Extreme TGF Imaging by ASIM
Abstract
One year after the starting of ASIM operational phase, we have succeeded to perform accurate Imaging of 35 TGF. Among them, some have been analysed at extreme imaging conditions in terms of TGF position at the MXGS partially coded field of view. 5 TGF events with angular distance larger than 40º respect to the MXGS FOV centre, are presented and discussed. In three cases, the associated WWLLN data validates the footprint positions.
Last part of the presentation is the discussion of a TGF with a very large and asymmetric probability distribution at the MXGS FOV that suggest the TGF as an extended source. Imaging results projected to the Earth surface and compared with GOES data, shows that the TGF is at the edge of a very large convective cell 100 km in diameter, located north of the TGF position in good agreement with imaging data map. Therefore, we can conclude that for some bright TGF it is possible to estimate the TGF fireball dimensions generated by large iterations of TGF photons with atmospheric asymmetric matter distributions. In this case, the presence of a large CZT tail of 340-microsecond duration is coherent with the size of the convective cell.- Publication:
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AGU Fall Meeting Abstracts
- Pub Date:
- December 2019
- Bibcode:
- 2019AGUFMAE41A..08V
- Keywords:
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- 3304 Atmospheric electricity;
- ATMOSPHERIC PROCESSES;
- 3324 Lightning;
- ATMOSPHERIC PROCESSES;
- 4301 Atmospheric;
- NATURAL HAZARDS