Plasma turbulence and coherent structures in the polar cap observed by the ICI‐2 sounding rocket

Spicher, Andres; Miloch, W. J.; Clausen, L. B. N.; Moen, J.

doi:10.1002/2015ja021634

Cited by 35 publications

(43 citation statements)

References 81 publications

(202 reference statements)

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“…Kelley et al [] suggested that much of large‐scale structures in the high‐latitude F region are caused by soft particle precipitation. The situation in the dayside cusp region was verified by the ICI‐2 rocket studies [ Moen et al, ; Spicher et al, , ]. However, it may not be the case in the nigthside auroral oval during a substorm.…”

Section: Discussionmentioning

confidence: 89%

Statistical study of the GNSS phase scintillation associated with two types of auroral blobs

et al. 2016

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This study surveys space weather effects on GNSS (Global Navigation Satellite System) signals in the nighttime auroral and polar cap ionosphere using scintillation receivers, all‐sky imagers, and the European Incoherent Scatter Svalbard radar. We differentiate between two types of auroral blobs: blob type 1 (BT 1) which is formed when islands of high‐density F region plasma (polar cap patches) enter the nightside auroral oval, and blob type 2 (BT 2) which are generated locally in the auroral oval by intense particle precipitation. For BT 1 blobs we have studied 41.4 h of data between November 2010 and February 2014. We find that BT 1 blobs have significantly higher scintillation levels than their corresponding polar cap patch; however, there is no clear relationship between the scintillation levels of the preexisting polar cap patch and the resulting BT 1 blob. For BT 2 blobs we find that they are associated with much weaker scintillations than BT 1 blobs, based on 20 h of data. Compared to patches and BT 2 blobs, the significantly higher scintillation level for BT 1 blobs implies that auroral dynamics plays an important role in structuring of BT 1 blobs.

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Section: Discussionmentioning

confidence: 89%

Statistical study of the GNSS phase scintillation associated with two types of auroral blobs

et al. 2016

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“…According to Kintner and Seyler (), the range of scales where turbulence plays a relevant role is from few meters up to ∼1000 km in the topside F region of the high‐latitude ionosphere, a range of spatial scales where large magnetic and electric field fluctuations have been observed. In recent years, an extensive literature has demonstrated that high‐latitude magnetic and electric field fluctuations, as well as plasma density variations, show scale‐invariance and intermittent turbulent features (De Michelis et al, ; ; Golovchanskaya et al, , Spicher et al, ; Tam Sunny et al, ). Furthermore, the scale‐invariance nature of magnetic field fluctuations has been shown to be a function of the different polar regions (polar cap, cusp, auroral oval), the magnetic local time, the interplanetary magnetic field conditions and the geomagnetic activity disturbance level (De Michelis et al, , , ).…”

Section: Introductionmentioning

confidence: 99%

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

et al. 2020

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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.

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“…Various different approaches had been explored to understand nonlinear characteristics and intermittency in ionospheric irregularities, like structure function analysis (Dyrud et al, 2008;Spicher et al, 2015), fractal and multifractal analysis (Wernik et al, 2003;Alimov et al, 2008;Bolzan et al, 2013;Tanna and Pathak, 2014;Miriyala et al, 2015;Chandrasekhar et al, 2016;Fornari et al, 2016;Sivavaraprasad et al, 2018;Neelakshi et al, 2019), and multispectral optical imaging (Chian et al, 2018).…”

Section: Introductionmentioning

confidence: 99%

“…Structure function analysis performed on ionospheric high-latitude in situ data have revealed the intermittent nature of ionospheric irregularities owing to the large deviations from the Kolmogorov's K41 universal power-law index proposed for neutral fluid turbulence (Spicher et al, 2015).…”

Section: Introductionmentioning

confidence: 99%

Structural characterization of the equatorial F region plasma irregularities in the multifractal context

et al. 2020

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Abstract. In the emerging ionosphere–space–weather paradigm, investigating the dynamical properties of ionospheric plasma irregularities using advanced computational nonlinear algorithms provide new insights into their turbulent-seeming nature, for instance, the evidence of energy distribution via a multiplicative cascade. In this study, we present a multifractal analysis of the equatorial F region in situ data obtained from two different experiments performed at Alcântara (2.4∘ S, 44.4∘ W), Brazil, to explore their scaling structures. The first experiment observed several medium- to large-scale plasma bubbles whereas the second experiment observed vertical uplift of the base of the F region. The multifractal detrended fluctuation analysis and the p-model fit are used to analyze the plasma density fluctuation time series. The result shows the presence of multifractality with degree of multifractality 0.53–0.93 and 0.3≤p≤0.4 cascading probability for the first experiment. Other experimental data also exhibit multifractality with degree of multifractality 0.19–0.27 and 0.42≤p≤0.44 cascading probability in ionospheric plasma irregularities. Our results confirm the nonhomogeneous nature of plasma irregularities and characterize the underlying nonhomogeneous multiplicative cascade hypothesis in the ionospheric medium. Differences in terms of scaling and complexity in the data belonging to different types of phenomena are also addressed.

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Plasma turbulence and coherent structures in the polar cap observed by the ICI‐2 sounding rocket

Cited by 35 publications

References 81 publications

Statistical study of the GNSS phase scintillation associated with two types of auroral blobs

Statistical study of the GNSS phase scintillation associated with two types of auroral blobs

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

Structural characterization of the equatorial F region plasma irregularities in the multifractal context

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