Relationship between magnetospheric energy sources and ionospheric variability during the substorm cycle

Details Relationship between magnetospheric energy sources and ionospheric variability during the substorm cycle Relationship between magnetospheric energy sources and ionospheric variability during the substorm cycle

Dec 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003agufmsa21c..07s&link_type=abstract

American Geophysical Union, Fall Meeting 2003, abstract #SA21C-07

Physics

2407 Auroral Ionosphere (2704), 2431 Ionosphere/Magnetosphere Interactions (2736), 2435 Ionospheric Disturbances, 2716 Energetic Particles, Precipitating

Scientific paper

Magnetospheric substorms produce intense localized perturbations in the ionosphere as a result of the dissipation of electromagnetic and kinetic energy. The true spatial-temporal variability of the ionospheric response is not captured by space-borne auroral imagers, nor by ground-based magnetometers, nor by coherent backscatter radars. Efforts to assimilate these diagnostics into a coherent picture of electrodynamic coupling are inherently unreliable during active periods. The undersampled variability cannot be treated as an averaging effect since the underlying physics is itself scale-dependent (e.g., Alfvenic versus inverted-V versus diffuse aurora). This paper considers the relationship between the magnetospheric energy source and small-scale ionospheric variability during the substorm cycle. A combination of space-borne measurements from FAST and IMAGE, and IS radar and optical measurements from the Sondrestrom facility is used to identify changes in the ionospheric plasma state (Te, Ti, Ne, Vi, and ion production rate) with respect to specific features in the magnetospheric source, thereby resolving the scale dependent physics. Implications for various approaches to modelling high-latitude MI coupling are discussed.

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