TEC variations during geomagnetic storm/substorm with Pc5/PI2 pulsation signature

Hamada, Amr; Mahrous, A.; Fathy, Ibrahim; Ghamry, Essam; Groves, K. M.; Yumoto, K.

doi:10.1016/j.asr.2015.02.010

Cited by 8 publications

(5 citation statements)

References 58 publications

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“…Pi2 pulsations at low latitude are good indicators to substorm onset because they are not only observed in the nightside but also in the dayside (Yanagihara and Shimizu, 1966). Pi2 pulsation is considered as a result of hydromagnetic disturbances driven by sudden change in magnetospheric convection or reconfiguration in the magnetotail during the substorm expansive phase, so it is considered a better proxy of substorm onset than its counterpart at middle and high latitude (Yumoto 1986;Ghamry et al, 2011Ghamry et al, , 2012Hamada et al, 2015;Ghamry and Fathy 2016). Plasmaspheric cavity resonance (PCR), plasmaspheric virtual resonance (PVR), and plasmapause surface mode are considered major source mechanisms of Pi2 pulsations (Allan et al, 1986;Zhu and Kivelson, 1989;Lee, 1996;Lee and Kim, 1999;Lee and Lysak, 1999;Takahashi et al, 2003;Lee and Takahashi, 2006;Kwon et al, 2013;Ghamry et al, 2015;Ghamry, 2015).…”

Section: Introductionmentioning

confidence: 99%

A comprehensive analysis of the geomagnetic storms occurred during 18 February and 2 March 2014

Ghamry

Lethy

Arafa-Hamed

et al. 2016

NRIAG Journal of Astronomy and Geophysics

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Section: Introductionmentioning

confidence: 99%

A comprehensive analysis of the geomagnetic storms occurred during 18 February and 2 March 2014

Ghamry

Lethy

Arafa-Hamed

et al. 2016

NRIAG Journal of Astronomy and Geophysics

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“…Pc5 ULF waves with periods of 150-600 s have the largest amplitudes among all geomagnetic pulsations and cause variations in the ionospheric electric eld and plasma ow (e.g., Lester et al, 2000;Norouzi-Sedeh et al, 2015;Sakaguchi et al, 2012), eld-aligned currents (Fenrich et al, 2019), electron density and conductance in the E-region of the ionosphere (Lathuillere et al, 1986;Piout et al, 2003), and TEC (Davies and Hartman, 1976;Hamada et al, 2015;Kozyreva et al, 2020;Okuzawa andDavies, 1981 Pilipenko et al, 2014;Watson et al, 2015). Compared to ground magnetometer data, Ponomarenko et al (2003) successfully visualized ULF waves using SuperDARN TIGER radar data.…”

Section: Introductionmentioning

confidence: 99%

Periodic oscillations in the high-latitude ionosphere driven by ultralow frequency waves: simultaneous measurements using SuperDARN radars and GNSS-TEC technique

Shinbori,

Hosokawa,

Hori

et al. 2024

Preprint

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Analyzing the propagation characteristics of ultralow frequency (ULF: ~1–100 mHz) magnetohydrodynamic waves through ground- and satellite-based magnetometer data offers insights into the plasma conditions within the magnetosphere, plasmasphere, and ionosphere. Although a network of ground magnetometers provides estimations of ULF waves' macroscopic properties, their ability to capture small-scale structures (< 100 km) is limited. This limitation arises from the spatial integration of ionospheric current effects, which effectively "smears out" these delicate features. Therefore, to elucidate the generation mechanism of ionospheric electron-density variations associated with Pc5 ultralow-frequency (ULF) waves, from subauroral to high latitudes, we analyzed the global navigation satellite system (GNSS)-total electron content (TEC), ionospheric plasma flow observed by the Super Dual Auroral Radar Network (SuperDARN), and electron density in the inner magnetosphere measured by the Arase satellite. On 23 November, 2022, the SuperDARN Prince George (PGR) radar in the dusk sector detected meridional plasma flow oscillations with periods and amplitudes of 5 min and 10–60 m/s, respectively. The plasma flow oscillations started at approximately 01:10 UT and persisted until 03:30 UT over a magnetic latitude range of 65–72°, with an increasing amplitude as the magnetic latitude increased. The electron density did not exhibit a sharp gradient during the inner magnetosphere pass, indicating that the plasmasphere extended beyond the apogee of the Arase satellite (6.1 Re) under quiet geomagnetic conditions. A detailed comparison between SuperDARN radar and GNSS-TEC data showed that meridional plasma flow oscillations appeared in the mid-latitude trough and auroral oval (increased TEC region). Additionally, the equatorward boundary of the auroral oval was located at a between magnetic latitudes of 72 and 74 °. The 15-min detrended TEC measured over the Fort Simpson radar, inside the field-of-view of the PGR radar, showed oscillations similar to the ionospheric plasma flow variations. Through a spectral analysis of the detrended TEC and meridional plasma flow oscillations, we identified a phase difference of ~ 135° (~ 1.9 min) between them. This result is consistent with a simple model calculation using an oscillating electric field with a period of 5 min and an amplitude of 30 m/s for the vertical \(\mathbf{E}\times \mathbf{B}\) drift. Based on these observational and model calculation results, the TEC oscillations can be explained by the upward and downward motion of the ionosphere owing to an external electric field caused by Alfvén waves propagating along the magnetic field lines from the dusk-side magnetosphere.

