Repository logo

F-region Dusk Ion Temperature Spikes at the Equatorward Edge of the High Latitude Convection Region

dc.contributor.advisorSt.-Maurice, Jean-Pierreen_US
dc.contributor.committeeMemberSofko, Georgeen_US
dc.contributor.committeeMemberKoustov, Sashaen_US
dc.contributor.committeeMemberSmolyakov, Andreien_US
dc.contributor.committeeMemberBugg, Jimen_US
dc.creatorGoodwin, Lindsayen_US 2013en_US
dc.description.abstractBy examining continuous data from the Poker Flat Incoherent Scatter Radar (PFISR) in Poker Flat, Alaska, short-lived enhancements in the F-region ion temperature, or "Tᵢ spikes", were discovered in the evening while the radar was on the equatorward edge of the high latitude convection region. These enhancements were several hundred Kelvin above the background temperature, would last less than 15 minutes and were preceded by sharp depletions in plasma density (of roughly one half). Though they were mostly detected in the summer, 25 events throughout a whole year of data were identi ed in which the spike occurred within 1.5 hours of the density drop. By examining the location of PFISR at the time of the enhancements, as well as the conditions under which these spikes occurred, it was concluded that these enhancements were the result of electric elds increasing the frictional heating between ions and neutrals. By then examining geophysical data, it was found that these events were temporal and related to changes in magnetic indices. One possible explanation for the observations is that the electric eld is at its strongest near the plasmapause during substorms. Another more likely possibility is that during substorms the region of sunward ion convection expands into a region in the evening side where the neutral gas moves in a direction opposite to the ions, thereby enhancing the frictional heating rate.en_US
dc.subjectIon Temperatureen_US
dc.subjectHigh Latitude Convection Regionen_US
dc.subjectPoker Flat Incoherent Scatter Radaren_US
dc.subjectFrictional heatingen_US
dc.subjectElectric Fielden_US
dc.titleF-region Dusk Ion Temperature Spikes at the Equatorward Edge of the High Latitude Convection Regionen_US
dc.type.materialtexten_US and Engineering Physicsen_US of Saskatchewanen_US of Science (M.Sc.)en_US


Original bundle
Now showing 1 - 1 of 1
Thumbnail Image
21.43 MB
Adobe Portable Document Format
License bundle
Now showing 1 - 1 of 1
No Thumbnail Available
1008 B
Plain Text