Abstract
Abstract. The utility of fuzzy set theory in cluster analysis and pattern recognition has been evolving since the mid 1960s, in conjunction with the emergence and evolution of computer technology. The classification of objects into categories is the subject of cluster analysis. The aim of this paper is to employ Fuzzy-clustering technique to examine the interrelationship of geomagnetic coastal and other effects at Indian observatories. Data from the observatories used for the present studies are from Alibag on the West Coast, Visakhapatnam and Pondicherry on the East Coast, Hyderabad and Nagpur as central inland stations which are located far from either of the coasts; all the above stations are free from the influence of the daytime equatorial electrojet. It has been found that Alibag and Pondicherry Observatories form a separate cluster showing anomalous variations in the vertical (Z)-component. H- and D-components form different clusters. The results are compared with the graphical method. Analytical technique and the results of Fuzzy-clustering analysis are discussed here.
Highlights
IntroductionThere is an obvious annual increase in amplitude during the summer months and a seasonal shift of the maximum early in summer and late in winter for solar quiet day (Sq) variations at middle- and low-latitude stations (Campbell, 1997)
Geomagnetic quiet day (Sq) variations have been widely analyzed by many scientists
Quiet day mean hourly variations of the geomagnetic field have been utilized to study the solar control of the low-latitude quiet day magnetic field (Bhargava and Rangarajan, 1979) and local time and solar cycle features of the day-to-day variability in horizontal intensity (Bhargava and Yacob, 1969 and 1974); in addition, daily variations at low latitudes (Rastogi, 1992) and daily variations at low latitudes associated with stable solar wind flow (Rangarajan, 1981), etc., have been analyzed based on geomagnetic quiet day variations at Indian observatories
Summary
There is an obvious annual increase in amplitude during the summer months and a seasonal shift of the maximum early in summer and late in winter for solar quiet day (Sq) variations at middle- and low-latitude stations (Campbell, 1997). Quiet day mean hourly variations of the geomagnetic field have been utilized to study the solar control of the low-latitude quiet day magnetic field (Bhargava and Rangarajan, 1979) and local time and solar cycle features of the day-to-day variability in horizontal intensity (Bhargava and Yacob, 1969 and 1974); in addition, daily variations at low latitudes (Rastogi, 1992) and daily variations at low latitudes associated with stable solar wind flow (Rangarajan, 1981), etc., have been analyzed based on geomagnetic quiet day variations at Indian observatories
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