Parameterizing the Wind 3DP Heat Flux Electron Data
AIR FORCE RESEARCH LAB HANSCOM AFB MA
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Solar wind heat flux HF electrons are valuable as tracers of the interplanetary magnetic field IMF topology, distinguishing positive from negative solar polarities and indicating the presence of magnetically closed CMEs when the flows are counterstreaming. All past applications of heat fluxes to determine field topologies have been based on visual inspection of color spectrograms of electron pitch angle distributions PADs. However, HF PADs can take a range of shapes and amplitudes, which challenges the visual analysis. We now take a quantitative approach to HF analysis by parameterizing the HF PADs of the UC Berkeley 3DP data with a Fourier harmonic analysis. We have calculated the harmonic cosine coefficients Ao through A4 for a five-year period of the Wind 3DP data set with a lO-min time resolution. With these data we intend to derive quantitative criteria for unidirectional and bi-directional flows and other possible diagnostics of interplanetary field dynamics or configurations. Some initial considerations and results of the 3DP parameterization are presented.