The four types are i the measured minute interval hmF2 hmF2 15 , ii the calculated minute interval hmF2 hmF2 30 , iii the calculated minute interval hmF2 hmF2 60 , and iv the direct 1-hour interval hmF2 hmF2 1HR obtained directly at every one hour interval. This is revealed in Fig. African equatorial region, Digital portable sounder, Vertical plasma drift, Pre-noon, hmF2, F2-layer. The original work which has been published in Adebesin et al. Author information Article notes Copyright and License information Disclaimer.
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Associated Data Supplementary Materials Supplementary material. The various statistical instruments used in Table 2 are defined in Eqs.
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At HMF2 we call upon our 25 years of experience in the shipping industry to provide training and expert guidance in the compliance of regulatory matters for transporting dangerous goods and hazardous materials. A sample plot of Vz was then employed for each type of hmF2 interval data using its time rate of change. Hmf The Authors would like to appreciate the entire Staff of the Department of Physics, University of Ilorin, Nigeria, for the use of the data obtained from their Equatorial Ionospheric Observatory, where the Digital Portable Sounder was erected.
Observation is for over Ilorin ionosphere at Data is for Ilorin Geographic latitude 8. The remaining three datasets were thereafter subjected to statistical analysis. This is revealed in Fig. Other ionospheric parameters that can be obtained from the digisonde are displayed on the Left Hand Side with corresponding values.
LT is the local time, and it is measured in hour. Journal Hjf2 Data Brief v. We offer an annual update for our in-house training programs as well. Both the hmF2 30 are hmF2 60 had the advantage that all the data were used during the computation process Table 1. This conditions now led us to the use of the hmF2 60 as our hmF2 data in the computation of the drift velocity.
The original work which has been published in Adebesin et al. Equatorial vertical plasma drift velocities and electron densities inferred from ground-based ionosonde measurements during low solar activity. Reading from the relative standard deviation and the relative standard error values for the hmF2 30hmF2 60and hmF2 1HRhmF2 60 was observed to be more reliable in the computation of Vz owning to its lowest relative standard error values in most of the months.
Open in a separate window. Vertical electron density profiles from the Digisonde ionograms: Subsequently, four different types of window interval of hmF2 were tested, and the best of it was selected for the computation of Vz.
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The Authors would like to appreciate the entire Staff of the Department of Physics, University of Ilorin, Nigeria, for the use of the data obtained from their Equatorial Ionospheric Observatory, where the Digital Portable Sounder was erected. The raw data is an ionogram e. Footnotes Transparency document Transparency data associated with this article can be found in the online version at doi: This are the measured minute, the calculated minute, the calculated minute, and the directly selected 1-hour interval datasets.
Articles from Data in Brief are provided here courtesy of Elsevier.
Data accessibility The processed monthly hourly averaged data are available within this paper. The four types are i the measured minute interval hmF2 hmF2 15ii the calculated minute interval hmF2 hmF2 30iii the calculated minute interval hmF2 hmF2 60and iv the direct 1-hour interval hmF2 hmF2 1HR obtained directly at every one hour interval. Transparency document Transparency data associated with this article can be found in the online version at doi: In addition to normal policies and procedures, we can develop emergency response programs for both your facility s and incidents that may occur during transportation.
Obviously, drift velocity inferred from hmF2 15 data do not meet with up with the three features that characterizes Vz pattern.
Highlighted in Table 2 are the hmF2 monthly mean statistical data for the three remaining data-set intervals. We are then left with hmF2 30 hm2f, hmF2 60and hmF2 1HR to pick from, as the best interval data in the computation of drift velocity. These are i the evening time pre-reversal enhancement - PRE, often around The most statistically reliable for each month is tagged by a.