active regions

active regions

Regions of intense localized magnetic field on the Sun that extend from the photosphere, through the chromosphere, to the corona. They may encompass a variety of phenomena, such as sunspots, faculaeplages, filaments (or prominences), and flares, and are characterized by enhanced emission of radiation at X-ray, extreme-ultraviolet, and radio wavelengths.
References in periodicals archive ?
Color images depict active regions related to sunspots, solar flares, a coronal mass ejection, and solar telescope equipment.
The background corona without active regions, the quiet-Sun corona, is less bright but is also believed to be composed of loop-like configurations with both footpoints of field lines anchored in the solar surface.
We recently adjusted mission operations to track a single target for several days, instead of jumping around among active regions, said Savage.
Chile is one of the most seismically active regions on earth and buildings are designed to cope with the regular quakes there.
However flickerings, brightenings, small explosions, bright points, flares and mass eruptions are observed very frequently, especially in active regions.
NASA explained that the active regions that emit more light and energy are the bright spots that are observed in the image.
But Robertson's team found that, although no big, dark blemishes showed up on the star's surface, the H-alpha emission clearly indicates that the star had magnetically active regions at the time.
Scientists track sunspots that are part of active regions, which often produce large explosions on the sun such as solar flares and coronal mass ejections, or CMEs.
The Middle East is one of our most active regions in terms of development, and having properties in almost every capital city in the GCC within the next five years will serve to further consolidate our presence in the market," said president hotel operations Europe, Middle East and Africa, Christopher Norton.
An underground formation in the area known as the Kuril-Kamchatka arc is considered one of the most seismically active regions in the world.
We are one of the most active regions in the UK and have over 500 members," said Jon.
This is one of the most buoyant and active regions in aviation," he said.

Full browser ?