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Auroral Intensity and Precipitating
Particle Flux Relationship


Purpose:

Precipitating particle data from the DMSP F12 and F13 satellites has been merged with image intensities from the Ultraviolet Imager (UVI) on the Polar satellite. UVI and EC imagers were combined within single transpolar passes of the DMSP F12 and F13 satellites. Intensities of the pixels were then averaged into 1° x 1° bins along the satellite tracks, thus generating along-track intensity profiles. Similarly, particle data were averaged into 1° bins along the trajectory to form energy precipitation profiles. The inbound (ascending in latitude) and outbound (descending in latitude) peaks in each set of profiles were isolated in order to compare imager photon flux with particle energy flux. The particle data and image intensity data of hundreds of peaks were linearly correlated for January-February 1997 when the northern polar regions were in darkness and dayglow effects were minimal. In the pre-midnight quadrant, good correlations (r ~ 0.80) arise between the photon and electron energy fluxes, while correlations for other sectors are not as good, perhaps because the latter sectors do not present as large a range in energy fluxes of >200 eV particles as the pre-midnight sector. The high correlation in the pre-midnight sector suggests that UVI fluxes can be directly calibrated to measure energy input without the additional complication of modeling. Using this calibration, global maps of energy input into the aurora may be derived empirically.


Documents: (Adobe Acrobat PDF)
Correlation of LBH Intensities with Precipitating Particle Energies
Correlations for 1997 and 1998

For comments, questions, contact J. Carbary, JHU/APL


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