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The solar and lunar daily geomagnetic variation of declination at Trevandrum, 1853–1869

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Summary

The eye readings of easterly declination at Trevandrum observatory have been analysed to determine solar and lunar daily vatiations. Hourly readings during February 1853 to February 1865 are analysed by Chapman-Miller method. The 8 values read at unequidistant day-time hours during March 1865 to December 1869 are analysed to compute the amplitude and phase of the semimonthly wave at each of the hours separately. The semi-monthly lunar wave obtained from the hourly readings shows a considerable night-time variation. A brief discussion of the results is also given.

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Authors and Affiliations

  1. High Altitude Observatory, National Center for Atmospheric Research, Boulder, Colorado, USA

    Sydney Chapman

  2. Geophysical Institute, University of Alaska, College, Alaska, USA

    Sydney Chapman

  3. Earth Physics Brach, Energy Mines and Resource, Ottawa, Canada

    Jagdish Chandra Gupta

Authors
  1. Sydney Chapman
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  2. Jagdish Chandra Gupta
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Contributions from the Earth Physics Branch, No. 323

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Chapman, S., Gupta, J.C. The solar and lunar daily geomagnetic variation of declination at Trevandrum, 1853–1869. PAGEOPH 87, 93–101 (1971). https://doi.org/10.1007/BF00878911

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  • DOI: https://doi.org/10.1007/BF00878911

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