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“…Modern ground-based sounding techniques, such as HF Doppler sounders, SuperDARN radars, trans ionospheric radio wave propagation, and riometers, can detect local variations in ionospheric electron density caused by long-period ULF waves (Fenrich et al, 1995;Ziesolleck et al, 1998;Ponomarenko et al, 2001;Pilipenko et al 2014a;Watson et al,2015;Vorontsova et al, 2016;Fenrich et al, 2019;Kozyreva et al, 2020). The GPS-TEC technique can also detect certain types of ULF waves in the ionosphere including the Pc5 waves at high latitudes and Pc3-4/Pi2 waves at mid latitudes (Davies & Hartman, 1976;Hamada et al, 2015). The mechanism of TEC modulation by ULF waves is still unknown and challenging for the MHD wave theory.…”

Section: Introductionmentioning

confidence: 99%

Monochromatic Pc5 Modulations of the Ionospheric Velocities and TEC and GOES-16 Magnetic Field Associated with Repeated Solar Wind Dynamic Pressure Enhancement

Singh

Lee

Kim

2023

Preprint

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This study presents ultra-low frequency (ULF) Pc5 discrete spectrum simultaneously observed in the magnetosphere and high- to low-latitude ionospheres near noon hours (~10-14 MLT) during the recovery phase of geomagnetic storm on November 4, 2021. During the recovery phase, magnetospheric toroidal mode oscillations (GOES-16 Bn) appeared according to solar wind dynamic pressure enhancements after GOES Bp and Be (poloidal mode) oscillations precede during high solar wind speeds. When Bn oscillates, the ionospheric line-of-sight (LOS) velocity and echo power oscillate at the same discrete frequencies of 1.7 and 2.2 mHz (9.7 and 7.5 min), observed by Super Dual Auroral Radar Network (SuperDARN) at Saskatoon (eastward LOS). The period of negative LOS velocity (away from the radar) for 7.5 min or 9.7 min corresponds to echo power increase. This signifies that both the ionospheric density and poleward convection velocity increase are driven by the periodic forcing of the convection electric field and energetic electron precipitation. The same frequency pulsations have also been observed in the geomagnetic field (H-component) and Global Positioning System (GPS) total electron content (TEC) from high- to low-latitude ionosphere. The oscillation frequency of the H-component is consistently preserved at 1.7 mHz (9.7 min) down to low latitudes. The Pc5 oscillations at high to low latitudes can be attributed to toroidal mode Alfven waves and the compressional mode propagating across magnetic field lines as well as the fast magnetosonic waveguide mode at work by the solar wind dynamic pressure enhancements at high solar wind speeds.

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TEC variations during geomagnetic storm/substorm with Pc5/PI2 pulsation signature

Cited by 8 publications

References 58 publications

A comprehensive analysis of the geomagnetic storms occurred during 18 February and 2 March 2014

A comprehensive analysis of the geomagnetic storms occurred during 18 February and 2 March 2014

Periodic oscillations in the high-latitude ionosphere driven by ultralow frequency waves: simultaneous measurements using SuperDARN radars and GNSS-TEC technique

Monochromatic Pc5 Modulations of the Ionospheric Velocities and TEC and GOES-16 Magnetic Field Associated with Repeated Solar Wind Dynamic Pressure Enhancement

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