Anomalous Nighttime Plasma Structure in the Recovery Phase of a Superstorm

Details Anomalous Nighttime Plasma Structure in the Recovery Phase of a Superstorm Anomalous Nighttime Plasma Structure in the Recovery Phase of a Superstorm

Dec 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005agufmsa21a0275m&link_type=abstract

American Geophysical Union, Fall Meeting 2005, abstract #SA21A-0275

Other

2431 Ionosphere/Magnetosphere Interactions (2736), 2441 Ionospheric Storms (7949)

Scientific paper

During intense geomagnetic storms, observations of total electron content using orbiting Global Positioning System receivers and spaceborne radar altimeters suggest that large-scale and large-magnitude dayside increases in ionospheric total electron content can occur within a few hours after the onset of solar wind conditions leading to the storm. Particular storms showing this feature are: October 29, 2003, October 30, 2003, and November 7, 2004. Another feature that has emerged in the study of these superstorms is the presence of significant post-dusk localized TEC enhancements over mid-latitudes, during the recovery phase of the storm, that persist until dawn. We will present measurements from ground and space-based GPS receivers that reveal the characteristics of these localized features, where they appear, their persistence and other characteristics. We speculate that these features are difficult to reproduce using existing models of the Earth's ionosphere in the absence of solar radiation to generate plasma. Nevertheless, they may have significant impact on GPS-based navigation systems affected by the ionosphere.

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