Relationship between strong range spread<i>F</i>and ionospheric scintillations observed in Hainan from 2003 to 2007

Shi, Jian; Wang, G. J.; Reinisch, B. W.; Shang, Shan‐Zhai; Wang, X.; Zherebotsov, G.; Potekhin, A. Y.

doi:10.1029/2011ja016806

Cited by 58 publications

(76 citation statements)

References 22 publications

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“…As described by Shi et al . [], for SSF conditions, the bottomside depletions reach the topside ionosphere where they are generally classified as plumes [e.g., Kelley , ]. In this situation, field‐aligned F region irregularities at the walls of the depletions produce strong coherent backscatter that appears as SSF on the ionograms [ Sales et al ., ].…”

Section: Methodsmentioning

confidence: 99%

Comparative analysis of spread‐F signature and GPS scintillation occurrences at Tucumán, Argentina

et al. 2013

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We analyze data recorded from October 2010 to September 2011, during the ascending phase of the 24th solar cycle, from an Advanced Ionospheric Sounder‐Istituto Nazionale di Geofisica e Vulcanologia ionosonde and a GPS Ionospheric Scintillation and total electron content (TEC) monitor scintillation receiver, colocated at low latitude in the Southern American longitudinal sector (Tucumán, 26.9°S, 294.6°E, magnetic latitude 15.5°S, Argentina). The site offers the opportunity to perform spread‐F and GPS scintillation statistics of occurrence under the southern crest of the equatorial ionospheric anomaly. Spread‐F signatures, classified into four types (strong range spread‐F (SSF), range spread‐F, frequency spread‐F (FSF), and mixed spread‐F), the phase and amplitude scintillation index (σΦ and S4, respectively), the TEC, and the rate of TEC parameter, marker of the TEC gradients, that can cause scintillations, are considered. The seasonal behavior results as follows: the occurrence of all four types of spread‐F is higher in summer and lower in winter, while the occurrence of scintillations peaks at equinoxes in the postsunset sector and shows a minimum in winter. The correspondence between SSF and scintillations seems to be systematic, and a possible correlation between S4 and FSF peaks is envisaged at the terminator. The investigation focused also on two particular periods, from 12 to 16 March 2011 and from 23 to 29 September 2011, both characterized by the simultaneous presence of SSF signatures and scintillation phenomena, allowing to discuss the role of traveling ionospheric disturbances as a strong candidate causing ionospheric irregularities.

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Section: Methodsmentioning

confidence: 99%

Comparative analysis of spread‐F signature and GPS scintillation occurrences at Tucumán, Argentina

et al. 2013

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“…The term “spread F” was coined to give a visual description of the broadened echo traces seen in ionograms. Range spread F (RSF), which is associated with scintillations in radio signals [ Shi et al , 2011] is most prevalent between sunset and local midnight. The initial phase of the RSF development usually begins near the end of the post‐sunset rise (PSSR) of the F layer, which is a consequence of the pre‐reversal enhancement (PRE) of the zonal electric field [e.g., Clemesha and Wright , 1966].…”

Section: Introductionmentioning

confidence: 99%

Ionogram signatures of large‐scale wave structure and their relation to equatorial spread F

Thampi¹,

Tsunoda²,

Jose³

et al. 2012

J. Geophys. Res.

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[1] Observations of signatures of the large-scale wave structure (LSWS) and subsequent development of equatorial spread F (ESF) by using data from a newly installed digital ionosonde at Trivandrum (8.5 N; 77 E; 0.5 N magnetic dip latitude) are presented. The LSWS signatures are observed using the ionograms with echo directions. The 'satellite' traces are shown as echoes from oblique directions, when an upwelling (associated with LSWS) is not directly over the ionosonde location. When an upwelling is centered overhead, and the radius of curvature of the isodensity contours matches the height of reflection, signals from various directions can add in phase to enhance the ionospheric reflection coefficient, and produce another ionogram signature, referred to as multireflected echoes (MREs). It is also shown that the generation of ESF is related to the presence of LSWS. The skymaps also show the presence of small-scale wave structures in the bottomside F region. The investigation also indicates that the range spread F (RSF) occurs because of the reflections from the embedded smaller-scale structures within the large-scale upwelling.

