Composite imaging of convective flows and auroral forms during a substorm cycle

Details Composite imaging of convective flows and auroral forms during a substorm cycle Composite imaging of convective flows and auroral forms during a substorm cycle

Dec 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009agufmsm52b..08s&link_type=abstract

American Geophysical Union, Fall Meeting 2009, abstract #SM52B-08

Physics

[2463] Ionosphere / Plasma Convection, [2704] Magnetospheric Physics / Auroral Phenomena, [2736] Magnetospheric Physics / Magnetosphere/Ionosphere Interactions, [2794] Magnetospheric Physics / Instruments And Techniques

Scientific paper

Measurements obtained with the electronically steerable Poker Flat Incoherent Scatter Radar (PFISR) and a collocated all-sky camera have been used to construct composite images of ionospheric convective flows and auroral forms associated with an isolated substorm on 26 March 2008. The radar was configured to cycle through a 5x5 grid of beam positions. A statistical inversion of line-of-sight velocities was used to construct images of the overlying flow field at 30-km spatial resolution and 1-min time resolution over a 100x100-km field. The flow fields were co-registered with all-sky images recorded at 20-s cadence. Analysis of the composite images has revealed several interesting contrasts between growth-, expansion-, and recover-phase morphology. These include, (1) anti-correlation between ion velocity (electric field) and luminosity (plasma density, hence, conductance) in space and time during growth- and expansion-phases; identical velocities inside and outside the aurora during recovery phase, (2) large tangential velocity directed along auroral boundaries during all phases (consistent with electric field directed into the aurora), irrespective of the orientation of the arc boundary, and (3) large relative drift (~2 km/s) between aurora forms and convective flows during the recovery phase; little or no proper motion during growth phase. The results are interpreted with respect to electrodynamic models of auroral M-I coupling. Composite image showing convective flows (arrows), ion temperature at 200 km (contours), and auroral forms at onset of a pseudo-breakup event.

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