Bell bottoms are trousers that become more wide from the knees downwards.
It is believed that bell-bottom pants were introduced in 1817 to sailors working on deck. The flare at the end of the pant leg allowed them to be rolled up more easily than normal straight-legged pants. The bell-shaped leg also made the pants easier to remove in a hurry when forced to abandon ship or when washed overboard. The pants may also be knotted at the legs to be used as a life preserver. Absurdly wide hems became fashionable in the 1960s, both for men and women.
If a person looks at a pair of bell-bottoms from front or behind, it has the form of a bell or trumpet. Bell-bottoms are sometimes worn by carpenters in order to prevent dust from getting into their shoes. In the modern fashion scene, bell-bottoms were most popular in the 1960s and 70s. They become popular again in 1990s in a reincarnation known as "flares", worn mostly by women.
Solar flares are often observed using filters to isolate the light emitted by hydrogen atoms in the red region of the solar spectrum (the H-alpha spectral line).
This is an example of a "two-ribbon" flare in which the flaring region appear as two bright lines threading through the area between sunspots within a sunspot group.
The flare (the bright area) lies along a section of a neutral line where the magnetic field is twisted (or sheared) to point along the neutral line instead of across it.
Flares are used for signaling, illumination, or defensive countermeasures in civilian and military applications.
Flares generally produce their light through the combustion of magnesium metal, sometimes colored by the inclusion of other metals.
In the civilian world, flares are commonly used as distress signals, and may be ignited on the ground or fired as an aerial signal from a pistol-like flare gun.
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