Removal of Nonconstant Daily Variation by Means of Wavelet and Functional Data Analysis

Authors

I. Maslova
P. Kokoszka
Jan Josef Sojka, Utah State UniversityFollow
L. Zhu

Document Type

Article

Journal/Book Title/Conference

Journal of Geophysical Research: Space Physics

Volume

114

Issue

A03202

Publisher

American Geophysical Union

Publication Date

2009

Abstract

We propose a novel approach based on wavelet and functional principal component analysis to produce a cleaner index of the intensity of the symmetric ring current. We use functional canonical correlations to show that the new approach more effectively extracts symmetric global features. The main result of our work is the construction of a new index, which is an improved version of the existing wavelet-based index (WISA) and the old Dst index, in which a constant daily variation is removed. Here, we address the fact that the daily component varies from day to day and construct a “cleaner” index by removing nonconstant daily variations.

Comments

Originally published by the American Geophysical Union. Publisher's PDF available thorough the Journal of Geophysical Research: Space Physics.