Penumbra
umbra.
A cooler area on the sun is called a sunspot
A sunspot.
The darkest part, where the magnetic field is approximately vertical to the sun's surface is called the Umbra.
It is called a sunspot.
umbra.
penumbra.
penumbra.
A sun spot
An area on the sun that is cooler is called a sunspot.
A cooler area on the sun is called a sunspot
Sunspot
A sunspot.
The darkest part, where the magnetic field is approximately vertical to the sun's surface is called the Umbra.
It is called a sunspot.
No. A sunspot is a slightly cooler area of the surface associated with magnetic disturbances within the Sun. The eruptions of gas are called prominences, and they are related to the phenomenon called solar flares.
Sunspot maximum and sunspot minimum are the points in time (roughly 6 years apart) when the sun is producing the most, or the least sunspots. In the past this has been measured both by sunspot area and sunspot count and is directly tied to the solar magnetic cycle.