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

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

Dec 1971

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1971papge..87...93c&link_type=abstract

Pure and Applied Geophysics PAGEOPH, Volume 87, Issue 1, pp.93-101

Physics

Geophysics

3

Scientific paper

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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