Morphology of NmF2 nighttime increases in the Eurasian sector
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In this article, a statistical analysis of two peaks (premidnight and post-midnight) occurrence in NmF2 daily variations was made on a latitudinal chain of four ionosonde stations in the Eurasian longitudinal sector.Abstract:
A statistical analysis of two peaks (pre-midnight and post-midnight) occurrence in NmF2 daily variations was made on a latitudinal chain of four ionosonde stations in the Eurasian longitudinal sector. Overall 6182 cases of the first and 5600 cases of the second peak occurrence were analyzed using all available foF2 observations for the years of solar maximum and minimum. Well-pronounced and systematic variations with season and solar activity were revealed in the occurrence probability of the peaks, their amplitude and timing. The pattern of both peaks occurrence is similar during winter and equinoxes for midlatitude stations implying one and the same mechanism of their formation. The pre-midnight summer peak shows specific variations in particular during solar maximum pointing to a different mechanism controlling its appearance. Possible mechanisms of both peaks formation are discussed.read more
Citations
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Statistical characteristics of the total ion density in the topside ionosphere during the period 1996-2004 using empirical orthogonal function (EOF) analysis
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Global morphology of night-time Nm F2 enhancements
TL;DR: In this article, an overall statistical study of night-time enhancements of NmF2 has been carried out, where all available foF2 observations since 1955 at 53 ionosonde stations distributed worldwide in the latitude range f geom = 15° - 60° were used in the analysis.
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Midlatitude nighttime enhancement in F region electron density from global COSMIC measurements under solar minimum winter condition
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A case study of postmidnight enhancement in F-layer electron density over Sanya of China
TL;DR: In this paper, the authors analyzed the manually scaled ionogram records measured by a Lowell DPS-4D ionosonde operated at Sanya (18.3°N, 109.6°E), China, to explore post-midnight enhancement events occurred in 2012, a year of moderate solar activities.
Morphology of quiet time F2-layer disturbances: High to lower latitudes
A. V. Mikhailov,A. Kh +1 more
TL;DR: In this paper, the authors analyzed ionospheric F2-layer disturbances not related to geomagnetic activity (Q disturbances) using all available NmF2 observations over 26 Northern Hemisphere high-tolower latitude ionosonde stations.
References
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Journal ArticleDOI
Vector measurements of F region ion transport at Arecibo
TL;DR: In this article, the ion transport velocity in the F region above Arecibo (18°N, 50° dip angle) is reported for two daytime and five nighttime periods.
Journal ArticleDOI
Influence of electromagnetic drifts and neutral air winds on some features of the F sub 2 region
TL;DR: In this article, the authors derived the electron continuity equation from electron continuity equations using the Jacchia model atmosphere and the neutral air winds effects on the F 2 region derived from electron continuoustime equation.
Journal ArticleDOI
An updated climatology of thermospheric neutral winds and F region ion drifts above Millstone Hill
M. J. Buonsanto,Olivier Witasse +1 more
TL;DR: In this paper, the main effect of increased magnetic activity is an enhancement of the usual nighttime westward ion drift, which affects the ion drag and apparently also the relative importance of the EUV and high latitude heat sources.
Journal ArticleDOI
Nighttime meridional neutral winds near 350 km at low to mid-latitudes
TL;DR: In this paper, the meridional component of the neutral wind is inferred from the ion velocity component along the magnetic field and simultaneously measured electron density profiles and electron and ion temperatures.
Journal ArticleDOI
The F2-layer at middle latitudes
TL;DR: In this article, a detailed numerical study is made of the physical and chemical processes which determine the structure of the F2-layer at middle latitudes, with measured values of solar flux, absorption cross-sections, and chemical rate constants for input data.