| Example ionogram produced by the Halley dynasonde on 26 March 1994 at 23:10 UT. The F-region is shown by a clear O-mode (red) and X-mode (green) trace starting at 240km, although "spread-F" conditions are also evident indicating horizontal structure in the electron density. A "second hop" is seen starting at 480km suggesting that the main trace is situated overhead at Halley. Less well-defined traces are seen between 300km and 450km resulting from off-vertical echoes and multiple reflections. | ||
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