<P> Bright points are small active regions found on the solar disk . X-ray bright points were first detected on April 8, 1969 during a rocket flight . </P> <P> The fraction of the solar surface covered by bright points varies with the solar cycle . They are associated with small bipolar regions of the magnetic field . Their average temperature ranges from 1.1 x10 K to 3.4 x10 K . The variations in temperature are often correlated with changes in the X-ray emission . </P> <P> Coronal holes are the Polar Regions which look dark in the X-rays since they do not emit much radiation . These are wide zones of the Sun where the magnetic field is unipolar and opens towards the interplanetary space . The high speed solar wind arises mainly from these regions . </P> <P> In the UV images of the coronal holes, some small structures, similar to elongated bubbles, are often seen as they were suspended in the solar wind . These are the coronal plumes . More exactly, they are long thin streamers that project outward from the Sun's north and south poles . </P>

The sun's corona produces primarily which type of light