On the conjugacy of TIDs using a large network of GPS receivers in the American sector
Abstract
TEC values measured by several networks of GPS/GNSS receivers are used to investigate the weather activity and dynamics of TIDs in South and Central America during years 2010-2016. Lightning detections gathered by the World Wide Lightning Location Network (WWLLN) are also employed to identify the possible 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 can be between 100 and 300 m/s. During the afternoon and early evening times, TIDs are conjugate, propagate mainly in the North-South direction, and are associated with thunderstorm activity that occurs over the Caribbean and the Andes regions. During the afternoon and early evening times when TIDs are observed mapping from the northern to the southern hemisphere and show conjugate phase velocities. During both solstice seasons, we observed TIDs that do not seem to be conjugate; they occur at magnetic latitudes larger than 20 degrees and have periods less than 60 min. It is possible that these "non-conjugate" TIDs may have conjugate amplitudes below the noise level of TEC measurements (0.1 TEC units). These new results on the conjugacy of TIDs point out the need to use large networks of GPS receivers covering both Northern and Southern hemispheres to characterize TIDs and assess the possible impact of TIDs on seeding equatorial plasma bubbles.
- Publication:
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AGU Fall Meeting Abstracts
- Pub Date:
- December 2019
- Bibcode:
- 2019AGUFMSA23C3133V
- Keywords:
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- 2427 Ionosphere/atmosphere interactions;
- IONOSPHERE;
- 2447 Modeling and forecasting;
- IONOSPHERE;
- 2471 Plasma waves and instabilities;
- IONOSPHERE;
- 2494 Instruments and techniques;
- IONOSPHERE