Comparison of global morphologies of vertical ion convergence and sporadic E occurrence rate

Qiu, Lihui; Zuo, Xinxin; Yu, Tao; Sun, Yang‐Yi; Qi, Yifan

doi:10.1016/j.asr.2019.02.024

Cited by 27 publications

(35 citation statements)

References 32 publications

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“…The AR indices show negative values in winter and positive maximum centers in summer, which was not found in the AW index distribution. Similar disagreement between wind shear and sporadic E layer occurrence ratio was also found in the mid-latitude region (Qiu et al, 2019). Fig.…”

Section: Accepted Articlesupporting

confidence: 82%

Difference in the Sporadic E Layer Occurrence Ratio Between the Southern and Northern Low Magnetic Latitude Regions as Observed by COSMIC Radio Occultation Data

Niu

2021

Space Weather

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In this paper, the difference in the sporadic E layer occurrence ratio between two low-magneticlatitude (±5°-±15°) regions is analyzed by using COSMIC scintillation observations covering the period from 2007.001-2017.365. Obvious longitudinal, seasonal and LT dependencies of this phenomenon are found. Most features of the differences between two hemispheres could be explained by the difference in zonal vertical wind shear between the two hemispheres induced by the difference between the magnetic and geographic latitudes of the studied regions. This result also indicates that the wind shear mechanism still dominates sporadic E layer formation in lowmagnetic-latitude regions.

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Section: Accepted Articlesupporting

confidence: 82%

Difference in the Sporadic E Layer Occurrence Ratio Between the Southern and Northern Low Magnetic Latitude Regions as Observed by COSMIC Radio Occultation Data

Niu

2021

Space Weather

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“…June 2020 (summer solstice) under geomagnetic quiet condition ( Figure S1). It can be expected that the Es layer highly occurs over Asia in the summer (Qiu et al 2019).…”

Section: Accepted Articlementioning

confidence: 99%

“…A moon shadow of an annular solar eclipse passed through eastern China from ∼06:00 to ∼09:00 UT on 21 June 2020 (summer solstice) under geomagnetic quiet condition ( Figure S1). It can be expected that the E s layer highly occurs over Asia in the summer (Qiu et al, 2019). Accordingly, the June 2020 eclipse is another great opportunity for investigating the E s response to the eclipse.…”

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confidence: 99%

Multilayered Sporadic‐E Response to the Annular Solar Eclipse on June 21, 2020

et al. 2021

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A moon shadow of annular solar eclipse passed through East Asia in the afternoon on 21 June 2020, which was a good opportunity to study the rapid ionospheric response to the solar radiation variations. In the study, the high-frequency echoes recorded by the ionosondes at Wuhan (82.4% obscuration), Xiamen (97.8% obscuration), and Nanning (81.1% obscuration) are analyzed to examine the variations in sporadic-E (Es) during the obscuration over the East China area. The echoes show not only the variations in the typical signal Es layer below 130 km, but for the first time also the multilayered Es at much higher altitudes (130-190 km) during the eclipse. Specifically, the multilayered Es is only observed over Nanning, while different Es behaviors are observed in the other two stations. The relationship between the formation of the multilayered Es and the uplifted Es near the center path of the moon shadow are examined in the study. The small-scale atmospheric gravity waves play a key role in modulating the Es behaviors during the eclipse. Key points: 1. The unexpected multilayered Es is observed by the ionosonde over Nanning (southern 81.1% obscuration) after the maximum obscuration. 2. The occurrence of small-scale AGWs due to the eclipse should result in the multilayered Es at altitudes from 130 km to 190 km. 3. The Es layer uplifts significantly over Xiamen (97.8% obscuration) near the maximum obscuration.

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“…Using geographical neutral wind velocities, U and V used in equation ( 1) are expressed as follows (Qiu et al, 2019):…”

Section: Gaia Model Simulation Data Analysismentioning

confidence: 99%

Comparison of the Tidal Signatures in Sporadic E and Vertical Ion Convergence Rate, Using FORMASAT-3/COSMIC Radio Occultation Observations and GAIA Model

Sobhkhiz-Miandehi

Yamazaki

Arras

et al. 2021

Preprint

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Sporadic E or Es is a transient phenomenon where thin layers of enhanced electron density appear in the ionospheric E region (90-120 km altitude). The neutral wind shear caused by atmospheric tides can lead ions to converge vertically at E-region heights and form the Es layers. This research aims to determine the role of atmospheric solar and lunar tides in Es occurrence. For this purpose, radio occultation data of FORMASAT-3/COSMIC have been used, which provides complete global coverage of Es events. Moreover, GAIA model simulations have been employed to evaluate the vertical ion convergence induced by solar tides. The results show both migrating and non-migrating solar tidal signatures and the semidiurnal migrating lunar tidal signature in Es occurrence. The seasonal variation of the migrating solar tidal components of Es is in good agreement with those in the vertical ion convergence derived from GAIA. Furthermore, some non-migrating components of solar tides, including semidiurnal westward wavenumbers 1 and 3 and diurnal eastward wavenumbers 2 and 3, also significantly affect the Es occurrence rate.

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Comparison of global morphologies of vertical ion convergence and sporadic E occurrence rate

Cited by 27 publications

References 32 publications

Difference in the Sporadic E Layer Occurrence Ratio Between the Southern and Northern Low Magnetic Latitude Regions as Observed by COSMIC Radio Occultation Data

Difference in the Sporadic E Layer Occurrence Ratio Between the Southern and Northern Low Magnetic Latitude Regions as Observed by COSMIC Radio Occultation Data

Multilayered Sporadic‐E Response to the Annular Solar Eclipse on June 21, 2020

Comparison of the Tidal Signatures in Sporadic E and Vertical Ion Convergence Rate, Using FORMASAT-3/COSMIC Radio Occultation Observations and GAIA Model

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