Show simple item record

dc.contributor.advisorGustavsson, Björn
dc.contributor.advisorKotov, Dmytro
dc.contributor.authorShulha, Maryna Oleksiivna
dc.date.accessioned2017-05-16T09:24:27Z
dc.date.available2017-05-16T09:24:27Z
dc.date.issued2016-05-15
dc.description.abstractThe aim of this study was to investigate the altitudinal and diurnal variations of light ion densities in the topside ionosphere during the 23rd and 24th solar maximums. This made it possible to understand the behavior of the ion composition after extended solar minimum and compare how it differs from the preceding solar maximum. The observed variations are compared with estimates of empirical (IRI) and physical (SAMI3) models. All necessary data were obtained at Kharkiv Ionospheric Observatory for the summer solstices during the 23rd and 24th solar cycles. The observations showed that there are more helium than hydrogen ions in the daytime during the 23rd solar maximum compared to 24th. The relative concentration of H+ decreases with increasing of solar activity. The O+ have an opposite behavior to H+ and He+ ions: at increasing solar activity, the O+ concentration increases. The dynamic processes have an effect on the variations of light ions in the upper ionosphere. It is found that variations in the mixing ratio of the three main topside ion species above Ukraine differ both qualitatively and quantitatively from the model variations. The experimental relative concentrations of H+ and He+ were much higher than empirical and physical model estimates. There is a somewhat better agreement in the case of O+ densities. The results obtained in this work can be useful in predicting of variations the relative concentration of H+, He+ and O+ in the upper ionosphere over the Central Europe region.en_US
dc.identifier.urihttps://hdl.handle.net/10037/11031
dc.language.isoengen_US
dc.publisherUiT Norges arktiske universiteten_US
dc.publisherUiT The Arctic University of Norwayen_US
dc.rights.accessRightsopenAccessen_US
dc.rights.holderCopyright 2016 The Author(s)
dc.rights.urihttps://creativecommons.org/licenses/by-nc-sa/3.0en_US
dc.rightsAttribution-NonCommercial-ShareAlike 3.0 Unported (CC BY-NC-SA 3.0)en_US
dc.subject.courseIDFYS-3900
dc.subjectVDP::Mathematics and natural science: 400::Physics: 430::Space and plasma physics: 437en_US
dc.subjectVDP::Matematikk og Naturvitenskap: 400::Fysikk: 430::Rom- og plasmafysikk: 437en_US
dc.subjectlight ionsen_US
dc.subjecttopside ionosphereen_US
dc.subjectsolar maximumen_US
dc.subjectIRIen_US
dc.subjectSAMI3en_US
dc.titleInvestigation of the ion composition in the topside ionosphere at solar maximum using incoherent scatter techniqueen_US
dc.typeMaster thesisen_US
dc.typeMastergradsoppgaveen_US


File(s) in this item

Thumbnail
Thumbnail

This item appears in the following collection(s)

Show simple item record

Attribution-NonCommercial-ShareAlike 3.0 Unported (CC BY-NC-SA 3.0)
Except where otherwise noted, this item's license is described as Attribution-NonCommercial-ShareAlike 3.0 Unported (CC BY-NC-SA 3.0)