Gamma rays are more energetic, and have shorter wavelengths than all other types of electromagnetic radiation. A worldwide magnetic disturbance. After journeying the length of Siberia, Humboldt convinced the Czar to set up a network of magnetic observatories across the Russian lands, and additional stations were established throughout the British Empire, from Toronto to Tasmania. The change in the magnetic field was small, but its world-wide scale suggested that something quite big was happening out in space. A naturalist who gained attention by exploring the jungles of Venezuela, Humboldt devoted much of his life to the promotion of science.
Infrared wavelengths are longer than visible radiation and shorter than microwave radiation.
A field of magnetic force lines, usually referred to here as the pattern of magnetic force emanating from and surrounding the sun or any of the planets. The resistance of magnetic field to being compressed in space, for instance by the presence of another field. Pressure on a magnetic field crowds field lines together, and the field pushes back with its own pressure. Specifically the outer region of Earth's ionosphere, starting at about 1000 km above Earth's surface and extending to about 60,000 km and to at least 100 Earth radii on the side away from the Sun. A period from 1645 to 1715, when the average number of sunspots was unusually low.