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Published online by Cambridge University Press: 08 February 2017
BiSON currently consists of four fully- and two semi-automated observatories, dedicated to the round-the-clock collection of low-degree (low-l) helioseismological data. A complete historical record of the network can be found in Chaplin et al. (1996). The annual duty cycles achieved by BiSON have improved steadily since our sixth site was commissioned in 1992. Over the period 1992 – 1996 inclusive, we have recorded annual duty cycles of: 54. 68. 78. 74 and 78 per cent respectively.