Other
Scientific paper
Sep 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997phdt.........1g&link_type=abstract
Thesis (PHD). BOSTON COLLEGE , Source DAI-B 58/03, p. 1349, Sep 1997, 346 pages.
Other
2
Scientific paper
In order to study the ionospheric plasma convection and field-aligned currents (FAC) associated with auroral arcs at latitudes near the polar cap boundary, simultaneous measurements were made with an all-sky imaging photometer (ASIP) and incoherent scatter radar (ISR) during seven campaigns to Sondrestromfjord, Greenland from 1988 to 1993. Using real-time all-sky images, a unique scanning pattern of the ISR was aligned perpendicular to the arcs to optimize the determination of the component of plasma flow normal to the arc and the detection of shears in the component of plasma flow parallel to the arc. An investigation of five arcs, selected because of their distribution in local time, relatively long duration, and varied morphology revealed two distinct convection patterns. In three cases, the arcs lay along a shear reversal in the tangential component of the plasma flow consistent with ∇cdotE < 0. The velocity of these arcs, which were sun-aligned and caused by relatively soft particle precipitation, tended to be equal to the normal component of the plasma velocity. In the two remaining cases, the arcs were aligned parallel to the auroral oval and occurred during active periods most likely related to auroral substorms. The associated convection patterns were characterized by strong generally antisunward plasma flow across the most poleward arc and a latitudinally narrow region of enhanced eastward plasma flow along the poleward edge of the most poleward arc. The strong antisunward flow across the arc is indicative of a nightside gap in the polar cap boundary and suggestive of magnetospheric reconnection. In all cases, a net upward FAC, generally consisting of an upward-downward FAC pair, was associated with the occurrence of an auroral arc. The specialized experimental and analysis techniques developed herein provide an extensive set of plasma and field measurements that may be used to examine the ionospheric effects of auroral arcs and provide a context for other ground and space-based measurements.
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