Regional estimation of geomagnetically induced currents based on the local magnetic or electric field
Previous studies have demonstrated a close relationship between the time derivative of the horizontal geomagnetic field vector (dH/dt) and geomagnetically induced currents (GIC) at a nearby location in a power grid. Similarly, a high correlation exists between GIC and the local horizontal geoelectri...
| Main Authors: | , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
EDP Sciences
2015-01-01
|
| Series: | Journal of Space Weather and Space Climate |
| Subjects: | |
| Online Access: | http://dx.doi.org/10.1051/swsc/2015022 |
| _version_ | 1818447288205312000 |
|---|---|
| author | Viljanen Ari Wintoft Peter Wik Magnus |
| author_facet | Viljanen Ari Wintoft Peter Wik Magnus |
| author_sort | Viljanen Ari |
| collection | DOAJ |
| description | Previous studies have demonstrated a close relationship between the time derivative of the horizontal geomagnetic field vector (dH/dt) and geomagnetically induced currents (GIC) at a nearby location in a power grid. Similarly, a high correlation exists between GIC and the local horizontal geoelectric field (E), typically modelled from a measured magnetic field.
Considering GIC forecasting, it is not feasible to assume that detailed prediction of time series will be possible. Instead, other measures summarising the activity level over a given period are preferable. In this paper, we consider the 30-min maximum of dH/dt or E as a local activity indicator (|dH/dt|30 or |E|30). Concerning GIC, we use the sum of currents through the neutral leads at substations and apply its 30-min maximum as a regional activity measure (GIC30).
We show that |dH/dt|30 at a single point yields a proxy for GIC activity in a larger region. A practical consequence is that if |dH/dt|30 can be predicted at some point then it is also possible to assess the expected GIC level in the surrounding area. As is also demonstrated, |E|30 and GIC30 depend linearly on |dH/dt|30, so there is no saturation with increasing geomagnetic activity contrary to often used activity indices. |
| first_indexed | 2024-12-14T20:01:14Z |
| format | Article |
| id | doaj.art-073fdd8b8728431db3111ad7399c0d06 |
| institution | Directory Open Access Journal |
| issn | 2115-7251 |
| language | English |
| last_indexed | 2024-12-14T20:01:14Z |
| publishDate | 2015-01-01 |
| publisher | EDP Sciences |
| record_format | Article |
| series | Journal of Space Weather and Space Climate |
| spelling | doaj.art-073fdd8b8728431db3111ad7399c0d062022-12-21T22:49:09ZengEDP SciencesJournal of Space Weather and Space Climate2115-72512015-01-015A2410.1051/swsc/2015022swsc150029Regional estimation of geomagnetically induced currents based on the local magnetic or electric fieldViljanen AriWintoft PeterWik MagnusPrevious studies have demonstrated a close relationship between the time derivative of the horizontal geomagnetic field vector (dH/dt) and geomagnetically induced currents (GIC) at a nearby location in a power grid. Similarly, a high correlation exists between GIC and the local horizontal geoelectric field (E), typically modelled from a measured magnetic field. Considering GIC forecasting, it is not feasible to assume that detailed prediction of time series will be possible. Instead, other measures summarising the activity level over a given period are preferable. In this paper, we consider the 30-min maximum of dH/dt or E as a local activity indicator (|dH/dt|30 or |E|30). Concerning GIC, we use the sum of currents through the neutral leads at substations and apply its 30-min maximum as a regional activity measure (GIC30). We show that |dH/dt|30 at a single point yields a proxy for GIC activity in a larger region. A practical consequence is that if |dH/dt|30 can be predicted at some point then it is also possible to assess the expected GIC level in the surrounding area. As is also demonstrated, |E|30 and GIC30 depend linearly on |dH/dt|30, so there is no saturation with increasing geomagnetic activity contrary to often used activity indices.http://dx.doi.org/10.1051/swsc/2015022Geomagnetically induced currents |
| spellingShingle | Viljanen Ari Wintoft Peter Wik Magnus Regional estimation of geomagnetically induced currents based on the local magnetic or electric field Journal of Space Weather and Space Climate Geomagnetically induced currents |
| title | Regional estimation of geomagnetically induced currents based on the local magnetic or electric field |
| title_full | Regional estimation of geomagnetically induced currents based on the local magnetic or electric field |
| title_fullStr | Regional estimation of geomagnetically induced currents based on the local magnetic or electric field |
| title_full_unstemmed | Regional estimation of geomagnetically induced currents based on the local magnetic or electric field |
| title_short | Regional estimation of geomagnetically induced currents based on the local magnetic or electric field |
| title_sort | regional estimation of geomagnetically induced currents based on the local magnetic or electric field |
| topic | Geomagnetically induced currents |
| url | http://dx.doi.org/10.1051/swsc/2015022 |
| work_keys_str_mv | AT viljanenari regionalestimationofgeomagneticallyinducedcurrentsbasedonthelocalmagneticorelectricfield AT wintoftpeter regionalestimationofgeomagneticallyinducedcurrentsbasedonthelocalmagneticorelectricfield AT wikmagnus regionalestimationofgeomagneticallyinducedcurrentsbasedonthelocalmagneticorelectricfield |