Radio wave propagation and ionisation of meteoric constituents

摘要: WE have studied from Calcutta (22°34′N; 88°24′E) the effect of meteoric ionisation on radio wave propagation characteristics in low frequency band, where most aids for aerial and marine navigation operate. For past few years we been recording during daytime field strength a navigational signal 280 kHz (call sign JR) transmitted Jessore (23°10′N; 89°10′E), about 110 km Calcutta. Preliminary results indicated that meteors can produce significant below ionospheric regions around 85 responsible reflection signal, causing sizeable absorption events major meteor shower activities1,2. Here present new obtained detailed analysis data periods showers one year period June 1972 to May 1973, which indicate dissipation ionised trail produced along path depends ionic characteristic trail.