Physics

About Ionosphere Definition Ionosphere is the part of the earth’s atmosphere beginning at an altitude of about 30 miles (50 kilometers) and extending outward that…

About Magnetosphere Definition Magnetosphere is the region surrounding a planet, such as the earth, in which the behaviour of charged particles is controlled by the…

Red dwarf Definition Red dwarf is a small, dim star with relatively cool surface temperatures, positioned to the lower right on the main sequence in…

Radio Wave Definition Radio Wave is a very low frequency electromagnetic wave (from roughly 30 kilohertz to 100 gigahertz). Radio-wave communications signals travel through the…

Magnetic Reconnection Definition Magnetic Reconnection is a fundamental dynamical process (physical process) in highly conductive plasmas. In the process, magnetic field energy is converted to…

Variable Star Definition Variable Star is a star whose actual or observed brightness varies periodically. These changes can occur with varying degrees of regularity and…

Flare Star Definition Flare Star is a variable star that sporadically displays sudden increases in brightness, sometimes becoming six times as bright in a matter…

Geomagnetic Storm Definition Geomagnetic storm is a disturbance in the magnetosphere due to near-Earth space weather that happens when the interplanetary magnetic field turns southward…

Solar Flare Definition Solar Flare occurs when magnetic energy that has built up in the solar atmosphere is suddenly released. On the Sun’s surface are…

Aurora Definition Aurora is a luminous phenomenon that consists of streamers or arches of light appearing in the upper atmosphere of a planet’s magnetic Polar…

Hall Effect Definition Hall Effect is a direct result of Lorentz forces acting on the charges in the current, and is named after U.S. physicist…

Galvanometer Definition Galvanometer is an instrument to detect the presence of current through a circuit. It consists of a permanent magnet and coil. Current passes…