Geomagnetically induced current (GIC) has been a significant concern for the electrical
power grid in high latitudes for decades. Its origin starts in the Sun; during extreme space …

The lower-thermosphere–ionosphere (LTI) system consists of the upper atmosphere and the
lower part of the ionosphere and as such comprises a complex system coupled to both the …

The context of the term 'geophysics' has changed considerably during the second half of the
past century. Well into the fifties the key interest of non-exploratory non-applied geophysics …

We present a new climatological model of the ionospheric current system, determined from
magnetic measurements taken by the Challenging Minisatellite Payload (CHAMP) and …

Faraday's law of induction is responsible for setting up a geoelectric field due to the
variations in the geomagnetic field caused by ionospheric currents. This drives …

On 25 August 2018 the interplanetary counterpart of the 20 August 2018 coronal mass
ejection (CME) hit Earth, giving rise to a strong G3 geomagnetic storm. We present a …

We quantify the contributions of different convection states to the magnetic flux throughput of
the magnetosphere during 2010. To do this we provide a continuous classification of …

This paper presents a multi-parameter global statistical model of extreme horizontal
geomagnetic field fluctuations (dB H/dt), which are a useful input to models assessing the …

As radio astronomy enters a golden age, ground-based observatories are reaching
sensitivities capable of unlocking a new and exciting field of exoplanet observation. Radio …

We review observations of solar activity, geomagnetic variation, and auroral visibility for the
extreme geomagnetic storm on 1872 February 4. The extreme storm (referred to here as the …