Space Weather Monitoring by Ground-Based Means pp 169-185 | Cite as
PC index as an indicator of magnetic storm development
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Abstract
Geomagnetic storms are the result of a joint action of magnetopause currents (DCF), which are proportional to the square root of the solar wind dynamic pressure, and ring currents (DR) flowing in the inner magnetosphere (Chapman, 1963). The DR current ground effect typically far exceeds the DCF current effect, which is why magnetic storm intensity is evaluated by the Dst index depicting a longitudinally averaged magnetic field depression at low latitudes (Sugiura, 1976).
Keywords
Solar Wind Magnetic Storm Geomagnetic Storm Coupling Function Storm Intensity
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