Local Time Differences in the Ionospheric Electromagnetic Ion Cyclotron Waves during Storm Time

Sun, Limin; Wang, Hui; He, Yangfan

doi:10.3724/sp.j.0254-6124.2021.0205

Cited by 2 publications

(2 citation statements)

References 15 publications

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“…The SYISR Ne data are available at https://doi. org/10.17605/OSF.IO/4H5J8 (Sun, 2023). GOLD data presented in this research can be accessed at the GOLD Science Data Center (http://gold.cs.ucf.edu/search/).…”

Section: Acknowledgmentsmentioning

confidence: 99%

A Case Study of Ionospheric Storm‐Time Altitudinal Differences at Low Latitudes During the May 2021 Geomagnetic Storm

Kuai,

Sun,

Liu

et al. 2024

JGR Space Physics

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Previous studies paid little attention to the ionospheric storm‐time altitudinal differences due to insufficiency of ionospheric measurements. In this work, multiple instrumental observations were used to investigate the ionospheric storm‐time response at low latitudes in the American and Asian‐Australian sectors during the May 2021 geomagnetic storm. The ground‐based Global Navigation Satellite Systems (GNSS) total electron content (TEC) and Low Earth Orbit (LEO) satellite topside TEC presented opposite (positive/negative) variations in the low‐latitude and equatorial region of both sectors during this storm. The electron density profiles from the Constellation Observing System for Meteorology, Ionosphere, and Climate‐2 (COSMIC‐2) and the Sanya Incoherent Scatter Radar showed a good agreement and well explained the opposite variations between GNSS TEC and LEO satellite topside TEC. The F2‐layer peak height (hmF2) and peak density (NmF2) displayed inverse variations, and the feature was present mostly in the regions between equatorial ionization anomaly crests. The combined modulation effects of the storm‐time zonal electric fields and the field‐aligned transports possibly resulted in the contrary variations of hmF2 and NmF2 in the low‐latitude and equatorial region, leading to the storm‐time altitudinal differences during this storm. Relatively, the storm‐time thermospheric composition disturbances might be a minor factor responsible for these differences.

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Section: Acknowledgmentsmentioning

confidence: 99%

A Case Study of Ionospheric Storm‐Time Altitudinal Differences at Low Latitudes During the May 2021 Geomagnetic Storm

Kuai,

Sun,

Liu

et al. 2024

JGR Space Physics

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“…Sun et al. (2021) also found that EMIC wave frequency is higher in the dawn to pre‐noon sector than that of the dusk to pre‐midnight sector and proposed that locations of the source region and concentrations of heavy ions may be different according to local time. Previous studies have speculated about possible causes of EMIC wave frequency variations at different MLT regions.…”

Section: Introductionmentioning

confidence: 99%

Revealing the EMIC Wave Frequency Differences in the Ionosphere via Coordinated Observations: A Case Study

Ouyang,

Yue,

Wang

et al. 2024

JGR Space Physics

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We study electromagnetic ion cyclotron (EMIC) waves based on observations from the ionosphere, magnetosphere, and ground during a geomagnetic storm recovery phase on 28 August 2018. In this case, multiple ducting EMIC waves in the ionosphere show higher frequencies in the post‐midnight than those in the pre‐midnight. Ionospheric EMIC wave frequency differences in magnetic local time (MLT) are consistent with MLT frequency differences in the equatorial magnetosphere, which are mainly caused by different background magnetic field at different L‐shells. Moreover, we report the first observation of frequency range selections in ionospheric ducting EMIC waves and find that frequency selections depend on the magnetic field intensity in the main part of the ionospheric waveguide, with higher frequency corresponding to larger magnetic field. This study reveals the important role of background magnetic field in regulating ducting EMIC wave frequencies in the ionosphere.

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Local Time Differences in the Ionospheric Electromagnetic Ion Cyclotron Waves during Storm Time

Cited by 2 publications

References 15 publications

A Case Study of Ionospheric Storm‐Time Altitudinal Differences at Low Latitudes During the May 2021 Geomagnetic Storm

A Case Study of Ionospheric Storm‐Time Altitudinal Differences at Low Latitudes During the May 2021 Geomagnetic Storm

Revealing the EMIC Wave Frequency Differences in the Ionosphere via Coordinated Observations: A Case Study

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