute rest and 4 minutes using a combination of O-mode and X mode generation. The total suppression of the second pulse is observed.
Figure 2. These AM pulses sweep between 0 and 90 % of HAARP full power, in a similar scheme as Figure 1. A decrease in the intensity of the O + X mode pulse is observed.
Hysell Dave L.
Nossa E.
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