COSMIC Observations of Longitudinal Gradients in the Equatorial Anomaly Region

Details COSMIC Observations of Longitudinal Gradients in the Equatorial Anomaly Region COSMIC Observations of Longitudinal Gradients in the Equatorial Anomaly Region

Dec 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009agufmsa23c..07d&link_type=abstract

American Geophysical Union, Fall Meeting 2009, abstract #SA23C-07

Other

[2415] Ionosphere / Equatorial Ionosphere, [2427] Ionosphere / Ionosphere/Atmosphere Interactions, [2494] Ionosphere / Instruments And Techniques, [2499] Ionosphere / General Or Miscellaneous

Scientific paper

We report observations of the average diurnal variability of longitudinal gradients present in structure in the Equatorial Ionization Anomaly (EIA) based on electron density measurements made by the GPS Occultation Experiment (GOX) instrument aboard the Constellation Observing System for Meteorology, Ionosphere, and Climate (COSMIC/FORMOSAT-3) satellites. We show that the longitudinal modulation of the EIA varies strongly throughout the day and that the modulation is hemispherically asymmetric, producing different longitudinal structures in the northern and southern EIA crests. We have identified the tidal progressions present in the data and show evidence that the DE3 (diurnal eastward propagating tide) is present post dusk but that this tide is replaced by a stationary 4-cell planetary wave, just prior to midnight and that this modulation of the EIA persists throughout the night. Furthermore, we provide evidence of longitudinal modulations having from 1-cell through 6-cell patterns and identify the tidal phase progressions that are responsible for producing the observed EIA modulation. The longitudinal modulation of the EIA varies through the night suggesting that physical mechanisms other than tidal modulation of the E-region dynamo and tidal modulation of the pre-reversal enhancement of the zonal electric field may be important contributors to the modulation of the EIA.

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