f The Trimpi Events Detection Experiment At Comandante Ferraz Brazilian Antarctic Station And The Statistical Analysis Of Its Seasonal Variation

Since 1995 the Comandante Ferraz Brazilian Antarctic Station, located at King George Island (620 34’ S; 580 23,5’<br>W), has participated of an International Programme in the Antarctica Peninsula with the objective of to image<br>and to locate the local and ephemeral sub-ionospheric VLF disturbances induced by lightning in the opposite<br>hemisphere, know as Classical Trimpi Events, in order to better understand its physical mechanisms. For this<br>proposal was installed at C. Ferraz TVLF (Tuneable Very Low Frequency) receivers specially designed for<br>Stanford University, CA, USA, to detect this phenomenon. The equipment is composed by two orthogonal loop<br>antennas (1.4 m2 area) connected to 6 TVLF narrow band receiver channels with 10 ms temporal accuracy. After<br>the initials adjustments the system is in continuos operation since March 1996 with good noise/signal rates. The<br>first Brazilian Trimpi data analysis for a complete seasonal variation period is presented here.