Thanks! I had never heard CME's called a cloud.
Magnetic cloud I would not have reacted to.

CMEs and Space Weather
Most of the energy imparted to the solar wind by a solar event is associated with the ejected plasma and magnetic fields which collectively are called a coronal mass ejection and can take several days to reach Earth.

CMEs cause space weather disturbances, including the largest
geomagnetic storms, in a number of ways.

First, strong southward fields in the CME can reconnect with the predominately northward fields of the sun-facing magnetosphere, producing
strong induced fields and currents in the magnetosphere, the ionosphere, and at the Earth's surface.

The transient solar wind energy is transferred to the magnetosphere through. Thus, strong, sustained southward fields as well as high velocity are important drivers of geoactivity.

These enhanced regions tend to occur both in the compressed plasma between the shock and CME and in the CME itself, which often contains magnetic field structures carried from the sun called magnetic clouds.