Sudden Commencements and Impulses in Kodaikanal magnetograms -their hourly frequency

Authors

  • B. SRINIVASAMURTHY

DOI:

https://doi.org/10.54302/mausam.v10i2.4052

Abstract

The diurnal variation in the frequencies of sudden commencements (SCs) and sudden impulses (SIs) at Kodaikanal (10.2°N, 77.5°E) is analysed from the data for the period 1949-1957.The hourly frequency curve of SCs and SIs (combined) has little resemblance to the curve obtained by Newton from his analysis of Greenwich-Abinger record. The results of harmonic analysis show a nearly semi-diurnal trend the distribution of storm sudden commencements (SSCs); this, however, is small. The hourly frequencies of SIS  show s significant diurnal variation with an afternoon maximum and a forenoon maximum and a secondary minimum around 18h local time and a secondary maximum around 08h. These results are also compared with those obtained by Ferraro Parkinson and Unthank.

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Published

01-04-1959

How to Cite

[1]
B. SRINIVASAMURTHY, “Sudden Commencements and Impulses in Kodaikanal magnetograms -their hourly frequency”, MAUSAM, vol. 10, no. 2, pp. 209–212, Apr. 1959.

Issue

Vol. 10 No. 2 (1959): MAUSAM

Section

Shorter Contribution

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