Annual and semiannual variations in the ionospheric F2-layer : I. Modelling
L. Zou,Henry Rishbeth,I. C. F. Müller-Wodarg,I. C. F. Müller-Wodarg,Alan D. Aylward,G. H. Millward,G. H. Millward,G. H. Millward,Tim Fuller-Rowell,D. W. Idenden,R.J. Moffett +10 more
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In this paper, Rishbeth et al. compared with the coupled thermosphere-ionosphere-plasmasphere computational model (CTIP) for geomagnetically quiet conditions.Abstract:
Annual, seasonal and semiannual variations of F2-layer electron density (NmF2) and height (hmF2) have been compared with the coupled thermosphere-ionosphere-plasmasphere computational model (CTIP), for geomagnetically quiet conditions. Compared with results from ionosonde data from midlatitudes, CTIP reproduces quite well many observed features of NmF2, such as the dominant winter maxima at high midlatitudes in longitude sectors near the magnetic poles, the equinox maxima in sectors remote from the magnetic poles and at lower latitudes generally, and the form of the month-to-month variations at latitudes between about 60°N and 50°S. CTIP also reproduces the seasonal behaviour of NmF2 at midnight and the summer-winter changes of hmF2. Some features of the F2-layer, not reproduced by the present version of CTIP, are attributed to processes not included in the modelling. Examples are the increased prevalence of the winter maxima of noon NmF2 at higher solar activity, which may be a consequence of the increase of F2-layer loss rate in summer by vibrationally excited molecular nitrogen, and the semiannual variation in hmF2, which may be due to tidal effects. An unexpected feature of the computed distributions of NmF2 is an east-west hemisphere difference, which seems to be linked to the geomagnetic field configuration. Physical discussion is reserved to the companion paper by Rishbeth et al.read more
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Patterns of F2-layer variability
TL;DR: In this paper, the authors used ionosonde data from thirteen stations to study the day-to-day variability of the peak F2-layer electron density, NmF2, which they use to define quantitative descriptions of variability versus local time, season and solar cycle.
Journal ArticleDOI
Annual and semiannual variations in the ionospheric F2-layer: II. Physical discussion
Henry Rishbeth,I. C. F. Müller-Wodarg,I. C. F. Müller-Wodarg,L. Zou,Tim Fuller-Rowell,G. H. Millward,G. H. Millward,G. H. Millward,R.J. Moffett,D. W. Idenden,Alan D. Aylward +10 more
TL;DR: In this article, a coupled thermosphere-ionosphere computational model (CTIP) was proposed to explain the variations in the peak F2-layer electron density (NmF2) at midlatitudes.
Journal ArticleDOI
Seasonal and solar cycle variations of the ionospheric peak electron density: Comparison of measurement and models
TL;DR: In this paper, the authors examined the ability of empirical and physical models to reproduce the peak electron density of the midlatitude ionospheric F2 region (NmF2) from 1976 to 1980.
Journal ArticleDOI
Modeling the effects of gravity wave momentum deposition on the general circulation above the turbopause
TL;DR: In this paper, a nonlinear spectral gravity wave (GW) drag parameterization systematically accounting for breaking and dissipation in the thermosphere developed by Yigit et al. has been implemented into the University College London Coupled Middle Atmosphere-Thermosphere-2 (CMAT2) general circulation model.
Journal ArticleDOI
Modelling F2-layer seasonal trends and day-to-day variability driven by coupling with the lower atmosphere
TL;DR: In this paper, the authors present results from the Time-GCM-CCM3 thermosphere-ionosphere-lower atmosphere flux-coupled model, and investigate how well the model simulates known F2-layer day/night and seasonal behaviour and patterns of day-to-day variability at seven ionosonde stations.
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