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On the Multifractal Features of Low‐Frequency Magnetic Field Fluctuations in the Field‐Aligned Current Ionospheric Polar Regions: Swarm Observations.

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Title: On the Multifractal Features of Low‐Frequency Magnetic Field Fluctuations in the Field‐Aligned Current Ionospheric Polar Regions: Swarm Observations.
Authors: Consolini, G.1 giuseppe.consolini@inaf.it, De Michelis, P.2, Alberti, T.1, Giannattasio, F.2, Coco, I.2, Tozzi, R.2, Chang, T. T. S.3
Source: Journal of Geophysical Research. Space Physics. May2020, Vol. 125 Issue 5, p1-15. 15p.
Subject Terms: *Ionosphere, Magnetic fields, Turbulence
Geographic Terms: Polar regions
Company/Entity: European Space Agency
Abstract: Recent findings on the nature of magnetic field fluctuations in the high‐latitude ionospheric regions have suggested the existence of scaling features, which are the signature of the occurrence of turbulence. These features mainly characterize the magnetic field fluctuations in those regions where the field‐aligned currents flow. Here, we investigate the nature of the Earth's magnetic field fluctuations using the high‐resolution (50 Hz) magnetic measurements from the European Space Agency Earth's observation mission Swarm. Our study indicates that spatiotemporal anomalous scaling features characterize low‐frequency magnetic field fluctuations in the high‐latitude ionospheric regions of field‐aligned currents at spatial scales in the range 0.8–80 km (timescales in the range 0.1–10 s). The signature of a multifractal nature of these fluctuations suggests a highly complex structure of the field‐aligned currents. Our results support the view of inhomogeneous (filamentary) field‐aligned currents, which can have relevant implications in the comprehension of the physical processes responsible for the magnetospheric‐ionospheric coupling and ionospheric heating. Key Points: Low‐frequency magnetic field fluctuations in the topside F region polar ionosphere show scale‐invarianceAnomalous scaling (multifractal/intermittent) features and anisotropy of magnetic field fluctuations are studiedA link between the scale‐invariance of fluctuations and the filamentary nature of field‐aligned currents is discussed [ABSTRACT FROM AUTHOR]
Copyright of Journal of Geophysical Research. Space Physics is the property of Wiley-Blackwell and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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  Data: On the Multifractal Features of Low‐Frequency Magnetic Field Fluctuations in the Field‐Aligned Current Ionospheric Polar Regions: Swarm Observations.
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  Data: <searchLink fieldCode="AR" term="%22Consolini%2C+G%2E%22">Consolini, G.</searchLink><relatesTo>1</relatesTo><i> giuseppe.consolini@inaf.it</i><br /><searchLink fieldCode="AR" term="%22De+Michelis%2C+P%2E%22">De Michelis, P.</searchLink><relatesTo>2</relatesTo><br /><searchLink fieldCode="AR" term="%22Alberti%2C+T%2E%22">Alberti, T.</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Giannattasio%2C+F%2E%22">Giannattasio, F.</searchLink><relatesTo>2</relatesTo><br /><searchLink fieldCode="AR" term="%22Coco%2C+I%2E%22">Coco, I.</searchLink><relatesTo>2</relatesTo><br /><searchLink fieldCode="AR" term="%22Tozzi%2C+R%2E%22">Tozzi, R.</searchLink><relatesTo>2</relatesTo><br /><searchLink fieldCode="AR" term="%22Chang%2C+T%2E+T%2E+S%2E%22">Chang, T. T. S.</searchLink><relatesTo>3</relatesTo>
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  Data: <searchLink fieldCode="JN" term="%22Journal+of+Geophysical+Research%2E+Space+Physics%22">Journal of Geophysical Research. Space Physics</searchLink>. May2020, Vol. 125 Issue 5, p1-15. 15p.
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  Data: *<searchLink fieldCode="DE" term="%22Ionosphere%22">Ionosphere</searchLink><br /><searchLink fieldCode="DE" term="%22Magnetic+fields%22">Magnetic fields</searchLink><br /><searchLink fieldCode="DE" term="%22Turbulence%22">Turbulence</searchLink>
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  Data: Recent findings on the nature of magnetic field fluctuations in the high‐latitude ionospheric regions have suggested the existence of scaling features, which are the signature of the occurrence of turbulence. These features mainly characterize the magnetic field fluctuations in those regions where the field‐aligned currents flow. Here, we investigate the nature of the Earth's magnetic field fluctuations using the high‐resolution (50 Hz) magnetic measurements from the European Space Agency Earth's observation mission Swarm. Our study indicates that spatiotemporal anomalous scaling features characterize low‐frequency magnetic field fluctuations in the high‐latitude ionospheric regions of field‐aligned currents at spatial scales in the range 0.8–80 km (timescales in the range 0.1–10 s). The signature of a multifractal nature of these fluctuations suggests a highly complex structure of the field‐aligned currents. Our results support the view of inhomogeneous (filamentary) field‐aligned currents, which can have relevant implications in the comprehension of the physical processes responsible for the magnetospheric‐ionospheric coupling and ionospheric heating. Key Points: Low‐frequency magnetic field fluctuations in the topside F region polar ionosphere show scale‐invarianceAnomalous scaling (multifractal/intermittent) features and anisotropy of magnetic field fluctuations are studiedA link between the scale‐invariance of fluctuations and the filamentary nature of field‐aligned currents is discussed [ABSTRACT FROM AUTHOR]
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  Data: <i>Copyright of Journal of Geophysical Research. Space Physics is the property of Wiley-Blackwell and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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              Text: May2020
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