Estimating the electron energy distribution during ionospheric modification from spectrographic airglow measurements

Details Estimating the electron energy distribution during ionospheric modification from spectrographic airglow measurements Estimating the electron energy distribution during ionospheric modification from spectrographic airglow measurements

Feb 2012

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012jgra..11702317h&link_type=abstract

Journal of Geophysical Research, Volume 117, Issue A2, CiteID A02317

Physics

Plasma Physics

Space Plasma Physics: Active Perturbation Experiments, Space Plasma Physics: Particle Acceleration, Space Plasma Physics: Plasma Energization, Space Plasma Physics: Instruments And Techniques

Scientific paper

The electron energy distribution during an F region ionospheric modification experiment at the HAARP facility near Gakona, Alaska, is inferred from spectrographic airglow emission data. Emission lines at 630.0, 557.7, and 844.6 nm are considered along with the absence of detectable emissions at 427.8 nm. Estimating the electron energy distribution function from the airglow data is a problem in classical linear inverse theory. We describe an augmented version of the method of Backus and Gilbert which we use to invert the data. The method optimizes the model resolution, the precision of the mapping between the actual electron energy distribution and its estimate. Here, the method has also been augmented so as to limit the model prediction error. Model estimates of the suprathermal electron energy distribution versus energy and altitude are incorporated in the inverse problem formulation as representer functions. Our methodology indicates a heater-induced electron energy distribution with a broad peak near 5 eV that decreases approximately exponentially by 30 dB between 5-50 eV.

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