A region of intense magnetic fields on the visible surface of the Sun, usually related to a group of sunspots. Active regions are often source points for ejection of material from the overlying solar corona (as CMEs) into interplanetary space. The magnetic complexity of active regions determines the likelihood of flares and CMEs. Back to the top.
The region of BJT operation between saturation and cutoff used for linear amplification.
Part of the solar atmosphere that is associated with a magnetic field where solar events often take place.
A temporary area of the solar atmosphere in which plages, sunspots, faculae, flares, and other features of the sun can be observed. ( go to first use in the text)
Regions on the Sun, and presumably other stars, that are the centers of intense magnetic fields, plages, sunspots, flares, prominences, etc.
A region on the sun which is bright in X-rays and which is very dynamic in nature. Usually an active region incorporates sunspots, plage (bright areas in the chromosphere overlying sunspots), filaments (cool, relatively dense regions of the corona that appear dark against the background of the chromosphere) and hot, x-ray emitting loops. Active regions contain strong magnetic fields. Flares occur within active regions.
an area on the Sun with a lot of magnetic field in the form of sunspots , pores , and plage
An area of the Sun where the magnetic fields are very strong. At ultraviolet and X-ray wavelengths they appear bright. In visible light they exhibit sunspots. more
Areas on the Sun where magnetic fields are concentrated; sunspots, prominences, and flares all tend to occur in active regions.
A region that is sensitive to specified mouse events. When a mouse event occurs within the active region, a specified method is invoked.
Region of the photosphere of the Sun surrounding a sunspot group, which can erupt violently and unpredictably. During sunspot maximum, the number of active regions is also a maximum.
A localized, transient volume of the solar atmosphere in which plages, sunspots, faculae, flares, etc. may be observed.
An area of the solar atmosphere where the sun’s magnetic field is both concentrated and contorted. The contortion of the magnetic field results in the formation of dark areas such as sunspots and bright areas known as faculae . These regions also produce flares and plages . (TOP OF THE PAGE) (CLOSE WINDOW)
An area of the solar atmosphere where the Sun’s magnetic field is concentrated. The concentration and bipolar nature of the magnetic field results in the formation of dark areas such as sunspots and bright areas known as faculae. These regions also produce flares and plages. aurora: Light radiated by ions and atoms in the Earth’s upper atmosphere, mostly in polar regions, the result of bombardment by energetic electrically charged particles from the ionosphere and magnetosphere.
The BJT operating region between saturation (maximum I and cutoff (minimum I).