Data Example, VELOX Power spectrum plot
Example Data, VELOX Power spectrum plot

  Power spectrum plot of Halley VELOX data for 24 hours (18 January 1995). Colour represents mean log power in dB above an absolute reference level of 10-33 T2 Hz-1 for channels 1-8. The highest frequency channel is dominated by 'spherics' (lightning noise). Two SCEs (Smith, 1996) are seen at around 0350UT and 0450UT, with dawn chorus beginning from ~0730UT. Polar hiss (cusp noise) is observed around local noon (15UT), and we also note some "dropouts" (Smith, 1995), notably at ~1720UT.

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