Ionospheric Anomalies in the Polar Cap and at Mid-Latitudes Revealed by Digital Ionosondes and GPS Receivers

Details Ionospheric Anomalies in the Polar Cap and at Mid-Latitudes Revealed by Digital Ionosondes and GPS Receivers Ionospheric Anomalies in the Polar Cap and at Mid-Latitudes Revealed by Digital Ionosondes and GPS Receivers

May 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009agusmsa24a..05p&link_type=abstract

American Geophysical Union, Spring Meeting 2009, abstract #SA24A-05

Physics

2431 Ionosphere/Magnetosphere Interactions (2736), 2435 Ionospheric Disturbances, 2443 Midlatitude Ionosphere, 2463 Plasma Convection (2760), 2475 Polar Cap Ionosphere

Scientific paper

Intensification of the magnetosphere-ionosphere coupling during magnetic storms driven by coronal mass ejections (CMEs) or corotating interaction regions (CIRs) lead to extreme disturbances in density and height of ionospheric plasma layers. Dramatic enhancements of the ionospheric density and plasma content (TEC) appear in mid-latitude ionosphere and extend into the polar cap in the form of continuous tongue of ionization and/or isolated plasma patches. These ionospheric anomalies affect propagation of radio waves and microwave GPS signals and can be detected by various ground-based instruments. Using few CIR- and CME- driven geomagnetic storms of the last solar maximum as examples it will be demonstrated how the ionospheric anomalies evolve globally in time and space during the storms. The tomographic 4D inversions of the GPS data acquired by ground network of dual-frequency GPS receivers will be compared with the measurements of plasma drift and density obtained by digital ionosondes which now compose the Canadian High Arctic Ionospheric Network (CHAIN).

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