Coordinated Observations of Proton Aurorae from Ground and Space

Physics

Scientific paper

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2494 Instruments And Techniques, 2704 Auroral Phenomena (2407), 0310 Airglow And Aurora, 2455 Particle Precipitation

Scientific paper

Nighttime observations of the spectral characteristics of proton auroral emissions have been made using ground based equipment from time to time for many decades. This report documents the first time that ground-based observations are accompanied by space-based global imaging of the proton aurora, here obtained by the Spectrographic Imager aboard NASA's IMAGE satellite. The ground-observations were made from Poker Flat, Alaska, in January, 2001. The instrumentation consisted of a Fabry-Perot interferometer, constructed such that monochromatic light around 486.1 nm (Hβ ) produces 3 distinct fringes on the CCD. The incoming light passes through a filter with a 3-nm passband filter centered near 486.1 nm. The multi-channel imaging from IMAGE-FUV locates the ground imager in the context of the proton and electron auroral ovals, and subsequent development of substorm onset and expansion/recovery phase. The ground-based element of this experiment provides a quantifiable improvement, as an independent means for determination of precipitating proton energy.

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