Conjugate Ionosphere‐Magnetosphere Observations of a Sub‐Alfvénic Compressional Intermediate‐<i>m</i> Wave: A Case Study Using EKB Radar and Van Allen Probes

Mager, Olga V.; Челпанов, Максим; Mager, P. N.; Klimushkin, D. Yu.; Berngardt, O. I.

doi:10.1029/2019ja026541

Cited by 20 publications

(18 citation statements)

References 64 publications

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“…Meanwhile, these pulsations are usually classified as medium-scale in the papers devoted to wave properties in the magnetosphere (see, e.g. Mager et al (2019)).…”

Section: Discussionmentioning

confidence: 99%

Spatial scale of geomagnetic Pc5/Pi3 pulsations as a factor of their efficiency in generation of geomagnetically induced currents

Yagova

Pilipenko²,

Sakharov³

et al. 2020

Preprint

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Geomagnetically induced currents (GICs) in a meridional power transmission line on the Kola Peninsula are analyzed during the intervals of Pc5/Pi3 (frequency range from 1.5 to 5 mHz) pulsations recorded at the IMAGE magnetometer network. We have analyzed GIC in a transformer at the terminal station Vykhodnoj (68 N, 33 E) during the entire year of 2015, near the maximum of 24-th Solar cycle. To quantify the efficiency of GIC generation by geomagnetic pulsations, a ratio between power spectral densities of GIC and magnetic field variations is introduced. Upon examination of the geomagnetic pulsation efficiency in GIC generation, the emphasis is given to its dependence on frequency and spatial scale. To estimate pulsation spatial scales in latitudinal and longitudinal directions, the triangle of stations KEV-SOD-KIL has been used. Large-scale pulsations (with a high spectral coherence, low phase difference, and similar amplitudes at latitudinally separated stations) are found to be more effective in GIC generation than small-scale pulsations. The GIC response also depends on the pulsation scale across the electric power line.

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“…Meanwhile, these pulsations are usually classified as medium-scale in the papers devoted to wave properties in the magnetosphere (see, e.g. Mager et al (2019)).…”

Section: Discussionmentioning

confidence: 99%

Spatial scale of geomagnetic Pc5/Pi3 pulsations as a factor of their efficiency in generation of geomagnetically induced currents

Yagova

Pilipenko²,

Sakharov³

et al. 2020

Preprint

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“…Some of the observed magnetospheric ULF waves are coined as the compressional waves characterized by the variation of the parallel component of the wave magnetic field [16][17][18]. In the magnetohydrodynamics framework, these waves can be identified with fast or slow MHD modes [19].…”

Section: Drift-compressional Modesmentioning

confidence: 99%

Integral Equations for Problems on Wave Propagation in Near-Earth Plasma

2021

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We consider the solutions of two integrodifferential equations in this work. These equations describe the ultra-low frequency waves in the dipol-like model of the magnetosphere in the gyrokinetic framework. The first one is reduced to the homogeneous, second kind Fredholm equation. This equation describes the structure of the parallel component of the magnetic field of drift-compression waves along the Earth’s magnetic field. The second equation is reduced to the inhomogeneous, second kind Fredholm equation. This equation describes the field-aligned structure of the parallel electric field potential of Alfvén waves. Both integral equations are solved numerically.

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“…We use for the analysis the 4-day minimum Dst and 6-hour maximal AE, as Pc5 amplitudes are maximal at recovery phase of geomagnetic storms (Posch et al, 2003), and auroral substorms are followed by Pi3 pulsations (Kleimenova et al, 2002) and Pc5 waves with high azimuthal and intermediate wavenumbers (Zolotukhina et al, 2008;Mager et al, 2019). The results for Dst and AE indexes are summarized in Figure 12.…”

Section: Statisticsmentioning

confidence: 99%

Geomagnetic pulsations in the Pc5/Pi3 frequency range and fluctuations of foF2 frequency

Yagova

Kozlovsky²,

Fedorov

et al. 2019

Preprint

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Abstract. Using data of the ionosonde in Sodankyla, (SOD, 67° N, 27° E, Finland), parameters of variations of foF2 critical frequency in the Pc5/Pi3 (1–5 mHz) frequency range are studied. For that, a technique of automatic detection of critical frequency from an ionogram is developed. The variations of foF2 are compared with the Pc5/Pi3 geomagnetic pulsations on the ground and in the magnetosphere. The variations of foF2 are in the majority of cases decoupled from the Pc5/Pi3 on the ground. Meanwhile, the analysis of geomagnetic and foF2 variations at SOD show intervals with noticeable coherence for both horizontal components. These coherent pulsations are predominantly registered in the afternoon MLT sector. Statistically, their spectral content, polarization and spatial distribution differs from those of background variations. Coherent pulsation tend to occur under moderate geomagnetic and auroral activity, SW speed, and dynamic pressure fluctuations. The fraction of coherent geomagnetic and foF2 pulsations is higher for the geomagnetic pulsations registered in the magnetosphere, than on the ground.

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Conjugate Ionosphere‐Magnetosphere Observations of a Sub‐Alfvénic Compressional Intermediate‐m Wave: A Case Study Using EKB Radar and Van Allen Probes

Cited by 20 publications

References 64 publications

Spatial scale of geomagnetic Pc5/Pi3 pulsations as a factor of their efficiency in generation of geomagnetically induced currents

Spatial scale of geomagnetic Pc5/Pi3 pulsations as a factor of their efficiency in generation of geomagnetically induced currents

Integral Equations for Problems on Wave Propagation in Near-Earth Plasma

Geomagnetic pulsations in the Pc5/Pi3 frequency range and fluctuations of foF2 frequency

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