Abstract
The present study analyzes the efficiency of local intermittency measure based on wavelet transforms in identifying solar flare effects on magnetograms. If we observe the flare-time features in geomagnetic components, most often, disturbances associated with other solar phenomena will enhance or mask the solar flare signatures. Similarly, diurnal and high-latitude geomagnetic variabilities will suppress solar flare effects on magnetograms. The measurements of amplitudes taken directly from temporal variations of weak geomagnetic components have certain limitations regarding the identification of the proper base and peak values from which the deviation due to solar flare has to be measured. In such situations, local intermittency measure based on cross-wavelet analysis can be employed which could remarkably identify the flare effects, even if the signatures are weak or masked by other disturbance effects. The present study shows that local intermittency measure based on wavelet analysis could act as an alternate quantification technique for analyzing solar flare effects on geomagnetic activity.
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Acknowledgements
The authors are thankful to NOAA Space Weather Prediction Center (SWPC) for providing GOES X-ray flux archived at the NOAA National Geophysical Data Center (NGDC) (http://www.swpc.noaa.gov/products/goes-x-ray-flux). The authors are also thankful to INTERMAGNET for providing 1-min data of geomagnetic components (www.intermagnet.org). One of the authors SG acknowledges a Junior Research Fellowship (Ac.EVI(4)/17465/JRF/2017) from the University of Kerala, Trivandrum.
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Gopinath, S., Prince, P.R. Investigations into solar flare effects using wavelet-based local intermittency measure. Acta Geophys. 67, 687–701 (2019). https://doi.org/10.1007/s11600-019-00257-7
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DOI: https://doi.org/10.1007/s11600-019-00257-7