A record of the geomagnetic field on the ground sometimes shows smooth daily variations
on the order of a few tens of nano teslas. These daily variations, commonly known as Sq, are …

Abstract The NASA Ionospheric Connection explorer (ICON) will study the coupling between
the thermosphere and ionosphere at low-and mid-latitudes by measuring the key …

A newly discovered 1000‐km scale longitudinal variation in ionospheric densities is an
unexpected and heretofore unexplained phenomenon. Here we show that ionospheric …

We present space‐and ground‐based multi‐instrument observations demonstrating the
impact of the 2022 Tonga volcanic eruption on dayside equatorial electrodynamics. A strong …

We discuss, in a limited way, some of the challenges to advancing our understanding and
description of the coupled plasma and neutral gas that make up the ionosphere and …

A series of 100‐year extreme geoelectric field and geomagnetically induced current (GIC)
scenarios are explored by taking into account the key geophysical factors associated with …

We have used plasma drift and magnetic field measurements during the 2001–2009
December solstices to study, for the first time, the longitudinal dependence of equatorial …

Magnetic observations on board the CHAMP satellite are used for the first comprehensive
study of magnetic signatures of the postsunset equatorial spread F (ESF) events. This is …

Polarization electric fields created by the E‐and F‐region dynamos cause the uplift of F‐
region plasma. The subsequent redistribution of that plasma along the magnetic field lines …

We report on a series of simulations with the National Center for Atmospheric Research
(NCAR) thermosphere‐ionosphere‐mesosphere‐electrodynamics general circulation model …