Correlation between ionospheric strong range spread F and scintillations observed in Vanimo station

Wang, Z.; Shi, Jian; Torkar, K.; Wang, G. J.; Wang, X.

doi:10.1002/2014ja020447

Cited by 17 publications

(13 citation statements)

References 22 publications

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“…Figure 1d gives two examples of the ionograms at 12:45 UT and 13:00 UT, showing that the range spread (diffuse echoes) started from the low-frequency part of F layer echo trace and extended beyond the f o F 2 . This kind of ESF is called strong range spread F (SSF), which has been proven its high correlation with GPS scintillation occurrence at the same station in EIA region by statistical studies (Alfonsi et al, 2013;Shi et al, 2011;Wang et al, 2014) and is identified as a manifestation of EPB. The f o F 2 at Vanimo near 20:00 LT is normally~8 MHz.…”

Section: Case 1: Observation On 1 June 2003 At Vanimomentioning

confidence: 99%

Plasma Blobs Concurrently Observed With Bubbles in the Asian‐Oceanian Sector During Solar Maximum

et al. 2019

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With simultaneous ionospheric measurements from ROCSAT‐1 satellite and ground ionosondes/GPS receivers, three cases of concurrent plasma blobs and bubbles in the same magnetic meridian were observed around 22:30 LT in Asian‐Oceanian sector during solar maximum. Two cases were observed: equatorial spread F (ESF) over Vanimo station (geog. 2.7°S, 141.3°E; geom. 11.2°S, 146.2°W) and plasma blobs around 8.0°S (geom.) on 1 June and 6 October 2003. The other case observed equatorial spread F over Hainan station (geog. 19.5°N, 109.1°E; geom. 9.1°N, 179.1°W) and plasma blob near the dip equator on 8 March 2004. Plasma blobs were all observed near 600‐km height near the equator. Equatorial spread F and amplitude scintillations from the ground stations were observed near the same magnetic meridian, indicating the existence of bubbles. Considering that both plasma bubbles and blobs are field‐aligned elongated structures, magnetic field line mapping shows that in the two cases at Vanimo, blobs were above bubbles, providing direct observational evidence for blob formation in the intermediate stage of plasma bubble evolution; in the case at Hainan, the blob and bubble were likely at similar height, and it could be generated by gravity wave.

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Section: Case 1: Observation On 1 June 2003 At Vanimomentioning

confidence: 99%

Plasma Blobs Concurrently Observed With Bubbles in the Asian‐Oceanian Sector During Solar Maximum

et al. 2019

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“…We can see that the period of the blob observed was within the periods of ionospheric scintillations from the three GPS signals. All three GPS signals showed amplitude scintillations with S 4 > 0.3 which are considered as moderate or strong scintillation [Alfonsi et al, 2013;Wang et al, 2014]. The IPPs of the GPS signal of PRN 6 were the closest one to the plasma blob observed by ROCSAT-1, and the signal showed the strongest scintillation with the highest S 4 index of about 0.9.…”

Section: Analysis and Resultsmentioning

confidence: 93%

“…The scintillation index S 4 is calculated as the standard deviation of the GPS signal power amplitude normalized by its mean value at 1 min resolution [ Kil et al ., ]. The internal receiver noise has been removed, and the amplitude scintillation index is taken as S 4 > 0.3 which is considered as moderate or strong scintillation [ Alfonsi et al ., ; Wang et al ., ]. Only the data obtained above 25° elevation angle are considered, in order to reduce the impact of nonscintillation‐related tracking errors (such as multipath).…”

Section: Methodsmentioning

confidence: 99%

A case study on ionospheric scintillations at low latitude associated with a plasma blob observed in situ

Wang

Shi

Torkar

et al. 2015

Geophysical Research Letters

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In general, ionospheric scintillations at low latitude are considered as signatures of equatorial plasma bubbles (depletions). However, some authors considered that scintillations may also be associated with plasma blobs (enhancements), but there was no in situ measurement hitherto to confirm it. We performed a case study on the concurrent observation of an ionospheric plasma blob with in situ measurements by ROCSAT‐1 (i.e. Formosa satellite‐1) and of GPS amplitude scintillations in the low‐latitude ionosphere on 1 June 2003. The blob measured in situ had a scale size of about 800 km in the F layer, and the ion density inside the blob was severely disturbed. Amplitude scintillation with S4 > 0.3 was observed concurrently in the same longitude range as the blob measured. This case study provides evidence of simultaneously observed GPS amplitude scintillations and a blob in situ, and it confirms that scintillations can be associated with plasma blobs in the low‐latitude ionosphere.

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“…Processing of the GPS-SCINDA data was done using the GPS-TEC application software (Seemala and Valladares 2011). In this study, amplitude scintillations with S4 > 0.3 were considered as relevant scintillation events, similar to Akala et al 2011, Alfonsi et al (2013), and Wang et al (2014). Only S4 data corresponding to ray path elevations above 30° was considered to avoid the multipath effects.…”

Section: Amplitude Scintillation From Gps-scindamentioning

confidence: 99%

Ionospheric irregularities and scintillations: a direct comparison of in situ density observations with ground-based L-band receivers

Aol

Buchert

Jurua

2020

Earth Planets Space

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Ionospheric irregularities can affect satellite communication and navigation by causing scintillations of radio signals. The scintillations are routinely measured using ground-based networks of receivers. This study presents observations of ionospheric irregularities by Langmuir probes on the Swarm satellites. They are compared with amplitude scintillation events recorded by the Global Positioning System-Scintillation Network and Decision Aid (GPS-SCINDA) receiver installed in Mbarara (Lat: $$0.6^{\circ }\hbox {S}$$ 0 . 6 ∘ S , Lon: $$30.8^{\circ }\hbox {E}$$ 30 . 8 ∘ E , Mag. lat: $$10.2^{\circ }\hbox {S}$$ 10 . 2 ∘ S ). The study covers the years from 2014 to 2018 when both data sets were available. It was found that the ground-based amplitude scintillations were enhanced when Swarm registered ionospheric irregularities for a large number of passes. The number of matching observations was greater for Swarm A and C which orbited at lower altitudes compared to Swarm B. However, some counterexamples, i.e., cases when in situ electron density fluctuations were not associated with any observed L-band amplitude scintillation and vice versa, were also found. Therefore, mismatches between observed irregularity structures and scintillations can occur just over a few minutes and within distances of a few tens of kilometers. The amplitude scintillation strength, characterized by the S4 index was estimated from the electron density data using the well-known phase screen model for weak scattering. The derived amplitude scintillation was on average lower for Swarm B than for A and C and less in accordance with the observed range. Irregularities at an altitude of about 450 km contribute strongly to scintillations in the L-band, while irregularities at about 510-km altitude contribute significantly less. We infer that in situ density fluctuations observed on passes over or near Mbarara may be used to indicate the risk that ionospheric radio wave scintillations occur at that site.

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Correlation between ionospheric strong range spread F and scintillations observed in Vanimo station

Cited by 17 publications

References 22 publications

Plasma Blobs Concurrently Observed With Bubbles in the Asian‐Oceanian Sector During Solar Maximum

Plasma Blobs Concurrently Observed With Bubbles in the Asian‐Oceanian Sector During Solar Maximum

A case study on ionospheric scintillations at low latitude associated with a plasma blob observed in situ

Ionospheric irregularities and scintillations: a direct comparison of in situ density observations with ground-based L-band receivers

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