Study of nonlinear time series and wavelet power spectrum analysis using solar wind parameters and geomagnetic indices

Falayi, E.O.; Adewole, A. T.; Adelaja, A.D.; Ogundile, Olayinka O.; Roy-Layinde, T. O.

doi:10.1080/20909977.2020.1728866

Cited by 7 publications

(3 citation statements)

References 49 publications

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“…Chaos was investigated and established in magnetosphere by using the 0–1 test on AL and Bz indices (Devi et al., 2013). The chaotic properties of both solar wind parameters and geomagnetic indices were investigated between the period 2008 and 2017 (Falayi et al., 2020). (Sharma, 1997) also showed that magnetospheric dynamics are low dimensional dynamical systems.…”

Section: Introductionmentioning

confidence: 99%

Evolution of Dynamical Complexities in Geospace as Captured by Dst Over Four Solar Cycles 1964–2008.

et al. 2021

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Geospace refers to the region of the outer space near Earth; this includes the upper atmosphere, ionosphere as well as the magnetosphere. Geospace basically span through region of space which goes from the solar photosphere to the mesosphere of the Earth. The studies of the dynamics of geospace has continued to attract attention due to its significant impact on the present day space-dependent technological operations. Today, health and functionality of thousands of satellites domiciled in space environment, has made the understanding of space weather which is defined as the conditions in the outer space a global concern. The Earth's magnetosphere which is the intermediary region between the Earth's ionosphere and the outer space has been described by Donner et al. (2019) as a complex system composed of several nonlinearly coupled subsystems, within which multiple interconnected processes act on a wide range of spatial and tem-

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Section: Introductionmentioning

confidence: 99%

Evolution of Dynamical Complexities in Geospace as Captured by Dst Over Four Solar Cycles 1964–2008.

et al. 2021

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“…Chaos theory has provided an innovative method for studying non-linear hydrological phenomenon, which are complex and changeable (Falayi et al 2020;Mangiarotti et al 2019;Fu et al 2017). Much progress has been achieved in identifying the signs of chaos, and innovative methods have been suggested.…”

Section: Introductionmentioning

confidence: 99%

Phase space mapping of pivotal climatic and non-climatic elements affecting basin’ drought

Rahmani

Fattahi

2021

Arab J Geosci

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This study puts forward a novel approach to identify Parishan Lake drying up roots by studying the dynamic evolutions in the study sub-basin. SPI, extreme climate indices, and several parameters (precipitation, evaporation, and temperature) were employed for 16 years (2002)(2003)(2004)(2005)(2006)(2007)(2008)(2009)(2010)(2011)(2012)(2013)(2014)(2015)(2016)(2017)(2018). To obtain the object of the study, the phase space reconstruction method of delays and chaos theory were applied. Reconstruction of the phase space exposed that some attractors were elliptical shape and some were point. The temperature, evaporation, TXn, and PET suggested periodic time-series. However, TX90p, TX10p, TN10p, and SPI revealed aperiodic time-series, and, RX1day, Rx5day, and precipitation exhibited quasi-periodic behavior in time-series. The trajectory dispersion of all the parameters except TN10p, TX90p, and SPI reflected low chaos, while TN10p, TX90p, and SPI presented random behavior. The phase space behavior of RX1day, Rx5day, TN10p, precipitation, TX90p, and TX10p was nonsinusoidal. By contrast, temperature, evaporation, TXn, PET, and SPI displayed sinusoidal phase space behavior. The findings confirmed that Parishan Lake sub-basin has experienced climate changes which have generated anomalies in climatic and nonclimatic parameters. The comparison between reconstructed phase space of study sub-basin and control sub-basin verified that climate change yielded equal impacts on the study and control sub-basins. As it was highly improbable that the Parishan Lake could be dried up in less than 10 years due to climate change, other affecting factors were also addressed. The findings indicated that excessive groundwater exploitation (as the key factor) increased dryness in the Parishan Lake sub-basin.

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“…Santos, et al (2001) suggested that the accumulated power of GWS occurs, particularly, between high frequencies. However, Falayi et al, (2020) obtained the concentration of power between larger period bands across solar wind parameters and geomagnetic indices. This study suggests that the oscillation and the concentration of power of relativistic electrons showed significant peaks across the low-frequency periods (e.g.…”

Section: Introductionmentioning

confidence: 99%

Response_Reviewer_1

Adhikari¹

2020

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We thank the referee for reviewing our manuscript and for providing detailed comments. The reviewer raised several major concerns regarding the techniques employed in our study, which we address in detail below. As can be seen from our response, we feel that these issues can be resolved by better clarifying our methodology in the revised version of our manuscript. Our responses are marked in red color font in the text below, in between the reviewer's comments. General comments: The authors conducted case studies to analyze the variations of >2 MeV electrons in terrestrial radiation belt, and their relation to interplanetary triggers C1 ANGEOD Interactive comment Printer-friendly version Discussion paperand geomagnetic activities. However, neither any contribution can be found to further the current understanding of relativistic electron dynamics, nor the methods the authors applied are appropriate and valid. Specific comments: 1. While the authors claimed that they extended the understanding of radiation belt dynamics, what has been shown in this manuscript is that they simply listed the previous findings of other researchers, without, throughout the manuscript, pointing out which aspects are still not clear and what they did to improve the understanding of these aspects. I think this is the main problem. This main flaw makes the current manuscript more an essay, rather than a research article.Response: The scope of the paper will be included in the revised manuscript:The population of relativistic electron fluxes in the Earth's radiation belt are highly variable which are supposed to be balanced by a complicated and delicate balance between acceleration, transport, and loss processes. It is one of the subjects in space science of intense interest and study. There have been vigorous studies and research about those killer electrons (named since its adverse effects to astronauts and satellites onboard), still, there is a lack of understanding about their relation and periodicities with so-called geomagnetic storms. This casework thus tried to comprehend its periodic nature and dependency with geomagnetic storms using cross correlation and wavelet analysis. This paper addresses the trend and association of relativistic electron fluxes with geomagnetic storms taking important solar interplanetary parameters. The discussion and conclusion of this casework is believed to serve as a reference for the times to come in the field of space science.In the revised manuscript, we will revise the introduction section and add two new events as below.

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Study of nonlinear time series and wavelet power spectrum analysis using solar wind parameters and geomagnetic indices

Cited by 7 publications

References 49 publications

Evolution of Dynamical Complexities in Geospace as Captured by Dst Over Four Solar Cycles 1964–2008.

Evolution of Dynamical Complexities in Geospace as Captured by Dst Over Four Solar Cycles 1964–2008.

Phase space mapping of pivotal climatic and non-climatic elements affecting basin’ drought

Response_Reviewer_1

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