پاورپوینت Verification of forecasts of Cbs 

نوع فایل: پاورپوینت

قابل ویرایش 38 اسلاید

Background on lightning detection system (Sferics) used to perform verification

Results of verification

Conclusions/Recommendations

System detects the vertical component of electromagnetic radiation generated by a lightning discharge at around 13 kHz (VLF) received at a number of `sensor’ sites

Strong EM emissions around 13 kHz

Caused by rapid neutralisation of charge, in the lowest few hundred metres of C-G stroke

Atmospheric attenuation minima close to 13 kHz

The atmoSFERIC wave can propagate over thousands of kilometres along the earth / ionosphere waveguide

12 sensors in the current network connected to Exeter by communication links

Received digitised waveforms sent to the Flash Location Processor (FLP) via a Data Collection System (DCS) located in a `fire-walled’ DMZ

Location of a `flash’ or `fix’ determined by the Arrival Time Differences (hence ATD)

Differences between at least 4 sensor out-stations are used to calculate lightning position by iterative method