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• W2184926912 abstract "High latitude irregularities in electron density havedimensions of meters to kilometers and can cause severescintillation effects for GNSS signals traveling throughthis region of the ionosphere. Extreme scintillationeffects, and associated degradation or loss of navigationcapabilities, have been observed in North America forsevere events. Auroral scintillation has been studied fordecades, with typically strong phase scintillation andweak amplitude scintillation observed at high latitudesdue to the precipitating electrons. Auroral scintillation ismost commonly observed at nightside local times.Since 2003 the University of Calgary has operated anumber of specialized GPS receivers in Canada forionosphere monitoring - as part of the CANGIM(CANadian GPS Network for Ionosphere Monitoring).These receivers are modified dual-frequency survey-gradeNovAtel Euro4 receivers, with specialized firmwarecapable of deriving phase and amplitude scintillationinformation. These data have been collected at three sitesin western Canada over the past five years. These sites arelocated at similar longitudes and over a range of latitudesspanning the sub-auroral region into the polar cap.Observations from the three stations allow latitudeprofiling of the spatial extent of scintillation effects.In this paper, we investigate nightside auroral scintillationusing the extensive CANGIM GPS data set. Scintillationevents throughout the years 2003-2007 are identified. Inorder to better understand the nature of these effects, theCANGIM data are also augmented with observationsfrom spaceborne GPS receivers. GPS observations fromthe CHAMP satellite are used to infer the presence ofionospheric irregularities at various altitudes. For anocculting GPS satellite, the line-of-sight to the low-Earthorbiter (LEO) successively passes though horizontallayers at different altitudes. Times series of suchobservations can therefore reflect the presence of smallscaleelectron density variations in a given height range ifrapid random phase variations are observed. Whenconsidered in conjunction with the ground-basedscintillation measurements in Canada, local LEOobservations are therefore used to determine the verticalextent of irregularities. The nature of physical processesleading to formation of these irregularities (and associatedscintillation effects) is then determined. Results areapplicable to the development of physics-basedscintillation simulations - which are used to assess GNSSreceiver tracking performance." @default.
• W2184926912 created "2016-06-24" @default.
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• W2184926912 date "2008-09-19" @default.
• W2184926912 modified "2023-09-24" @default.
• W2184926912 title "Investigation of Scintillation Characteristics for High Latitude Phenomena" @default.
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