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Activity Number: 11 - Statistical Inference for Solar and Geophysical Data
Type: Invited
Date/Time: Monday, August 3, 2020 : 10:00 AM to 11:50 AM
Sponsor: Section on Physical and Engineering Sciences
Abstract #309327
Title: Hitting a Moving Target: Modeling Non-Stationary Relationships in Geomagnetism
Author(s): David Riegert* and David J Thomson and Glen Takahara
Companies: Queen's University and Queen's University and Queen's University
Keywords: nonstationary; time series; signal processing; spectrum; magnetotellurics; transfer function

This talk focuses on modelling the relationship between Earth's magnetic field as a predictor and induced currents in the ground as a response; a field of study known as magnetotellurics. Current modelling approaches assume a stationary relationship, however energy transfer between frequencies, indicating non-stationarity in the process, has been investigated in the univariate setting using seismic, ocean pressure (Chave et al., 2019), and geomagnetic measurements (Chave et al., 2018; Riegert & Thomson, 2018). Non-stationarity in a time-series process provides strong evidence for a non-stationary relationship between that series and any other. Current models are discussed and an extension is introduced which aims to account for violations in the assumption of stationarity.

Authors who are presenting talks have a * after their name.

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