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Instantaneous auroral particle energy deposition as determined by optical emissions
Author(s) -
Murphree J. S.,
Anger C. D.
Publication year - 1978
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/gl005i006p00551
Subject(s) - photometer , flux (metallurgy) , deposition (geology) , atmospheric sciences , satellite , longitude , range (aeronautics) , physics , albedo (alchemy) , energy flux , photon , environmental science , latitude , optics , materials science , geology , astronomy , art , paleontology , sediment , performance art , metallurgy , composite material , art history
Remote sensing of the N 2 + ING 3914Å auroral emission using data from the Auroral Scanning Photometer onboard the ISIS‐2 satellite is employed to determine the energy deposition rate of auroral particles. Techniques have been developed for removing the effects of ground albedo and for obtaining integrated intensities even when the emission region is visible only at the earth's limb. Data from 9 northern hemisphere passes have been selected to illustrate the variation in energy deposition rate with magnetic activity. Measured photon flux rates (photons sec −1 deg −1 of longitude) vary from ∼2 × 10 22 to 1.9 × 10 25 . The peak photon flux for a given pass can occur at magnetic local times varying from 21 to 05 hours. The inferred range of global energy deposition rates (for electron energies 30 eV and above) is 4 × 10 16 to 1 × 10 19 ergs sec −1 .