All electromagnetic waves have two components, the electrical component, called the E-field and the magnetic component, called the H-field. Natural radio receivers are designed to respond to one or the other component. An E-field receiver responds to the electrical component of the wave and usually employs a short whip antenna. An H-field receiver responds to the magnetic component and usually has a loop antenna.
FAQ
What is “Space Weather”?
It has been realized and appreciated only in the last few decades that solar flares, CMEs, and magnetic storms affect people and their activities. The list of consequences grows in proportion to our dependence on technological systems. The subtleties of the interactions between Sun and Earth, and between solar particles and delicate instruments, have become factors that affect our well being. Thus there will be continued and intensified need for space environment services to address health, safety, and commercial needs.
What is a “Geomagnetic Storm”?
A geomagnetic storm is a worldwide disturbance of the earth’s magnetic field, distinct from regular day/night variations.