The time delay between the equatorial ionization anomaly and the equatorial electrojet in the eastern Asian and American sectors

Liu, Jing; Zhang, Donghe; Hao, Yongqiang; Xiao, Zuo

doi:10.1016/j.asr.2021.10.004

Cited by 4 publications

(2 citation statements)

References 16 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The latitude of the maximum TEC also moves toward the equator. After sunset, the spatial variation of TEC becomes very small, displaying the typical characteristics of the equatorial ionization anomaly (EIA) in the ionosphere in terms of local time evolutions in this region (J. Liu et al., 2022).…”

Section: Results and Analysismentioning

confidence: 99%

Revisiting the Ionospheric Disturbances Over Low Latitude Region of China During Super Typhoon Hato

Li,

Zhang,

Zeng

et al. 2024

Space Weather

Self Cite

View full text Add to dashboard Cite

The ionosphere exhibits complex variations due to the influences from above and below. To distinguish the source of ionospheric disturbances is important for understanding the variation process and the coupling mechanism among different regions. Using the ionospheric total electron content (TEC) derived from Global Navigation Satellite System observations, the ionospheric disturbances during the super typhoon Hato in 2017 that was accompanied by a weak geomagnetic storm are revisited, including the ionospheric deviation and traveling ionospheric disturbances (TIDs). It is found that the ionospheric TEC in the low‐latitude region of China experienced a significant enhancement (200% compared to the quiet geomagnetic day) on Hato landing day. This enhancement covers the northern and southern equatorial ionization anomaly (EIA) region from 80°E to 180°E. Considering the geomagnetic condition, the hmF2 and the O/N2 ratio in thermosphere, it is concluded that this enhancement is not related to the typhoon, but to the coinciding weak geomagnetic storm. Additionally, several medium‐scale TIDs are verified from differential TEC data in China low latitude region during Hato period. Most of them occur after sunset and their propagating direction is southwest that often occur in East‐Asian sector in summer months, which are not related to the typhoon. While a few TIDs with concentric wavefront (Concentric TIDs) are also observed on the day before Hato landfall that should be excited in the deep convective region of the typhoon. Because the ionosphere is affected by disturbances both from above and below, it should be careful to determine the source of the ionospheric disturbances.

show abstract

Section: Results and Analysismentioning

confidence: 99%

Revisiting the Ionospheric Disturbances Over Low Latitude Region of China During Super Typhoon Hato

Li,

Zhang,

Zeng

et al. 2024

Space Weather

Self Cite

View full text Add to dashboard Cite

show abstract

“…We further calculated the mean EEJ intensity between 06:00–14:00 LT in each day as the daily value to compare with the latitudinal location of the daytime most developed EIA crest. This considers that there is a response time of several hours between the EEF variation and EIA crest variation (Iyer et al., 1976; Jose et al., 2011; Liu et al., 2021; Stolle et al., 2008; Venkatesh et al., 2015) and the occurrence time of the daytime most developed northern EIA crest in this sector is around 14:30 LT (Liu, Zhang, Mo, et al., 2020). Also, we focus on geomagnetic quiet days (Kp < 3) during low solar activity period (year 2008 and 2009).…”

Section: Methodsmentioning

confidence: 99%

Controlling Factors of the Seasonal Variation of the Latitudinal Location of the Equatorial Ionization Anomaly Crest

Liu,

Zhang,

et al. 2024

JGR Space Physics

Self Cite

View full text Add to dashboard Cite

The latitudinal location of the Equatorial Ionization Anomaly (EIA) crest has seasonal variation, and there are disagreements on the interpretation of such seasonal characteristic in previous studies. Some studies suggested that this seasonal characteristic is determined by the seasonal characteristic of the equatorial electric field. Others suggested that this seasonal characteristic is determined by the seasonal changes of the thermospheric wind. The current paper uses Total Electron Content (TEC) data and the Thermosphere Ionosphere Electrodynamics General Circulation Model (TIEGCM) to analyze the seasonal variation of the northern EIA crest in the eastern Asian sector under low solar activity. Our results show that the monthly averaged latitudinal location of the northern EIA crest has a good linear relationship (r = 0.74) with the monthly averaged Equatorial Electrojet (EEJ) intensity, which is a commonly used proxy of the eastward electric field. However, TIEGCM simulations with and without F‐region wind indicate that such a relationship might be attributed to wind effects. Additionally, the linear relationship between the EEJ intensity and the northern‐southern EIA crest distance is not significant (r = 0.47) in the eastern Asian sector. Our results suggest that a good correspondence between the eastward electric field and the latitudinal location of the EIA crest is not assured annually, as the seasonally varying F‐region wind significantly influences EIA evolution.

show abstract

Response of the ionosphere to equatorial electrojet at latitudes near the northern EIA crest in the East African longitudinal sector

Alemu,

Kassa

2024

Advances in Space Research

View full text Add to dashboard Cite

The time delay between the equatorial ionization anomaly and the equatorial electrojet in the eastern Asian and American sectors

Cited by 4 publications

References 16 publications

Revisiting the Ionospheric Disturbances Over Low Latitude Region of China During Super Typhoon Hato

Revisiting the Ionospheric Disturbances Over Low Latitude Region of China During Super Typhoon Hato

Controlling Factors of the Seasonal Variation of the Latitudinal Location of the Equatorial Ionization Anomaly Crest

Response of the ionosphere to equatorial electrojet at latitudes near the northern EIA crest in the East African longitudinal sector

Contact Info

Product

Resources

About