corona

(redirected from Coronal Holes)
Also found in: Dictionary, Thesaurus, Encyclopedia.

corona

 [kŏ-ro´nah] (pl. coro´nae, coronas) (L.)
crown; in anatomic nomenclature, an eminence or encircling structure that resembles a crown. adj., adj cor´onal.
corona radia´ta
1. the radiating crown of projection fibers passing from the internal capsule to every part of the cerebral cortex.
2. an investing layer of radially elongated follicle cells surrounding the zona pellucida of the ovum; it accompanies the oocyte during ovulation.

crown

(krown), [TA]
1. Any structure, normal or pathologic, resembling or suggesting a crown or a wreath.
2. In dentistry, that part of a tooth that is covered with enamel. Synonym(s): corona [TA]
3. An artificial substitute for the part of a tooth that is normally covered with enamel.
[L. corona]

corona

(kə-rō′nə)
n. pl. coro·nas or coro·nae (-nē)
1. Astronomy
a. A faintly colored luminous ring or halo appearing to surround a celestial body when viewed through a haze or thin cloud, especially such a ring around the moon or sun, caused by scattering or diffraction of light from suspended particulate matter in the intervening medium. Also called aureole.
b. The luminous irregular envelope of extremely hot and highly ionized gas located outside the chromosphere of the sun.
2. Architecture An overhanging part near the top of a classical cornice, having a flat outer face.
3. A cigar with a long tapering body and blunt ends.
4. Anatomy The crownlike upper portion of a bodily part or structure, such as the top of the head.
5. Botany A crown-shaped, funnel-shaped, or trumpet-shaped outgrowth or appendage of the perianth of certain flowers, such as a daffodil. Also called crown.
6. Electricity A faint glow enveloping the high-field electrode in a corona discharge, often accompanied by streamers directed toward the low-field electrode.

corona of penis

A ridge of skin separating the penis head from the shaft, which corresponds to the “trailing” edge of the head.

crown

(krown)
1. Any structure, normal or pathologic, resembling or suggesting a crown or a wreath.
2. dentistry That part of a tooth that is covered with enamel, or an artificial substitute for that part.
Synonym(s): corona [TA] .
[L. corona]

corona

Any structure resembling a crown.

corona

a trumpet-shaped outgrowth of the PERIANTH, as in daffodil flowers.

crown

(krown)
1. [TA] In dentistry, that part of a tooth that is covered with enamel.
2. An artificial substitute for the part of a tooth that is normally covered with enamel.
[L. corona]
References in periodicals archive ?
This is consistent with the fast wind originating from cooler coronal holes, and the plasma streaming straight out without time for FIP fractionation.
Falconer, "Magnetic untwisting in solar jets that go into the outer corona in polar coronal holes," Astrophysical Journal, vol.
This results in the fast solar winds (see [section]5.8) and coronal holes (see [section]4.6 [52]) in this region.
During solar max, the magnetic fields on the sun reverse and new coronal holes appear near the poles with the opposite magnetic alignment.
(2008) Weaker solar wind from the polar coronal holes and the whole Sun.
Hahn's team also calculated that the energy dissipated could provide up to 70% of that needed to heat the polar coronal hole and accelerate the fast solar wind.
Because the team has determined the geometry of the coronal holes, researchers can predict the speed of the solar wind.
The quiet sun and coronal holes are punctuated by small X-ray bright points, which are always associated with simple magnetic bipoles in the photosphere and dark ephemeral regions in the chromosphere.
The coronal hole leaves an open channel out of which the solar winds blast out.
There are magnetic regions appearing; there are coronal holes, fast and slow streams, and time variations in the solar wind.
The cells looked somewhat like a cell pattern that occurs on the sun's surface - similar to the bubbles that rise to the top of boiling water - but it was a surprise to find this pattern higher up in the corona, which is normally dominated by bright loops and dark coronal holes.
The holes, called coronal holes, are gateways for solar material and gas to spill out into space, according to space.com.