Journal articles
A correlation study regarding the AE index and ACE solar wind data for Alfvénic intervals using wavelet decomposition and reconstruction
Abstract : The purpose of this study is to present a wavelet interactive filtering and reconstruction technique and apply this to the solar wind magnetic field components detected at the L1 Lagrange point ∼ 0.01 AU upstream of the Earth. These filtered interplanetary magnetic field (IMF) data are fed into a model to calculate a time series which we call AE *. This model was adjusted assuming that magnetic reconnec-tion associated with southward-directed IMF B z is the main mechanism transferring energy into the magnetosphere. The calculated AE * was compared to the observed AE (auroral electrojet) index using cross-correlation analysis. The results show correlations as high as 0.90. Empirical removal of the high-frequency, short-wavelength Alfvénic component in the IMF by wavelet decomposition is shown to dramatically improve the correlation between AE * and the observed AE index. It is envisioned that this AE * can be used as the main input for a model to forecast relativistic electrons in the Earth's outer radiation belts, which are delayed by ∼ 1 to 2 days from intense AE events.
Cited literature [39 references]
https://hal-insu.archives-ouvertes.fr/insu-01976508
Contributor : Nathalie Pothier <>
Submitted on : Thursday, January 10, 2019 - 10:12:04 AM
Last modification on : Wednesday, September 23, 2020 - 4:38:29 AM
Long-term archiving on: : Thursday, April 11, 2019 - 2:48:20 PM
Contributor : Nathalie Pothier <>
Submitted on : Thursday, January 10, 2019 - 10:12:04 AM
Last modification on : Wednesday, September 23, 2020 - 4:38:29 AM
Long-term archiving on: : Thursday, April 11, 2019 - 2:48:20 PM
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npg-25-67-2018.pdf
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