In this study, we present ionospheric observations of field-aligned
currents from AMPERE and the ESA Swarm A satellite, in conjunction with
high-resolution thermospheric density measurements from accelerometers
on board Swarm C and GRACE-FO, for the 3rd and 4th February 2022
geomagnetic storms that led to the loss of 38 Starlink internet
satellites. We study the global storm time response of the thermospheric
density enhancements, including their growth, decay, and latitudinal
distribution. We find that the thermospheric density enhances globally
in response to high-latitude energy input from the magnetosphere-solar
wind system, and takes at least a full day to recover to pre-storm
density levels. We also find that the greatest density perturbations
occur at polar latitudes consistent with the magnetosphere-ionosphere
dayside cusp, and that there appeared to be a saturation of the
thermospheric density during the geomagnetic storm on the 4th. Our
results highlight the critical importance of high-latitude ionospheric
observations when diagnosing potentially hazardous conditions for
low-Earth-orbit satellites.