Multi-instrument Observations of the Development of the Equatorial Ionization Anomaly and Links to Scintillation

Details Multi-instrument Observations of the Development of the Equatorial Ionization Anomaly and Links to Scintillation Multi-instrument Observations of the Development of the Equatorial Ionization Anomaly and Links to Scintillation

Dec 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004agufmsa33a1130m&link_type=abstract

American Geophysical Union, Fall Meeting 2004, abstract #SA33A-1130

Physics

2415 Equatorial Ionosphere, 2437 Ionospheric Dynamics, 2439 Ionospheric Irregularities, 2447 Modeling And Forecasting

Scientific paper

During the geomagnetically quiet month of March 2002, scintillations in the Pacific sector (Manila, Singapore and Guam) were observed on most nights. There are several nights, however, where scintillations were not observed at one or more of these locations. In this study we investigate the development of the Equatorial Ionization Anomaly (EIA) in the Pacific sector and relate the results back to the occurrence/non-occurrence of scintillations at these longitudes. Space-based and ground-based measurements of the electron densities are used in order to obtain an understanding of the large-scale structure of the low-latitude ionosphere during the early evening hours when the conditions for scintillations are set up. The study includes TEC measurements from TOPEX and GPS ground stations, in situ electron density measurements from the DMSP satellites, and electron densities derived from UV line-of-sight radiances from both TIMED-GUVI, and the LORAAS instrument aboard the ARGOS satellite. The Global Assimilation of Ionospheric Measurements (GAIM) model is used to assimilate these measurements into a global model of the ionosphere for the days of interest. The model provides estimates of the ionospheric specification and is used to fill in the gaps in longitude and time that are not covered by the measurement data. We present both measurement and model data for several days in March 2002 and discuss factors that may modulate the development of scintillation.

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