. "P(OC 271.10), Z(AV0Z3042911)" . "[85D02A7F783E]" . "12"^^ . "RIV/68378289:_____/03:04033542!RIV/2004/AV0/A04004/N" . "Persistence of the planetary wave in the lower ionosphere." . . "The transient planetary waves in the atmosphere and ionosphere seem to occur in the form of bursts of a couple of waves with limited persistence. To study persistence of planetary wave events in the lower ionosphere, data from two radio path from Central Europe are used, Luxenbourgh - Pansk\u00E1 Ves (f=6.09MHz, feq=2.1-2.2 MHz) and Deutschlandfunk - Pansk\u00E1 Ves (f=1539kHz, feq=650-700 k Hz). The absorption along the former radio paths is formed very predominantly at altitudes of about 90-100 km, whereas the latter absorption is formed mostly at altitudes of about 85-90 km. The persistence of planetary wave type oscillations is studied in the three period bands centred at 5, 10 and 16 days. Waves with period T near 5 days reveal a typical persistence of wave events around 5 cycles. Waves with T = 10 days are less persistent with a typical persistence of 3-4 cycles. The typical persistence of waves T = 16 days is no more than 3 cycles. In terms of number of cycles, the persistence of oscollations evidently d" . . "47" . . . "Studia geophysica et geodaetica" . . . . "The transient planetary waves in the atmosphere and ionosphere seem to occur in the form of bursts of a couple of waves with limited persistence. To study persistence of planetary wave events in the lower ionosphere, data from two radio path from Central Europe are used, Luxenbourgh - Pansk\u00E1 Ves (f=6.09MHz, feq=2.1-2.2 MHz) and Deutschlandfunk - Pansk\u00E1 Ves (f=1539kHz, feq=650-700 k Hz). The absorption along the former radio paths is formed very predominantly at altitudes of about 90-100 km, whereas the latter absorption is formed mostly at altitudes of about 85-90 km. The persistence of planetary wave type oscillations is studied in the three period bands centred at 5, 10 and 16 days. Waves with period T near 5 days reveal a typical persistence of wave events around 5 cycles. Waves with T = 10 days are less persistent with a typical persistence of 3-4 cycles. The typical persistence of waves T = 16 days is no more than 3 cycles. In terms of number of cycles, the persistence of oscollations evidently d"@en . "La\u0161tovi\u010Dka, Jan" . . "620637" . . . "CZ - \u010Cesk\u00E1 republika" . "lower ionosphere; planetary waves; persistence"@en . "Novotn\u00E1, Dagmar" . "3"^^ . . "0039-3169" . "RIV/68378289:_____/03:04033542" . "Persistence of the planetary wave in the lower ionosphere."@en . "N/A" . "Persistence of the planetary wave in the lower ionosphere." . "3"^^ . "0"^^ . . "161;172" . "0"^^ . . . . "Kri\u017Ean, Peter" . . "Persistence of the planetary wave in the lower ionosphere."@en . . .