Abstract
A PROGRAMME for the analysis of IGY data from magnetic observatories for luni–solar variations has recently been extended to the observatory at Tananarive, Madagascar (18° 55′ S., 47° 33′ E.). This site is of particular interest because it lies at dip latitude ϕ = −34.8° (tan ϕ = ½ tan I, where I is the magnetic dip). No data between ϕ = −24° (St. Helena, D only) and ϕ = −47° (Cape Town, Hermanus) have previously been analysed. In addition Tananarive is an inland observatory, so it is unlikely to have an anomalous luni–solar variation in Z, as is the case for coastal observatories1.
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References
Malin, S. R. C., Geophys. J. Roy. Astro. Soc. (in the press).
Leaton, B. R., Malin, S. R. C., and Finch, H. F., Roy. Obs. Bull., No. 63 (1962).
Chapman, S., and Miller, J. C. P., Mon. Not. Roy. Asho. Soc. Geophys. Suppl., 4, 649 (1940).
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MALIN, S. Luni–Solar Daily Variations of the Geomagnetic Field at Tananarive during the International Geophysical Year. Nature 215, 719–720 (1967). https://doi.org/10.1038/215719b0
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DOI: https://doi.org/10.1038/215719b0
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