Statistical Study of TIDs using Several Network of GPS Receivers and Tropospheric Sensors
Abstract
LISN is a distributed observatory that consists of a network of 35 GPS receivers, five VIPIR ionosondes, and six magnetometers all of them installed within the South American continent. TEC values measured by LISN and several other networks of GPS/GNSS receivers are used to investigate the climatology, location and dynamics of TIDs in South and Central America for years 2010-2016. Lightning detections gathered by the World Wide Lightning Location Network (WWLLN), rainfall information measured with the Tropical Rainfall Measuring Mission (TRMM) satellite, and stratospheric wind values provided by the Modern Era Retrospective-Analysis for Research and Applications (MERRA) are employed to identify the source of atmospheric gravity waves (AGWs) that produce TIDs in the ionosphere. TIDs are observed every day; they contain scale sizes that vary between 300 and 1500 km, and velocities that fluctuate between 100 and 300 m/s. Seasonal statistics of the TID occurrence suggests the presence of three different populations. The first type of TIDs occurs during the day. They map to the opposite hemisphere and are associated with convective cells that evolve in South America. The second type develops during the northern hemisphere summer season and is produced by tropical storms and the Inter Tropical Convective Zone (ITCZ), these TIDs do not seem to map to the opposite hemisphere. The third and last type of TIDs grows between November and February months. These TIDs are conjugate and associated with thunderstorm activity that occurs near the Andes during the rainy season (November through March). These results point out the need to use flux tubes that connect and map both Northern and Southern hemispheres when characterizing TIDs.
- Publication:
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AGU Fall Meeting Abstracts
- Pub Date:
- December 2018
- Bibcode:
- 2018AGUFMSA13A..01V
- Keywords:
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- 0355 Thermosphere: composition and chemistry;
- ATMOSPHERIC COMPOSITION AND STRUCTUREDE: 2427 Ionosphere/atmosphere interactions;
- IONOSPHEREDE: 7894 Instruments and techniques;
- SPACE PLASMA PHYSICSDE: 7959 Models;
- SPACE WEATHER