Two Components of Ionospheric Plasma Structuring at Mid-latitudes during Large Magnetic Storms

Details Two Components of Ionospheric Plasma Structuring at Mid-latitudes during Large Magnetic Storms Two Components of Ionospheric Plasma Structuring at Mid-latitudes during Large Magnetic Storms

Dec 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004agufmsa11b..05b&link_type=abstract

American Geophysical Union, Fall Meeting 2004, abstract #SA11B-05

Other

2411 Electric Fields (2712), 2439 Ionospheric Irregularities, 2471 Plasma Waves And Instabilities, 2736 Magnetosphere/Ionosphere Interactions, 2788 Storms And Substorms

Scientific paper

Analysis of VHF amplitude scintillation and GPS phase fluctuation data in conjunction with global GPS total electron content (TEC) maps, ground-based measurements of daytime aurora and TIMED GUVI images have indicated that there are two distinct plasma processes that give rise to mid-latitude ionospheric irregularities during large magnetic storms. One is associated with auroral plasma processes and the other with storm enhanced density (SED) features which have been shown to be the ionospheric signatures of plasmaspheric tails (Foster et al., GRL, 2002). The auroral nature of one class of events is observed either during local daytime or nighttime conditions depending on the time of storm commencement and the fast rate of decrease of the SYM-H index which is generally an indicator of the rapid development of the ring current and an equatorward movement of the plasmapause. The second class of events is associated with the ionospheric density gradients seen at the edges of SEDs, which frequently occur in conjunction with large northward and westward plasma convection, and are observed primarily in the afternoon-dusk sector. Examples of both classes of events are provided from the large storms that occurred during October 29-31, 2003 and March 31, 2001. Initial results have been published on the SED associated plasma structuring by an ion temperature gradient convective instability (Keskinen et al., GRL, 2004).

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