VLF DETECTION OF FIREBALLS

The results from 80 hours of simultaneous visual/video and VLF recordi ngs made during the Lyrids, Perseids, Orionids, Leonids and Geminids a re presented, All meteor magnitudes from -11 to +4 have been sampled a t least once during these observations. The only positive VLF fireball detection was made at 19:57:32 UT on August 11, 1993 from the South o f France, We present a Fourier transform analysis of this event and we also derive a lower limit to the electrical field strength produced b y the fireball at the antenna, Our present observations suggest a lowe r limit of M(v) approximate to -10 +/- 1 for a fireball to produce a V LF signal.