Statistics – Applications
Scientific paper
May 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agusm..sa41a01g&link_type=abstract
American Geophysical Union, Spring Meeting 2001, abstract #SA41A-01 INVITED
Statistics
Applications
2407 Auroral Ionosphere (2704), 2431 Ionosphere/Magnetosphere Interactions (2736), 2455 Particle Precipitation, 2494 Instruments And Techniques
Scientific paper
Energetic electrons and protons precipitating from the magnetosphere are a major energy source in the high latitude regions inducing significant ionospheric and thermospheric perturbations through ionization and heating. Aurora is the optical manifestation of the interaction of these energetic particles with atmospheric neutrals. It can be used as remote sensing of the particle characteristics for estimation of the subsequent atmospheric response or for tracking magnetospheric precesses. Imaging from space offers a unique way to access to the global picture, and its temporal varibility, of the particle energy input over the auroral ovals. Usually only the electron component of the precipitation is considered. Electron characteristics are inferred from the analysis of auroral images taken from space in two different spectral bands in UV or visible. Applications to substorm study will be presented. If overall most of the energy is carried by electrons, at some locations and certain times protons are a major energy source, that is, a major ionization source of the atmosphere. The proton component is retrieved from the Doppler-shifted H emissions, a unique signature of proton precipitation. The contribution of energetic protons to non-H emissions will be estimated. Analysis of auroral images to infer both electron and proton characteristics will be presented. The validation and limitations of auroral analysis will be dicsussed, as well as the need and relevance of global auroral imaging for both ionospheric and magnetospheric communities.
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