|Title||Extreme values statistical assessment for geomagnetic and geoelectric field variations for Alberta|
|Author||Nikitina, L; Trichtchenko, L|
|Source||Geological Survey of Canada, Open File 7905, 2015, 23 pages, https://doi.org/10.4095/296956 (Open Access)|
|Publisher||Natural Resources Canada|
|NTS||72E; 72L; 72M; 73D; 73E; 73L; 73M; 74D; 74E; 74L; 74M; 82A; 82H; 82I; 82O; 82P; 83; 84|
|Lat/Long WENS||-120.0000 -110.0000 60.0000 49.0000|
|Subjects||geophysics; remote sensing; geomagnetism; geomagnetic fields; geomagnetic variations; geoelectric variations|
|Illustrations||tables; plots; graphs|
|Program||Public Safety Geoscience,
Northern Canada Geohazards Project|
|Released||2015 08 06|
Disturbances of the geomagnetic field produced by space weather events can have an impact on power systems and other critical infrastructure. This study aims to provide an
understanding of possible geomagnetic effects on power systems in Alberta. Extreme value statistics has been applied to 40 years of magnetic data from three Canadian magnetic observatories to estimate maxima of the geomagnetic variations and
horizontal geoelectric fields
- once per 50 years;
- once per 100 years.
This approach to extreme value estimation was tested by using of 16 years of data to estimate 40-years maximum of magnetic variations. Comparison with the actual
maximum for the complete 40-year database showed an error of only 4%.
The estimated values can be used with a power network model to assess geomagnetically induced currents in the Alberta power network.
|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. In this study extreme value statistics is used to provide estimation for extreme geomagnetic activity once per 50 years, once per 100 years. This statistic is based on the long-term recordings of the geomagnetic
activity in Alberta.