The effect of ionospheric inhomogeneity on magnetic pulsation polarization: Magnetic disturbance on the ground as a function of inhomogeneity magnitude

Belova, Evgenia; Pchelkina, E.; Lyatsky, W.; Pashin, A. B.

doi:10.1016/s1364-6826(97)00022-9

Cited by 5 publications

(5 citation statements)

References 5 publications

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“…To summarize, the complexity in polarization pattern might be due to (1) the horizontal inhomogeneity of the ionospheric conductivity [ Hayashi et al , 1981; Belova et al , 1997] or the ground conductivity [ Fraser , 1975b]; (2) waves with multiple frequency components from different injection regions; (3) superposition effects through refraction, reflection, and transmission in the waveguide [ Altman and Fijalkow , 1980]; (4) at high latitudes, the array is located close to the wave injection region where the superposed effect of incident waves and ducted waves is more dominant [ Hayashi et al , 1981; Kim et al , 2010]; and (5) polarization change of EMIC waves during propagation in the magnetosphere [ Young et al , 1981; Horne and Thorne , 1993; Meredith et al , 2003; Hu and Denton , 2009].…”

Section: Discussionmentioning

confidence: 99%

“… Hayashi et al [1981] and Kim et al [2010] reported greater variation of the polarization pattern at high latitudes, suggesting it might be attributed to the array being located close to the wave injection region where the combination of incident waves and ducted waves is more dominant. A theoretical approach by Belova et al [1997] showed how the polarization pattern on the ground can change in a complex fashion as the inhomogeneity of ionospheric conductivity varies. There have been studies of Pc1–2 waves indicating various source regions near the magnetospheric layer, the plasmapause, plasma mantle, and/or the cusp [e.g., Menk et al , 1992; Popecki et al , 1993; Neudegg et al , 1995; Dyrud et al , 1997; Engebretson et al , 2005] and the latitudinal extent of 0.5° to 1° in ILAT [e.g., Mursula et al , 1994a; Erlandson et al , 1996; Yahnin and Yahnina , 2007; Engebretson et al , 2008].…”

Section: Introductionmentioning

confidence: 99%

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Statistical study of Pc1-2 wave propagation characteristics in the high-latitude ionospheric waveguide

et al. 2011

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[1] Propagation of ULF Pc1-2 geomagnetic pulsations in the ionospheric waveguide (duct), centered around the F 2 region altitude of maximum ionospheric electron density, is studied using the data obtained from a ground array of five search coil magnetometers in Antarctica distributed over a very extensive range of geomagnetic latitudes from subauroral to polar cap (−62°to −87°, spanning 2920 km geographically). A statistical study including a total of 138 Pc1-2 wave ducting events in 2007 presents wave power attenuation factors that vary between ∼10 and 14 dB/1000 km and the change of polarization during the wave propagation under different ionospheric sunlight conditions. It is also shown that the frequency cutoff of the wave events in the waveguide is dependent on the ionospheric conductivity, and the wave power attenuation increases with increasing frequency. In addition, it appears that initial propagation direction is related to attenuation, which supports the idea that meridional propagation is most efficient as predicted in previous studies. The results show the observations of ducted waves over such an unprecedented latitudinal extent along a magnetic meridian, which have rarely been measured before, and thus provide very important information in regard to wave ducting under various ionospheric conditions.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Statistical study of Pc1-2 wave propagation characteristics in the high-latitude ionospheric waveguide

et al. 2011

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“…We also found that wave properties show different characteristics for different latitudes and MLTs. These complex wave properties can be attributed to either (1) inhomogeneous ionospheric conductivity (Belova et al, 1997;Kim et al, 2010) or (2) interference between the incident and ducted waves (Hayashi et al, 1981). According to theoretical studies (Denton, 2018;Hu et al, 2010;Hu & Denton, 2009;Johnson & Cheng, 1999;Kim & Johnson, 2016;Omidi et al, 2013), the wave properties can change while propagating from the source region to the ionosphere.…”

Section: Wave Properties Dependent On Mlt and Latitudementioning

confidence: 99%

Large‐Scale Ducting of Pc1 Pulsations Observed by Swarm Satellites and Multiple Ground Networks

Kim

Hwang

Park

et al. 2018

Geophysical Research Letters

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Low Earth orbit satellites frequently encounter Pc1 pulsations, but most have been observed with limited latitudinal extent or short lifetime. In this study we analyze two large‐scale Pc1 pulsations (both latitudinally wide and long‐lasting) generated by ionospheric ducting effect using Swarm and ground magnetometers on 25 June and 3 September 2015. Swarm observed the 25 June pulsations on both dayside and nightside during the storm time substorm (a strong geomagnetic storm on 23 June with Dst = − 204 nT). We found the Pc1 pulsations were pervasive in both magnetic local time sectors of dayside and nightside for at least 2 hr. Another large Pc1 pulsation on 3 September was observed during a nonstorm substorm period. We conclude that (1) ionospheric ducting can transmit Pc1 waves to a wide range of L shells, (2) geomagnetic storm is not a prerequisite for such large‐scale ducting, and (3) wave intensity can abruptly decrease across sharp gradients in the ionospheric plasma density.

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“…Superposition effects through refraction, reflection, and transmission in the waveguide can also be considered. A model study by Belova et al [1997] showed how the polarization pattern on the ground can change in a complicated fashion as the inhomogeneity of the ionospheric conductivity varies. Hayashi et al [1981] reported greater variation of polarization properties at high latitudes and suggested that the lack of uniformity in the polarization pattern appeared to be related to the fact that the array is located close to the wave injection region where the combination of incident waves and ducted waves is more dominant.…”

Section: Observations and Interpretationsmentioning

confidence: 99%

Ducting characteristics of Pc 1 waves at high latitudes on the ground and in space

et al. 2010

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[1] Well-defined ULF Pc 1 geomagnetic pulsations have been observed simultaneously from a ground array of five search-coil magnetometers in the morning sector of Antarctica on Mar. 23, 2007. Distributed over a very extensive range of geomagnetic latitudes (−62°to −87°, spanning ∼2920 km geographically) approximately along a magnetic meridian, the array showed poleward propagation of the Pc 1 waves in the ionospheric waveguide. It is observed that attenuation factors are between ∼8 and 20 dB/1000 km and the polarization sense changes from left-hand to right-hand as the waves are ducted poleward. However, a complex polarization pattern (i.e., change in ellipticity and major axis angle) was seen on the ground, which might be attributed to the array being close to the wave injection region where the superposed effect of incident waves and ducted waves is dominant. A CHAMP satellite conjunction showed a transverse and nearly linearly polarized Pc 1 ULF wave at the altitude of the ducting layer (∼350 km) over a limited latitudinal extent (−53°to −61°ILAT). The polarization analysis performed using the ground data supports the idea that CHAMP detected the wave activity near the wave injection region. The observations are unique in that the ducted waves, seen over an array with unprecedented geomagnetic latitudinal range and positioning along a magnetic meridian (a condition that provides the most efficient ducting), have rarely been measured before.

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The effect of ionospheric inhomogeneity on magnetic pulsation polarization: Magnetic disturbance on the ground as a function of inhomogeneity magnitude

Cited by 5 publications

References 5 publications

Statistical study of Pc1-2 wave propagation characteristics in the high-latitude ionospheric waveguide

Statistical study of Pc1-2 wave propagation characteristics in the high-latitude ionospheric waveguide

Large‐Scale Ducting of Pc1 Pulsations Observed by Swarm Satellites and Multiple Ground Networks

Ducting characteristics of Pc 1 waves at high latitudes on the ground and in space

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