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Midlatitude long-period pulsations and their implications for GIC modelling 

Michael Heyns - University of Cape Town / South African National Space Agency; Stefan Lotz - South African National Space Agency, South Africa; C. T. Gaunt - University of Cape Town, South Africa 

Session: QV - Ground-Level Geomagnetically Induced Currents


Abstract

Geomagnetically induced currents (GICs) are driven by fluctuations of Earth’s geomagnetic field. Drivers of intense GICs are often associated with impulsive events such as coronal mass ejections. Recent studies have shown however that long-period geomagnetic pulsations or Ps6-type disturbances can also drive large GICs at high latitudes. In this work, similar Ps6-type disturbance signatures are seen in measured GIC data from midlatitude sites. There are a couple of implications given pulsation driving in GICs. Firstly, the often used dB/dt proxy does not adequately characterise GIC activity during ULF pulsations with periods significantly different to the sampling rate of the geomagnetic field measurements. Secondly, the quasi-ac nature of the sustained pulsation driving challenges the assumption of damage due to peak GICs alone and affects the power system response in general, which may not be properly modelled using only dc models.



Approaching deadlines:

Registration opens:

16 July 2020

Abstract submission opens:

16 July 2020

European Space Weather Medals:

6 September 2020

Registration deadline:

25 September 2020

Registration deadline: [extended]

10 October 2020

Abstract submission deadline:

4 September 2020