Observations of Aspect Sensitive SPEAR-Induced Enhancements in Incoherent Scatter Spectra

Details Observations of Aspect Sensitive SPEAR-Induced Enhancements in Incoherent Scatter Spectra Observations of Aspect Sensitive SPEAR-Induced Enhancements in Incoherent Scatter Spectra

May 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007agusmsa51a..07d&link_type=abstract

American Geophysical Union, Spring Meeting 2007, abstract #SA51A-07

Physics

Plasma Physics

7800 Space Plasma Physics, 7803 Active Perturbation Experiments, 7839 Nonlinear Phenomena (4400, 6944), 7868 Wave/Wave Interactions

Scientific paper

RF-induced plasma instabilities excited by the Space Plasma Exploration by Active Radar (SPEAR) facility give rise to characteristic spectral enhancements in incoherent scatter spectra recorded by the EISCAT Svalbard Radar (ESR), which is collocated with SPEAR. The SPEAR-induced ion and plasma line enhancements are consistent with excitation of both the purely growing mode and the parametric decay instability. The aspect sensitivity of these enhancements provides valuable information regarding the physical processes that occur within the SPEAR-affected ionospheric patch. We present observations of spectral enhancements from several directions in the magnetic meridian plane, centred on field-aligned. These direction-dependent signatures demonstrate significant variability and help shed light on possible coupling between artificial field-aligned irregularities generated at the upper-hybrid height and SPEAR-induced instabilities excited near the reflection height for O-mode-polarized radio waves.

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