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We present a study of the RC index as a better representation for characterising rapid variations globally than the Dst index. Using the CM4 model and modifying certain parts of the model allowing us to subtract specific field contributions, we generated the geomagnetic field measurements of interest which we use in calculating the eigenvalues and eigenvectors for combined observatory locations to study the rapid variations seen in our data for days away from quiet time. Result of the eigenanalysis show that the covariance comes between X and Y components of our combined geomagnetic observatory measurements, unlike what obtains in slow and longer variations in single observatory where the covariance is observed between X and Z residuals of the geomagnetic field. Also, the X component of our combined observatory measurement residuals correlates very well with that of the RC index, matching the geomagnetic observatory rapid variation signals of our combined observatories. This good correlation between the X component residuals of our combined observatory measurements and that of the RC index is further confirmed through high cross-correlation coefficients between their residuals which ranges from 0.70 to 0.90 in all the combined observatories studied globally. This suggests that the rapid variation is coming from a large-scale source, possibly the magnetospheric ring current, and the RC index as a good representation for rapid variation globally. © 2018 BBSCS RN SWS. All rights reserved

Usage of RC index as a Good Representation for Characterising Rapid Variation Signals in Geomagnetic Field Studiess