Morphological Characteristics of Equatorial Ionization Anomaly Crest Over Nanning Region

Mo, Xiaohua; Zhang, Donghe; Liu, Jing; Hao, Yongqiang; Ye, J. F.; Qin, Jiayin; Wei, Wan; Xiao, Zuo

doi:10.1002/2017rs006386

Cited by 22 publications

(35 citation statements)

References 27 publications

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“…The GPS data observed at two ground‐based GPS stations, GUAN (Guangzhou) (23.19°N, 113.34°E, MLAT ~ 12.52°N) in China sector and KOUR (Kourou) (5.25°N, 52.8°W, MLAT ~ 14.65°N) in Brazilian sector, are used to derive the location of daytime EIA crest. Although it is generally agreed that the average MLAT location of northern EIA crest is usually about 15°N, it is only about 10–12°N in China sector (Mo et al, ). Since both GUAN and KOUR GPS stations are near northern EIA crest in their respective longitudinal sectors, a number of GPS satellite‐receiver observation arcs will pass through the EIA crest region.…”

Section: Methodsmentioning

confidence: 99%

Lunar Tidal Modulation of Periodic Meridional Movement of Equatorial Ionization Anomaly Crest During Sudden Stratospheric Warming

Zhang

2018

JGR Space Physics

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Using the location of equatorial ionization anomaly (EIA) crest derived from GPS observations in China and Brazilian sector, we investigated the longitudinal dependence of periodic meridional movement of EIA crest during sudden stratospheric warming events in 2003, 2006, and 2009. The solar activity was from high to low for the three events. Results show that the locations of EIA crests in both China and Brazilian sectors exhibit obvious and constant 14‐ to 15‐day periodic oscillation being in‐phase in two sectors, which coincide with the half of the lunar revolution period (29.53 days) and the lunar phase. The temporal extent of wave power at 14–15 days is consistent with the temporal extent of stratospheric zonal wind, indicating that 14‐ to 15‐day periodic meridional movement of EIA crest is due to enhanced lunar tide modulated by zonal wind. In addition, it is also found that the amplitude of 14‐ to 15‐day periodic oscillation of EIA crest in China sector is larger than that in Brazilian sector, which may be caused by the longitudinal variation of tides and neutral wind pattern.

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Section: Methodsmentioning

confidence: 99%

Lunar Tidal Modulation of Periodic Meridional Movement of Equatorial Ionization Anomaly Crest During Sudden Stratospheric Warming

Zhang

2018

JGR Space Physics

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“…Huang et al (1989) found the correlation coefficients between maximum EEJ strength and EIA crest latitude are higher than that between maximum EEJ strength and EIA crest magnitude, and they concluded that the electron density distribution is more directly affected by the E field than the peak electron density. Using the EIA crest derived from GPS data observed at China region from 2006 to 2015, we found that the correlation of the EIA location with EEJ strength is better than the EIA crest TEC with EEJ strength (Mo et al, 2018).…”

Section: Discussionmentioning

confidence: 99%

“…Journal of Geophysical Research: Space Physics amplitude of 6-day oscillation in EEJ and hmF2 during September-October 2004 is roughly equivalent to that during April-May 2003, the amplitude of 6-day oscillation in EIA crest location during April-May 2003 is about twice as much as that during September-October 2004. The reason may be that although the EIA is formed by equatorial fountain effect, it is also influenced by other factors, such as photochemical process and trans-equatorial wind (Mo et al, 2018).…”

Section: 1029/2020ja028225mentioning

confidence: 99%

Six‐Day Periodic Variation in Equatorial Ionization Anomaly Region

Zhang

2020

JGR Space Physics

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Using the location of equatorial ionization anomaly (EIA) crest derived from GPS observations and CHAllenging Minisatellite Payload (CHAMP) satellite measurement, along with the F2 layer peak height (hmF2), critical frequency (foF2), and the equatorial electrojet (EEJ) in India and China longitudinal sectors, we found the obvious 6-day oscillation in these ionospheric parameters during 16 April to 31 May 2003 and 21 September to 26 October 2004. The tidal amplitudes of EEJ are enhanced during the positive phase of the 6-day waves and are weakened during its negative phase. Since the strong 6-day planetary wave activities in mesosphere and lower thermosphere (MLT) region during these two events have been reported by earlier studies, this 6-day oscillation in EIA region can be due to the interaction of enhanced planetary waves with the tidal wind. Moreover, the temporal variations of this 6-day wave are consistent and in phase in these ionospheric parameters, indicating that the 6-day planetary wave modulates electric fields via E region wind dynamo, thereby altering the vertical height and horizontal distribution of electron densities through upward E × B drift, which results in the periodical variations in these ionospheric parameters in F region. These observation results provide insight into how the 6-day planetary waves modulate the ionospheric morphological structure.

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“…Mo XH et al (2018) studied the features of EIA crests by using the ionospheric TEC data observed from 2006 to 2015 at Nanning (22.84°N, 108.33°E). Both the value of TEC and the location of the northern EIA crest have a positive solar activity dependence and show a semi‐annual variation, larger in equinoctial months than in solstitial months.…”

Section: Ionospheric Structures and Climatologymentioning

confidence: 99%

“…Day‐to‐day variations of the location of the northern EIA crest and the strength of EEJ from 2006 to 2015. After MO X et al (2018). …”

Section: Ionospheric Structures and Climatologymentioning

confidence: 99%

Recent ionospheric investigations in China (2018–2019)

Liu

Wan

2020

Earth and Planetary Physics

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Key Points:Ionospheric observations have continuously accumulated with increasing GNSS receivers being installed q Studies of ionospheric climatology and space weather highlight new physical understanding q Study of ionospheric irregularities/scintillations reports interesting features q Abstract: Since the release of the 2018 National Report of China on ionospheric research ( Liu LB and Wan WX, 2018) to the Committee on Space Research (COSPAR), scientists from Mainland China have made many new fruitful investigations of various ionospheric-related issues. In this update report, we briefly introduce more than 130 recent reports ( [2018][2019]. The current report covers the following topics: ionospheric space weather, ionospheric structures and climatology, ionospheric dynamics and couplings, ionospheric irregularity and scintillation, modeling and data assimilation, and radio wave propagation in the ionosphere and sounding techniques. ΔV para (m/s) SYM-H (nT) V para (m/s) V para (m/s) ΔV para (m/s) Figure 2. (a) The SYM-H index on 13-17 July 2012. The blue line marks the storm onset (at 06:42 UT on 15 July); yellow and gray areas indicate the 24-hour storm-time and 24-hour quiet-time intervals. (b) The blue dots denote the storm-time equatorial field-aligned plasma drifts observed by C/NOFS with red curve representing median and red lines denoting upper and lower quartile values. (c) Same as panel (b), but for the 24-hour quiet time interval. (d) The difference between (b) and (c). (e-h) Same as panels (a-d), but for the case on 7-11 July 2012 where the 24-hour quiet and storm intervals start at 04:12 UT on 7 and 9 July, respectively, after Zhang R et al. (2018). Earth and Planetary Physics

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Morphological Characteristics of Equatorial Ionization Anomaly Crest Over Nanning Region

Cited by 22 publications

References 27 publications

Lunar Tidal Modulation of Periodic Meridional Movement of Equatorial Ionization Anomaly Crest During Sudden Stratospheric Warming

Lunar Tidal Modulation of Periodic Meridional Movement of Equatorial Ionization Anomaly Crest During Sudden Stratospheric Warming

Six‐Day Periodic Variation in Equatorial Ionization Anomaly Region

Recent ionospheric investigations in China (2018–2019)

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