Storm Time EMIC Waves Observed by Swarm and Van Allen Probe Satellites

Wang, Hui; He, Yangfan; Lühr, Hermann; Kistler, L. M.; Saikin, A.; Lund, E. J.; Ma, Shijing

doi:10.1029/2018ja026299

Cited by 18 publications

(31 citation statements)

References 71 publications

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“…Our statistical results are consistent with those from the case study by Wang et al (2019). Wang et al (2019) investigated the storm time EMIC waves during June 21-29, 2015, and found that the waves in the premidnight sector occurred earlier than those around prenoon during the recovery period in response to the substorm.…”

Section: Storm Phase Dependent Emic Wave Occurrences In Different Local Time Sectorssupporting

confidence: 90%

Local time and longitudinal differences in the occurrence frequency of ionospheric EMIC waves during magnetic storm periods

Wang¹,

He²,

Luehr³

2021

Preprint

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<div><span>The spatial and temporal distributions of ionospheric electromagnetic ion cyclotron (EMIC) waves during magnetic storms from 2014 to 2018 were studied using Swarm observations. Ionospheric EMIC waves preferably occurred during storms and their recovery phases at subauroral regions within an average magnetic latitude of 40&#176;-55&#176;. There were more wave events during more intense and longer period storms. However, the correlation between event number and storm duration was not good. This might be due to the effect of heavy oxygen ions on EMIC wave generation and the loss of ring current high-energy ions by the EMIC waves. There are obvious magnetic local time (MLT) differences in the peak occurrence frequency of EMIC waves during storm phases. The enhanced solar wind dynamic pressure was favorable for duskside EMIC waves. With an increased substorm activity the wave occurrence rate peak shifted from the morning side to the dusk-premidnight sector. During the recovery phase of a storm, EMIC waves in the 12-24 MLT sector appeare preferably in the earlier part than those in the 00-12 MLT sector. This shift in local time is related to the eastward rotation of the plasmaspheric plume towards morning during the late storm recovery phase and its overlap with the ring current.&#160; Highest occurrence frequency of the storm time EMIC waves could be found in the South Atlantic Anomaly region, which might be related to the drift shell splitting </span></div><div><span>and the wave propagation effect </span><span>in the weak magnetic field region</span></div><div><span>.</span></div>

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Section: Storm Phase Dependent Emic Wave Occurrences In Different Local Time Sectorssupporting

confidence: 90%

Local time and longitudinal differences in the occurrence frequency of ionospheric EMIC waves during magnetic storm periods

Wang¹,

He²,

Luehr³

2021

Preprint

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“…After subtracting the background magnetic field from the original data, we converted the derived fluctuating field into a field‐aligned coordinate system to obtain the component parallel to the background magnetic field and two components perpendicular to the magnetic field. Through the fast Fourier transform (the number of 50‐HZ data points used are 2,048), the wave spectrum was revealed for the parallel and perpendicular components, separately (For details it can be referred to Wang et al., 2019). The spectrum of the parallel component represents that of the parallel wave, while the total spectrum of the perpendicular components represents that of the transverse wave.…”

Section: Satellite Data and Processing Methodsmentioning

confidence: 99%

“…EMIC waves occur frequently during geomagnetic disturbance periods (Erlandson & Ukhorskiy, 2001; Wang et al., 2021). Whether EMIC waves occur frequently in the main phase or recovery phase of geomagnetic storms remains controversial (Halford et al., 2010; Kim, Hwang, Park, Bortnik, & Lee, 2018; Saikin et al., 2016; Wang et al., 2016, 2019). During the main phase of the storm, the number of energetic particles injected from the plasma sheet increases, providing additional free energy for the generation of EMIC waves.…”

Section: Introductionmentioning

confidence: 99%

Magnetic Local Time and Latitude Distribution of Ionospheric Large‐Spatial‐Scale EMIC Wave Events: Swarm Observations

et al. 2022

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In the present work, the magnetic local time and latitude (MLT and MLat) distributions of ionospheric large‐spatial‐scale (>20° MLat) electromagnetic ion cyclotron waves were investigated using high‐resolution 50‐Hz geomagnetic field data from Swarm A and B satellites. Both parallel and transverse waves were studied in a comparative manner for different geomagnetic activities and seasons. Frequent occurrences of large‐spatial‐scale waves in the South Atlantic Anomaly and North America, where the parallel waves propagate over the longest distance, were observed. Waves appear mostly in the 02–10 MLT sector wherein the pre‐noon parallel waves propagate farthest in latitudinal range. With the enhancement of geomagnetic activity, both transverse and parallel waves increase in occurrence. The dayside occurrence rate is higher during weak geomagnetic activity, whereas the situation is reversed on the nightside and duskside. The dayside waves are located outside the mid‐latitude trough, and the nightside waves are located near (inside) the equatorward boundary of the mid‐latitude trough. Large‐spatial‐scale waves tend to occur at the equinoxes when the absolute value of the dipole tilt angle is less than 10°, while the long‐distance transmission in the waveguide occurs in the pre‐noon in summer. Parallel waves propagate in the region where the electron density is higher than that of the transverse waves. There is a close relationship between EMIC wave and electron density oscillation.

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“…µ EMIC ª §Ö. Â , 2015 6 È §×Ò, £ÀÄª EMIC Ù [25] , ¬Ñ¯ ¢ È . µ £À ¶¢, ÍÈ×Ñ Ð¿ ÑÑ Ô ¢¼² Ñ ßÛ, ªEMIC [5,7,30,31] .…”

Section: ¨71%unclassified

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

Sun¹,

Wang²,

He³

2021

CJSS

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By using high-resolution (50 Hz) magnetic field observations from Swarm constellation, the temporal and spatial characteristics of Electromagnetic Ion Cyclotron (EMIC) waves in different local time sectors at mid-latitudes are investigated during the magnetic storm period of 16−25 March 2015. There are comparable number of EMIC wave events in the dawn and dusk sectors, while there are more EMIC wave events in the pre-noon sector than in the pre-midnight sector. The duskside preference is related to the plasmaspheric plume, while the dawnside preference is related to the enhanced solar wind dynamic pressure and dense cold plasma. The wave frequency in the dawn and pre-noon sectors is higher than that in the dusk and pre-midnight sectors, implying the local time * Ð ¯± ¨ ¾( 41974182, 41431073) 2020-01-10

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Storm Time EMIC Waves Observed by Swarm and Van Allen Probe Satellites

Cited by 18 publications

References 71 publications

Local time and longitudinal differences in the occurrence frequency of ionospheric EMIC waves during magnetic storm periods

Local time and longitudinal differences in the occurrence frequency of ionospheric EMIC waves during magnetic storm periods

Magnetic Local Time and Latitude Distribution of Ionospheric Large‐Spatial‐Scale EMIC Wave Events: Swarm Observations

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

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