GEOSCAN Search Results: Fastlink


TitleCharacterization of high latitude GPS sensed ionospheric irregularities: Case studies
AuthorGhoddousi-Fard, R; Prikryl, P; Oksavik, K; van der Meeren, C; Lahaye, F; Danskin, D
Source 2014 p. 1
LinksOnline - En ligne
LinksPoster - Affiche
Alt SeriesEarth Sciences Sector, Contribution Series 20140356
Meeting11th European Space Weather Week; Liège; BE; November 17-21, 2014
Mediaon-line; digital
File formathtm
Subjectsgeophysics; remote sensing; ionosphere; ionospheric currents; geodesy; geodetic networks
ProgramGeodetic Survey, Canadian Spatial Reference System
AbstractRate of change of 1Hz GPS phase differences at two frequencies are being monitored in near-real-time and used as proxy ionospheric disturbance indices at the Canadian Geodetic Survey (CGS) of Natural Resources Canada from about 165 globally distributed stations including Real-Time International GNSS Service stations as well as other high rate stations operated by CGS. It has been shown that such indices correlate well with the phase scintillation index during weak to moderate phase scintillation over high latitudes. GPS phase rate variations over Canada and adjacent regions have been analyzed during 2013 and early 2014. With more than 40 stations being monitored over the region a significant coverage of ionospheric pierce points during each 24 hours in geomagnetic latitude and local hour is achieved. Maps of occurrence of phase scintillation as a function of local hour and geomagnetic latitude are studied toward characterization of occurrence of irregularities. A number of scintillation events over polar, auroral and sub-auroral latitudes correlated with coronal mass ejections or high-speed solar wind streams have been identified and their analysis is complemented with observations from dedicated scintillation receivers from Canadian High Arctic Ionospheric Network (CHAIN) and a new multi-constellation receiver network in Svalbard.
Summary(Plain Language Summary, not published)
The ionosphere is an atmospheric layer with electrical properties that delays the propagation and reflects radio signals. Irregularities in the ionosphere at high latitudes reduces the power and distorts signals received from navigation and communication satellites. This impacts the quality of GPS positioning and disrupts wireless communication systems. In this study, high-rate GPS phase measurements made from a network of canadiasn tracking stations are used to detect the occurence of localized ionospheric irregularities known as scintillations.