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Date: 11/21 (Thu)
Time: 14:45-16:30
Place: 8-1-03
Speaker: Purwadi
Title:
"Thunderstorm Observation System Development using Ground Lightning Detection Network and Thermal Infrared Sensor Camera onboard LAPAN-A4"

Abstract:
"Thunderstorm clouds has potential disaster risk such as heavy rain, lightning, hail and occasionally tornadoes. These clouds form when warm air currents rise above the Earthfs surface. These Previous study shows that both thunderstorms growth speed and lightning activity can be used to indicate its activity status and may be used to predict the potential hazards of this clouds. In this study, we are going to establish observation system for thunderstorm activity using ground lightning detection network and thermal infrared sensor (TIS) camera on board LAPAN-A4. Some progress of this study will be presented in this EOU seminar.
Ground lightning detection networks in very low frequency (VLF) range has been established in Philippines, Palau, Guam, Japan, and Indonesia. The data obtained by these lightning detection networks can be used to estimate the lightning location using Time of Arrival method. In this study, geolocation error is predicted by simulation and confirmed using statistical method. We are going to used this lightning data to analyze the thunderstorm clouds. Progress analysis of typhoon Trami in western north Pacific will be presented. We trace the energy suplies of the typhoon by assuming the number of lightning which is swept by wind entering to the center of typhoon. We suspect that the energy suplies indicated by number ligtning will have corelation with maximum wind speed of typhoon. Progress analysis of small scale thunderstorm cloud in Kalimantan will also be presented.

TIS camera has been successfully developed by Hokaido University and passed some environmental testing such as vibration testing, vacuum testing, thermal testing and EMC testing. Thermal calibration of this TIS camera also has been done. This TIS camera will be installed on LAPAN-A4 satellite which will be launched in 3rd quarter of 2020. In the future, this TIS camera will be used to monitor cloud top height by assuming the surface temperature of the cloud follow the ambient temperature. By observing in some interval time, cloud growth speed can be calculated." 
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