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| INSTITUTET FÖR RYMDFYSIK | UPPSALA |
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|
| Swedish Institute of Space Physics | (59°50.272′N, 17°38.786′E) |
Master Project (30 c)/Masterprojekt (30 hp)
Plasma density variations and field-aligned currents in the ionosphere over Sweden and their effects on radio scintillations and delays
Student: Tim Abrahamsson, Uppsala UniversitySupervisor: Stephan Buchert
Abstract
The effectiveness of the ever increasing use of GNSS is hindered by the ionosphere in two ways, delay and scintillations. Using Lantmäteriet’s Ionosphere monitor, the average uncertainty in different regions was plotted. These measurements were then compared to the changes in the ionospheric electron density as measured by ESA's Swarm satellites. In addition to this the uncertainty measurements were also compared to solar activity using the F10.7 solar index. It was found that the uncertainties in the southern regions, that being Svealand and Götaland, correlated to the plasma density which sees a peak around noon local time while the northern regions, that being northern and southern Norrland, correlated strongly to the standard deviation of the plasma density which sees a peak at around midnight. It was also found that the uncertainties in all regions correlated to the 11-year solar cycle.Results
Final report
![[Plot]](tim.png)
Example plot from the report, showing solar activity as quantified by the F10.7 index and the uncertainty in position data in one of the four regions investigated.