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“…1 were recorded. A spread F, which could be categorized as strong-range spread F (Shi et al 2011;Alfonsi et al 2013), was observed at 01:10 UT ( Fig. 3b) and at 02:40 UT (Fig.…”

Section: Measurements and Data Analysismentioning

confidence: 99%

“…Moreover, equatorial and low-latitude spread F is often associated with plasma bubbles and scintillations of global positioning system (GPS) signals (Chen et al 2006;Shi et al 2011;Alfonsi et al 2013), which may cause inaccuracies in position determination. It is generally accepted that equatorial spread F (ESF) and plasma bubbles result from Rayleigh-Taylor instability triggered during the uplift of the F layer owing to the prereversal enhancement of the eastward (zonal) electric field and development of the steep plasma density gradient as the bottomside ionosphere becomes depleted after sunset (Fejer et al 1999;Stolle et al 2006;Abdu et al 2009a;Kelley 2009).…”

Section: Introductionmentioning

confidence: 99%

“…ESF has been studied by ground-based measurements using optical airglow cameras, radars, ionosondes, and GPS receivers (Haase et al 2011;Fejer et al 1999;Shi et al 2011) and in situ measurements using satellite observations. Either direct in situ measurements of plasma density depletions (Huang et al 2001;Park et al 2005) or their magnetic signatures owing to the diamagnetic effect of plasma can be used to study the properties and distributions of plasma bubbles by satellites (Luhr et al 2003;Stolle et al 2006).…”

Section: Introductionmentioning

confidence: 99%

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Spread F occurrence and drift under the crest of the equatorial ionization anomaly from continuous Doppler sounding and FORMOSAT-3/COSMIC scintillation data

et al. 2016

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A relatively new method based on measurements by multipoint continuous Doppler sounding is applied to study the occurrence rate, propagation velocities, and directions of spread F structures over Tucumán, Northern Argentina, and Taiwan, both of which were under the crest of the equatorial ionization anomaly in 2014. In addition, spread F is studied globally over the same time period from the S4 scintillation index measured onboard FORMOSAT-3/COSMIC (F3/C) satellite. It is shown that the continuous Doppler sounding gives results that are consistent with S4 data and with previous optical, global positioning system (GPS), and satellite measurements. Most of the spread F events were observed from September to March, i.e., during the local summer half of the year in Tucumán, whereas in Taiwan, the highest occurrence rate was observed around equinoxes. The occurrence rate in Tucumán was about four times higher than that in Taiwan. The propagation velocities and directions were estimated from the Doppler shift spectrograms. The spread structures related to spread F propagated roughly eastward at velocities from ~70 to ~200 m s −1 during nighttime hours. The mean observed horizontal velocity was 140 m s −1 over Tucumán and 107 m s −1 over Taiwan. The local times at which the highest velocities were observed roughly correspond to local times with highest values of scintillation index S4, at ~20 to 23 LT. In addition, a comparison of measured drift velocities with neutral wind velocities predicted by models is provided. The observed velocities usually exceeded the horizontal neutral wind velocities predicted by the HWM14 model for the locations and times of observations.

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Relationship between strong range spreadFand ionospheric scintillations observed in Hainan from 2003 to 2007

Cited by 58 publications

References 22 publications

Comparative analysis of spread‐F signature and GPS scintillation occurrences at Tucumán, Argentina

Comparative analysis of spread‐F signature and GPS scintillation occurrences at Tucumán, Argentina

Ionogram signatures of large‐scale wave structure and their relation to equatorial spread F

Spread F occurrence and drift under the crest of the equatorial ionization anomaly from continuous Doppler sounding and FORMOSAT-3/COSMIC scintillation data

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