Co-rotating plasma in the auroral zone

Details Co-rotating plasma in the auroral zone Co-rotating plasma in the auroral zone

May 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agusm..sm52a13p&link_type=abstract

American Geophysical Union, Spring Meeting 2001, abstract #SM52A-13

Physics

2431 Ionosphere/Magnetosphere Interactions (2736), 2437 Ionospheric Dynamics, 2704 Auroral Phenomena (2407), 2764 Plasma Sheet, 2788 Storms And Substorms

Scientific paper

At latitudes sufficiently close to the equator, one typically finds plasma which co-rotates with the earth in a steady manner (on flux tubes which map to the plasmasphere). At higher latitudes, however, such co-rotation is more unusual, and indeed, must be a transient condition on flux tubes which map to the plasma sheet. We show, using electric field data from the FAST spacecraft, and auroral images from Ultraviolet Imager on the Polar spacecraft, several examples of co-rotating plasma within active auroral displays, on flux tubes connected to the plasma sheet. The appearance of transient co-rotating plasma is significant because it demonstrates the development of a strong coupling between the ionosphere and the magnetosphere on substorm timescales. We analyze these examples with respect to substorm phase, and discuss their implications for the dynamics of substorms.

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