Evaluating Solar Quiet Variation of the Horizontal Geomagnetic Field using Nonlinear Time Series Analysis Techniques

— In this present paper, the nonlinear time series techniques were used to analyse solar quiet variation in the horizontal component of the geomagnetic field (SqH) data collected from the INTERMAGNET during the year 2012. The complexity of the nonlinear dynamics based on estimated time delay (τ) and...

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Bibliographic Details
Published in:Geomagnetism and Aeronomy 2020-09, Vol.60 (5), p.661-671
Main Authors: Falayi, E. O., Ajose, A. S., Roy-Layinde, T. O., Adewole, A. T., Adepitan, J. O.
Format: Article
Language:English
Subjects:
Chaos theory
Counter electrojet
Earth and Environmental Science
Earth Sciences
Electrojets
Equatorial electrojet
Geomagnetic field
Geomagnetism
Geophysics/Geodesy
Ionosphere
Latitude
Liapunov exponents
Nonlinear analysis
Nonlinear dynamics
Time lag
Time series
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Summary:— In this present paper, the nonlinear time series techniques were used to analyse solar quiet variation in the horizontal component of the geomagnetic field (SqH) data collected from the INTERMAGNET during the year 2012. The complexity of the nonlinear dynamics based on estimated time delay (τ) and embedding dimension (m) are expressed by Lyapunov exponents (LE). The positive values of the Lyapunov exponent for the Addis Abba (AAE), Eskdalemuir (ESK), Hartebeesthoek (HBK), Hermanus (HER), Mbour (MBO), Sodankyla (SOD) and Tamanrasset (TAM) time series are 0.0027, 0.0118, 0.0082, 0.0042, 0.0027, 0.016 and 0.0036 respectively for the year 2012. We observed positive values of Lyapunov exponent which are more significant at high latitudes (ESK and SOD) and mid latitudes (TAM, HBK and HER) which are located outside the electrojet region. The low latitudes (AAE and MBO) have low values of Lyapunov exponent which are located within electrojet region. The internal dynamics and inherent irregularities of ionosphere may be responsible for the occurrence of chaos during the Sq (H) variation, which show evidence of nonlinear properties. The external factors such as counter electrojet (CEJ) and equatorial electrojet (EEJ) might be responsible for inherent dynamics.This may possibly be the reason for the higher and lower values of Lyapunov exponents during SqH.
ISSN:0016-7932
1555-645X
0016-7940
DOI:10.1134/S0016793220050060