Vortices

rapidly rotating storm system that forms in the tropics

thumb|upright=1.3|An extratropical cyclone near Iceland

Sunspots are temporary spots on the Sun's surface that are darker than the surrounding area. They are regions of reduced surface temperature caused by concentrations of magnetic flux that inhibit convection. Sunspots appear within active regions, usually in pairs of opposite magnetic polarity. Their number varies according to the approximately 11-year solar cycle.

huge, persistent storm in Jupiter's atmosphere

thumb|upright=1.36|The Gulf of Corryvreckan whirlpool in Scotland is the third-largest whirlpool in the world. A whirlpool is a body of rotating water produced by opposing currents or a current running into an obstacle. Miniature whirlpools form when a bath or a sink is draining. More powerful ones formed in seas or oceans may be called maelstroms ( ). Vortex is the proper term for a whirlpool that has a downdraft.

structure formed by diffuse material in orbital motion around a massive central body

thumb|upright=1.3|A waterspout near Thailand in 2016

thumb|Vortex created by the passage of an wing|aircraft wing, revealed by colored smoke thumb|249x249px|Kármán vortex street|Von Kármán vortex street behind a drinking straw; milk was poured into the water to make the current visible thumb|right|250px|A Kármán vortex street is shown in this photo, as winds from the west blow onto clouds that have formed over the mountains in the desert. This phenomenon observed from ground level is extremely rare, as most cloud-related Kármán vortex street activity is viewed from space.

meteorological phenomenon

region of the atmosphere in which atmospheric pressure is lower than that of surrounding regions

persistent cold-core low-pressure area that circles one of the poles

series of large, semi-persistent storms in Neptune's atmosphere

mushroom-shaped cloud produced by a large (often nuclear) explosion

thumb|A whirlwind thumb|A dust devil at school ground thumb|Whirlwind, 61 km northeast of Broome, Western Australia

region of mostly calm weather at the center of strong tropical cyclones

whirlwind induced by a fire and often partially composed of flame or ash

southern cyclonic storm on the planet Neptune

repeating pattern of swirling vortices caused by the unsteady separation of flow of a fluid around blunt bodies

meteorological phenomenon involving two cyclones interacting with each other

swirling of a fluid and the reverse current created when the fluid is in a turbulent flow regime

low-pressure areas that occur over the subtropics

turbulence caused by difference in air pressure on either side of wing

Aerodynamic condition related to helicopter flight

big circular ice floe (ca 1 m ... 50 m diameter) rotating on a river

cyclone aloft which has an associated cold pool of air residing at high altitude within the Earth's troposphere

vortex of supercurrent in a type-II superconductor theoretically predicted by Alexei Abrikosov in 1957

optical phenomenon

thumb|upright=1.14|The effect of downwash from a hovering Sikorsky Seahawk is clearly visible on the surface of water below.

quantized flux circulation of some physical quantity

torus-shaped vortex in a fluid or gas

__NOTOC__ thumb|A landspout tornado in the early stages of development by the town of Lamar, Colorado|alt=Photograph of a landspout under mostly cloudy skies thumb|A landspout tornado forms from a developing thunderstorm near Cheyenne Wells, Colorado. Landspouts are exceptionally common in Eastern Colorado. thumb|Landspout on September 29, 2007, in Minas Gerais

study of the Sun's behavior

theorem

visible vortex ring formed by smoke in a clear atmosphere

class of models about – and observed phenomena of – the dynamics of extinctions of species

toy that fires air vortices at a target

mathematical formula for viscous fluid

former tropical cyclone

system present in the flow of air around a wing

line vortex

Toroidal vortex ring of air in water

lake formed by an underwater vortex when rapid water flow passes an underwater obstacle in boundary areas of high shear