auroral boundaries model validation – what has been done
TRANSCRIPT
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Auroral Boundaries Model Validation – What has been done
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Challenge:
Identified boundaries in auroral region from observations and models
Relate boundaries to applications
Look for multi-point observations, multiple crossings, images
Correlations between boundaries associated with different parameters
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Connecting auroral boundaries to important physical parameters/processes in the same region such
- Poynting flux, Joule heating,- field-aligned currents, - total electron content,- Auroral precipitation in different energy ranges, boundaries based on
thresholds.
Key to magnetosphere-ITM coupling.
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Poynting Flux vs Aurora Precipitation
4
Equatorward Poleward
Poleward
Dusk: Eqbn: equatorward disturbance of Poynting fluxPobn: last local maximum on the poleward side
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Nightside: Region 1 FAC vs Aurora Precipitation
12/4/2012 5Ohtani et al., 2009, JGR
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Statistical relationship between FACs and e- precipitationKorth, H., Y. Zhang, B. J. Anderson,T. Sotirelis, and C. L. Waters (2014),Statistical relationship between largescaleupward field-aligned currentsand electron precipitation, J. Geophys.Res. Space Physics, 119, 6715–6731,doi:10.1002/2014JA019961.
Southward IMF: e- precipitation occurred primarily within and near large-scale upward currents. The correspondence less evident for northward IMF.
Better correlation in the dusk sector than other local time sectors between FACs and e- precipitation (due to different physical processes operating in different local time sectors).
Ordered by IMF clock angle
TIMED/GUVIAMPERE