Short- and long-wavelength TIDs generated by the Great American Eclipse of 21 August 2017 and the South American Eclipse of 2ndJuly 2019
Abstract
On the 21stAugust 2017 the shadow of a total eclipse drastically changed the state of the ionosphere over the USA. This effect on the ionosphere is visible in the total electron content (TEC) measured by GNSS. In order to exhaustively explore the ionospheric signature of the eclipse, we use data of total electron content (TEC) from ~3000 GNSS stations seeing multiple GPS and GLONASS satellites to visualize the phenomena. This tremendous dataset allows high-resolution characterization of the frequency content and wavelengths -using an omega-k analysis based on 3D Fast-Fourier-Transform (FFT)- of the eclipse signature in the ionosphere in order to fully identify traveling ionospheric disturbances (TIDs). We confirm the generation of TIDs associated with the eclipse including TIDs interpreted as bow waves in previous studies. Additionally we reveal, for the first time, short (50-100 km) and long (500-600 km) wavelength TIDs with periods between 30 and 65 min (Eisenbeis et al., under review).
On 2ndJuly 2019 a total solar eclipse happened across the South American continent at magnetic conjugate latitudes as the Great American Eclipse, and consequently useful to visualize the different response. Although for the South American eclipse we have only data from more than hundred GNSS stations and located in a zone close to the sunset, we complete our presentation showing the clear evidence of the ionospheric signature of the eclipse (Eisenbeis et al., in preparation).- Publication:
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AGU Fall Meeting Abstracts
- Pub Date:
- December 2019
- Bibcode:
- 2019AGUFMNH33C0919E
- Keywords:
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- 4301 Atmospheric;
- NATURAL HAZARDS;
- 4302 Geological;
- NATURAL HAZARDS;
- 4305 Space weather;
- NATURAL HAZARDS;
- 4315 Monitoring;
- forecasting;
- prediction;
- NATURAL HAZARDS