fig02.htm

Figure 2. Two typical strong SIDs observed at 13.6 kHz. (top) Event that took place on Omega (Haiku)-Sao Paulo path (d = 12.9  Mm) when the Sun was active, and nearly no effect was found in amplitude. (bottom) Event on Omega (NDAK)-Sao Paulo path (d = 9.35  Mm), showing important amplitude fading under the quiet Sun conditions [Rizzo Piazza and Kauffman, 1975].


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