spread-F
The spread F Experiment (SpreadFEx): Program overview and first results
... (the spread F Experiment, or SpreadFEx) from September to November 2005 to attempt to define the role of neutral atmosphere dynamics, specifically wave motions propagating upward from the lower atmosphere, in ...
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A statistical study of satellite traces and evolution of equatorial spread F
... equatorial spread F (ESF) and satellite traces (STs) which are assumed to represent tilts in the bottomside iso-electron density surfaces probably caused by large-scale wave-like structures ...bottomside ...
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Effects of the postsunset vertical plasma drift on the generation of equatorial spread F
... of spread F using the radar at Jicamarca and found that strong scattering from field aligned irregularities (spread F irregularities) com- pletely masked the incoherent scatter ...from ...
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Statistical analysis of low latitude spread F observed over Puer, China, during 2015–2016
... Previous observational evidences suggested that SF at low latitudes is due to the diffusion of the equatorial plasma bubbles along magnetic field lines (Kelly 2009). Manju et al. (2011) and Wang et al. (2015) also ...
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Impact of disturbance electric fields in the evening on prereversal vertical drift and spread F developments in the equatorial ionosphere
... the spread F was also generally more intense although a clear proportionality between them could not be established, which is to be expected since the ESF instability growth would depend also upon factors ...
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Fast and ultrafast Kelvin wave modulations of the equatorial evening F region vertical drift and spread F development
... of spread F/plasma bubble ...the F region evening vertical drift and spread F (ESF) development features as diagnosed by Digisonde (Lowell Digisonde International, LLC, Lowell, MA, USA) ...
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Day-to-day and short-term variabilities in the equatorial plasma bubble/spread F irregularity seeding and development
... the F layer at a velocity approaching 1000 m/s over Brazil that was driven by an intense eastward electric field of ~ 30 mV/m did not produce any UHF (GPS) scin- tillation or enhanced spread F in ...
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Observation of seasonal asymmetry in the range spread F occurrence at different longitudes during low and moderate solar activity
... Dabas et al., 2003; Lee et al., 2005). The PRE rapidly ele- vates the ionosphere into a higher-altitude region, where the collision frequency is lower and more conducive for further plasma depletion growth by the R–T ...
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The seasonal and solar cycle variations of electron density gradient scale length during magnetically disturbed days: implications for Spread F
... Equatorial Spread F (ESF) is a spectacular phenomenon in which the equatorial region ionosphere is transformed after ...the F region also influence satellite-based communication navi- gation systems, ...
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Upwelling: a unit of disturbance in equatorial spread F
... A question that remains, is why do we observe small- scale irregularities (< few km) along the west wall of an upwelling, at a time when EPBs appear to be sup- pressed? One possibility is that the vector direction of ...
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Longitudinal differences in the statistical characteristics of ionospheric spread F occurrences at midlatitude in Eastern Asia
... in F layer of ionosphere and can usually be clas- sified as frequency spread-F (FSF) and range spread-F ...of spread-F occurrences at midlatitudes in Eastern Asia, ...
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Quantitative estimates of relationships between geomagnetic activity and equatorial spread F as determined by TID occurrence levels
... ionosphere. Spread-F was originally defined in terms of these extra ionogram traces, although the term is now more generally used to apply to nighttime disturbance ...
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Spread F occurrences and relationships with foF2 and h′F at low and mid latitudes in China
... The HK and GZ sites lie near the north crest of the equatorial ionization anomaly (EIA) zone. The EIA zone is where the fountain effect phenomena and the equato- rial electrojet often interact resulting in complicated ...
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Nonlinear saturation of Rayleigh-Taylor instability and generation of shear flow in equatorial spread-F plasma
... In the literature there exists a systematic numerical simu- lation (Zalesak et al., 1982) for the evolution of the spread F bubbles consistent with experimentally measured ESF envi- ronment. This phenomena ...
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The Low latitude Spread-F over the African and the Southern American sector during a low Solar Activity Period
... Equatorial Spread-F (ESF) observation of the African sector with the Southern American sector using digisonde data from each of the ...of spread F were well represented in all the three ...
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Engagement of platelet integrins "β3" and "β1". triggers two distincts signal pathways with different susceptibilities to nitric oxide
... not spread were not permitted to form close contacts with the ...o f GSNO ...already spread cells had occurred. Only 3 o f the 5 cells were detected at 10 mins since they had measurable ...
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Floristic Analysis of Dogrose Species Spread in the Flora of Nakhchivan Autonomous Republic
... Undoubtedly, carried out researches do not reflect the species completely belonging to Rosa L genus spread in the territory of Nakhchivan AR. In our further researches, exploration of those species in detail is ...
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Reproductive efficiency in dairy cattle calving during autumn or spring : a thesis presented in partial fulfilment of the requirements for the degree of Master of Applied Science in Animal Science, Institute of Veterinary, Animal and Biomedical Sciences, Massey University
... lt has been hypothesised that events occurring prior to maternal recogn ition of pregnancy, and possibly prior to fertilisation, may determine embryo viability. S ince the ovulatory follicle develops under maternal ...
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Tyrosine Residues in the Cytoplasmic Domains Affect Sorting and Fusion Activity of the Nipah Virus Glycoproteins in Polarized Epithelial Cells
... subsequent spread to underlying tissue and dissemination via the blood ...the spread of infection at the virus entry site but also by disrupting the epithelial barrier in the respiratory tract, facilitating ...
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Can Health 2.0 Address Critical Healthcare Challenges? Insights from the Case of How Online Social Networks Can Assist in Combatting the Obesity Epidemic
... the spread of obesity within traditional (offline) social networks (Christakis & Fowler, 2007; Fowler & Christakis, ...person-to-person spread of obesity within social networks has been suggested ...
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