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A faint visual (optical) phenomenon on the Earth associated with geomagnetic activity, which occurs mainly in the high-latitude night sky. Typical auroras are 100 to 250 km above the ground. The Aurora Borealis occurs in the northern hemisphere and the Aurora Australis occurs in the southern hemisphere.

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(Modified Zurich Sunspot Classification). A - A small single unipolar sunspot or very small group of spots without penumbra . B - Bipolar sunspot group with no penumbra. C - An elongated bipolar sunspot group. One sunspot must have penumbra. D - An elongated bipolar sunspot group with penumbra on both ends of the group. E - An elongated bipolar sunspot group with penumbra on both ends. Longitudinal extent of penumbra exceeds 10 deg. but not 15 deg. F - An elongated bipolar sunspot group with penumbra on both ends. Longitudinal extent of penumbra exceeds 15 deg. H - A unipolar sunspot group with penumbra.

A unit of magnetism 10.0E-09 tesla, equivalent to a gamma (10.0E-05 gauss).

A feature of the solar wind having velocities that are about double average solar wind values.

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A sudden eruption of energy on the solar disk lasting minutes to hours, from which radiation and particles are emitted.

The unit of magnetic induction in the cgs (centimeter-gram-second) system.

Of the white light corona (that is, the corona seen by the eye at a total solar (eclipse), that portion which is caused by sunlight scattered or reflected by solid particles (dust) in interplanetary space. The F corona extends from the solar corona from about two or three solar radii far beyond the Earth into space, so that it can actually be seen at night as a faint glow along the ecliptic, the glow is known as zodiacal light.

A transient enhancement of the solar radio emmision , usually associated with an active region or flare .

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