Longitudinal variation of equatorial spread F occurrence over South America

Longitudinal variation of equatorial spread F occurrence over South America

R.Y.C. Cueva (1,2); Valladares, C. (2) ; de Paula, E.R. (1) ; Batista, I.S. (1)

1. Divisão de Aeronomia, Instituto Nacional de Pesquisas Espaciais, São José dos Campos, 12227-10, São Paulo, Brazil
2. Institute for Scientific Research, Boston College, EUA.

12th International Congress of the Brazilian Geophysical Society & EXPOGEF, Rio de Janeiro, Brazil, 15–18 August 2011
doi: 10.1190/sbgf2011-445 

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Abstract:

In this report comparative study has been carried out of the equatorial spread F longitudinal occurrence characteristics analyzing digisonde data from two longitudinally separate stations and TEC GPS data to get the ionospheric conditions that generate spread F irregularities in the SA continent. Digisonde ionospheric parameters were measured to describe the ionospheric local conditions over São Luís (Brazil) and Jicamarca (Peru) stations, and we found a longitudinal/seasonal/ day- to-day variation in these parameters. To support our finding we use TEC GPS data from Low Latitude Ionospheric Sensors (LISN) Network. Using Automatic Bubble Detection Algorithm (ABDA) on TEC data, it was possible to find out bubble signatures (hundreds of kilometers scale size) between September and December months. The bubble occurrence pattern over SA in general follows the characteristics of bubbles detected previously with VHF radar, digisonde and satellite (e.g. DMSP, CHAMP), that are large occurrence on September-October in the west and on December-January in the east. However, we had observed bubble signatures all over the continent among September to December period. Digisonde data from São Luís located at 2.33oS, 44.2oW and 1.3oS dip latitude, and Jicamarca located at 12.4oS, 77.2oW and 1oN dip latitude were used to measure the day-to-day longitudinal variation.

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