Horizontal Electron Density Gradients Observed by COSMIC TIP

Details Horizontal Electron Density Gradients Observed by COSMIC TIP Horizontal Electron Density Gradients Observed by COSMIC TIP

Dec 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006agufmsa33b0278c&link_type=abstract

American Geophysical Union, Fall Meeting 2006, abstract #SA33B-0278

Physics

0310 Airglow And Aurora, 2415 Equatorial Ionosphere, 2437 Ionospheric Dynamics, 2439 Ionospheric Irregularities, 2494 Instruments And Techniques

Scientific paper

We investigate the drivers of temporal and spatial variability in the large-scale electron density gradients associated with the Appleton anomalies in the low-latitude, nightside ionosphere using a suite of global satellite observations, ground-based measurements, and ionospheric modeling. The processes underlying the variability in the large-scale, nightside electron density gradients are the main drivers of ionospheric weather. We describe the latitudinal separation of the Appleton anomalies, the relative intensity of each ionization crest, the relative width of each anomaly, and the temporal variation of each of these characteristics in response to dynamo and penetration electric fields and neutral winds. We use measurements from the Constellation Observing System for Meteorology Ionosphere and Climate (COSMIC) Tiny Ionospheric Photometer (TIP) instruments to infer the F-region electron density peaks along each satellite track. We relate these large-scale electron density gradients with the smaller scale plasma structures associated with F-region irregularities using scintillation measurements from ground-based GPS receivers. Insight into the drivers of the variability that we expect to observe in the small and large-scale electron density gradients will be gained by forward modeling the observed nightside ionosphere with the SAMI2 (Sami2 is Also a Model of the Ionosphere) model.

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