A study of GPS ionospheric scintillations observed at Shenzhen

Linfeng, Huang; Wang, Jinsong; Jiang, Yong; Zhou, Chen; Zhao, Kai

doi:10.1016/j.asr.2014.08.023

Cited by 11 publications

(10 citation statements)

References 33 publications

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“…The occurrence preferences of scintillations indicate that the irregularities drift along field lines from equatorial latitude to higher latitudes and cause scintillations away from the equator to the EIA crest region and beyond. Similar results were reported by Deng et al () over Guangzhou (23.16°N, 113.34°E) and by Huang et al () over Shenzhen (22.59°N, 113.97°E), two stations located at the northern crest of EIA in southern China. Deng et al () noticed maximum occurrence within 25°–50° elevation and 120°–210° azimuth in the south sector of the station.…”

Section: Resultssupporting

confidence: 90%

“…Deng et al () noticed maximum occurrence within 25°–50° elevation and 120°–210° azimuth in the south sector of the station. Similarly, Huang et al () obtained the highest occurrence in low elevation and in the azimuth range 135°–270°, which was also the south sector to the station. Because the equatorial F layer irregularities drift along the field lines, the higher the altitudes of plasma bubbles over the equator, the larger is the latitudinal extent of irregularities.…”

Section: Resultsmentioning

confidence: 59%

“…The percentage occurrence along a particular direction is calculated here as the ratio between the time for which scintillations occur along that direction to the total time for which scintillations occur in that period. Over Port Blair the occurrence is higher (61%) in the northern sector of the sky, while over Aizawl, Kohima, and Dibrugarh a higher value of occurrence is observed in the southern Similarly, Huang et al (2014) obtained the highest occurrence in low elevation and in the azimuth range 135°-270°, which was also the south sector to the station. Because the equatorial F layer irregularities drift along the field lines, the higher the altitudes of plasma bubbles over the equator, the larger is the latitudinal extent of irregularities.…”

Section: Journal Of Geophysical Research: Space Physicsmentioning

confidence: 85%

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Spatial Features of L‐Band Equinoctial Scintillations From Equator to Low Midlatitude at Around 95°E During 2015–2016

et al. 2018

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The nature and extent of the irregularities causing L‐band nighttime scintillations at a group of five stations Dibrugarh (27.5°N, 95°E, 43° dip), Kohima (25.6°N, 94.1°E, 39° dip), Aizawl (23.7°N, 92.8°E, 36° dip), Port Blair (11.6°N, 92.7°E, 9° dip), and Cocos Islands (12.2°S, 96.8°E, 43° dip) from the northern low midlatitudes to southern midlatitudes along 95°E meridian is investigated. Global Navigation Satellite System/Global Positioning System/ionosonde measurements during the equinoctial months of 2015–2016 have been utilized. The northernmost station Dibrugarh and the southernmost station Cocos Islands are magnetically conjugate. Scintillations occur more frequently around the equatorial ionization anomaly crest where the background charge density (total electron content crest‐to‐trough ratio) plays an important role. It is also observed that L‐band scintillations around this sector decrease considerably from equinoctial months of 2015 to equinoctial months of 2016. The anomalous El Niño‐Southern Oscillation and quasi‐biennial oscillation recorded during the 2015–2016 winter might have contributed partly to the suppression of irregularities (and hence scintillations) in the succeeding equinox. Strong pre‐midnight scintillations when triggered by equatorial spread F occur simultaneously at all stations. The zonal/vertical drift velocities of irregularities estimated from the time delay of occurrence of scintillations decrease from postsunset to midnight hours. On the other hand, simultaneous sporadic E and post‐midnight scintillations occur over Dibrugarh and Cocos Islands in the absence of scintillations at the equator. Azimuthal position of post‐midnight scintillations at these two locations suggests that they are the manifestation of a frontal structure of sporadic E.

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Section: Resultssupporting

confidence: 90%

Section: Resultsmentioning

confidence: 59%

Section: Journal Of Geophysical Research: Space Physicsmentioning

confidence: 85%

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Spatial Features of L‐Band Equinoctial Scintillations From Equator to Low Midlatitude at Around 95°E During 2015–2016

et al. 2018

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“…Recently, Abadi et al (2014) investigated ionospheric scintillations for Indonesia low-latitude region and showed the characteristics of GPS scintillation associated with low-latitude ionospheric disturbances. Huang et al (2014) reported GPS ionospheric scintillation during the phase of rising solar activity from 2010 to 2014 for the low latitude station of Shenzhen (China). In addition, several researchers have used TEC fluctuations (ROTI) to compare with amplitude scintillation (S 4 index) in low-latitude region.…”

Section: Introductionmentioning

confidence: 99%

Climatology of ionospheric scintillation over the Vietnam low-latitude region for the period 2006–2014

Lân

Minh

Amory‐Mazaudier

et al. 2017

Advances in Space Research

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This paper presents the characteristics of the occurrence of ionospheric scintillations at low-latitude, over Vietnam, by using continuous data of three GSV4004 receivers located at PHUT/Hanoï (105.9 o E, 21.0 o N; magnetic latitude 14.4 o N), HUES/Hue (107.6 o E, 16.5 o N; magnetic latitude 9.5 o N) and HOCM/ Ho Chi Minh city (106.6 o E, 10.8 o N; magnetic latitude 3.3 o N) for the period 2006-2014. The results show that the scintillation activity is maximum during equinox months for all the years and depends on solar activity as expected. The correlations between the monthly percentage scintillation occurrence and the F10.7 flux are of 0.40, 0.52 and 0.67 for PHUT, HUES and HOCM respectively. The distribution of scintillation occurrences is dominant in the pre-midnight sector and around the northern crest of the equatorial ionization anomaly (EIA), from the 15 o N to 20 o N geographic latitude with a maximum at 16 o N. The results obtained from the directional analysis show higher distributions of scintillations in the southern sky of PHUT and in the northern sky of HUES and HOCM, and in the elevation angles smaller than 40 o. The correlation between ROTI and S 4 is low and 2 rather good at PHUT (under EIA) than HOCM (near equator). We found better correlation in the post-midnight hours and less correlation in the pre-midnight hours for all stations. When all satellites are considered during the period of 2009-2011, the range of variation of the ration between ROTI and S 4

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“…Huang et al [64] studied the ionospheric scintillation variations over the anomaly region using GPS measurements at the Shenzhen (22.59°N, 113.97°E) station of the Chinese Meridian Project. The L-band scintillation data extend from December 2010 to April 2014.…”

Section: Ionospheric Irregularities and Scintillationsmentioning

confidence: 99%