| Title | High-latitude GPS phase scintillation and cycle slips during high-speed solar wind streams and interplanetary coronal mass ejections: a superposed epoch analysis |
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| Author | Prikryl, P; Jayachandran, P T; Mushini, S C; Richardson, I G |
| Source | Earth, Planets and Space vol. 66, 2014 p. 1-10, https://doi.org/10.1186/1880-5981-66-62  Open Access |
| Image |  |
| Year | 2014 |
| Alt Series | Earth Sciences Sector, Contribution Series 20130496 |
| Publisher | Springer Nature |
| Document | serial |
| Lang. | English |
| Media | paper; on-line; digital |
| File format | pdf |
| Subjects | geophysics; extraterrestrial geology; Health and Safety; geomagnetism; geomagnetic fields; geomagnetic variations; magnetic interpretations; magnetic disturbances; magnetic field; solar variations;
ionosphere; magnetosphere; Canadian High Arctic Ionospheric Network (CHAIN); Infrastructures; monitoring |
| Illustrations | sketch maps; plots; time series |
| Program | Public Safety Geoscience Northern Canada Geohazards Project |
| Released | 2014 06 30 |
| Abstract | Results of a superposed epoch (SPE) analysis of occurrence of phase scintillation and cycle slips at high latitudes keyed by arrival times of high speed solar wind streams (HSS) and interplanetary
coronal mass ejections (ICME) for years 2008-2012 are presented. Phase scintillation index cotangent is obtained in real time from L1 signal recorded at the rate of 50 Hz by specialized GPS Ionospheric Scintillation and TEC Monitors (GISTMs) deployed
as a part of the Canadian High Arctic Ionospheric Network (CHAIN). The phase scintillation, mapped as a function of magnetic latitude and magnetic local time, occurs predominantly on the dayside in the cusp and in the nightside auroral oval. The
scintillation occurrence peaks on days of HSS or ICME impacts at the Earth¿s magnetosphere, and tapers off a few days later, which is similar to day-to-day variability of geomagnetic activity and riometer absorption at high latitudes. ICMEs that are
identified as magnetic clouds are significantly more geoeffective, particularly in triggering auroral substorm activity, than HSSs and ICMEs with no or weak magnetic cloud characteristics. Magnetic clouds result in higher occurrence, and thus
probability, of scintillation in the nightside auroral zone on their arrival day. The SPE analysis results are used to obtain cumulative probability distribution functions for the phase scintillation occurrence that can be employed in probabilistic
forecast of phase scintillation at high latitudes (Prikryl et al., 2012). |
| Summary | (Plain Language Summary, not published)
Space weather refers to the dynamic conditions on the Sun and in the space environment, in particular, in the near-Earth environment, that can affect
critical infrastructure. NRCan operates the Canadian Space Weather Forecast Centre and conducts research into space weather effects on power systems, pipelines, radio communications and GNSS positioning to help Canadian industry understand and
mitigate the effects of space weather. This paper examines statistical occurrence of GNSS scintillation at high latitudes. The scintillation is closely linked to arrival time of solar wind disturbances. A method of probabilistic forecasting of
scintillation occurrence is proposed. This provides information to guide the design of space weather hazard forecasting. |
| GEOSCAN ID | 293751 |
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