A characterization of periodicity in the voltage time series of a riometer
A characterization of periodicity in the voltage time series of a riometer
Date
2020-04-20
Authors
Marshall, François
Thomson, David J.
Chave, Alan D.
Fiori, Robyn
Danskin, Donald
Thomson, David J.
Chave, Alan D.
Fiori, Robyn
Danskin, Donald
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Person
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DOI
10.1029/2019JA027160
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Keywords
Periodic elements
Riometer
Multitaper spectral analysis
Cosmic noise
Sidereal day
Solar modes
Riometer
Multitaper spectral analysis
Cosmic noise
Sidereal day
Solar modes
Abstract
This paper reveals unprecedented periodicity in the voltage series of relative ionospheric opacity meters (riometers) of the Canadian Riometer Array (CRA). In quiet times, the riometer voltage series is accurately modeled by a stochastic process whose components include both a six term expansion in harmonic functions and some amplitude modulated modes of lower signal to noise ratio (SNR). In units of cycles per sidereal day (cpsd), the frequencies of the six harmonic functions lie within 0.01 cpsd of an integer. Earth's rotation induces a splitting of the low SNR components, resulting in the appearance of nine multiplets in standardized power spectrum estimates of the considered CRA voltage series. A second feature of these spectrum estimates is a 6 min periodic element appearing in both the CRA voltage series and the proton mass density series of the Advanced Composition Explorer (ACE). Spectral peak frequencies have been detected, which lie near established solar mode frequency estimates. In addition, some of these peak frequency estimates are coincident with peak frequency estimates of the standardized power spectra for the time series of proton mass density and interplanetary magnetic field strength (IMF) at ACE.
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Author Posting. © American Geophysical Union, 2020. This article is posted here by permission of American Geophysical Union for personal use, not for redistribution. The definitive version was published in Journal of Geophysical Research: Space Physics 125(7), (2020): e2019JA027160, doi:10.1029/2019JA027160.
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Marshall, F. A., Thomson, D. J., Chave, A. D., Fiori, R. A. D., & Danskin, D. W. (2020). A characterization of periodicity in the voltage time series of a riometer. Journal of Geophysical Research: Space Physics, 125(7), e2019JA027160.