Mid-latitude Spread-F and Large Magnetic Storm-Driven Nighttime Flows

Details Mid-latitude Spread-F and Large Magnetic Storm-Driven Nighttime Flows Mid-latitude Spread-F and Large Magnetic Storm-Driven Nighttime Flows

Dec 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agufmsa52a..09b&link_type=abstract

American Geophysical Union, Fall Meeting 2008, abstract #SA52A-09

Physics

2411 Electric Fields (2712), 2431 Ionosphere/Magnetosphere Interactions (2736), 2437 Ionospheric Dynamics, 2439 Ionospheric Irregularities, 2443 Midlatitude Ionosphere

Scientific paper

Plasma structuring at mid-latitudes causing spread-F on ionograms and VHF/UHF scintillations can have unexpected impacts on GPS signals at L-band if these events occur in a background of large magnetic storm-driven nighttime flows. Two such storm results are presented. The common distinguishing feature of both storms has been the absence of appreciable storm-enhanced density or total electron content (TEC) gradients, which are generally observed in the afternoon sector; rather, the mid-latitude region was enveloped by the auroral oval and the ionospheric trough, within which the sub auroral polarization stream (SAPS) was confined during the local dusk to nighttime hours. The intense flow channel in the ionosphere was revealed by both space and ground-based measurements, through DMSP over-flights and Dynasonde drifts. The competing effects of irregularity amplitude ÄN/N, the background F-region density and the magnitude of SAPS or auroral convection are discussed in establishing the extent of the region which can impact GPS-based navigation systems such as the Wide Area Augmentation System (WAAS) that operates in the North American sector.

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