What does AR stand for?

Active Region (sunspot observation)

This definition appears very rarely and is found in the following Acronym Finder categories:

Science, medicine, engineering, etc.

Other Resources:

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Acquiescence Ruling Acquisition Reform Acquisition Request Acquisition Risk Acrobat Reader (Adobe Systems) Action Replay (game console cheat device) Action Report Action Required Action Research Active Radar		Activity Ratio Activity Reports Activity Resume (ITU-T) Acute Rejection Adaptive Reception Control Add Register Address Register Administrative Record Administrative Regulation (various organizations) Administrative Requirement

Samples in periodicals archive:

Because the Tibetan Plateau is one of the most seismically active regions in the world, we believe there is credible evidence for a new major quake in this region," said Lin, a geophysicist at WHOI.

Temblor in China raises risk of more big quakes nearby

Your hands, feet and the groin area are some of the most active regions of perspiration since they?

How to Stop Sweating Hyperhidrosis

Charges are delivered to the transistor's quantum well active region, where they either recombine almost instantly, or they are kept moving on out of the device.

Scientists break light modulation speed record

Kyrgyzstan, a landlocked and mountainous nation of five million people, is one of the poorest states of the former Soviet Union and lies in a seismically active region.

60 killed in Kyrgyzstan quake: minister

Researchers have now deciphered the enzyme's active region and worked out the most important part of its structure.

Drugs hopes; in association with NHS

Top left: A combination of white-light, ultraviolet, and extreme ultraviolet images showing two large, intense solar flares (green) as they arch above the solar surface (red) Top right: An active region of the sun on a quiet day: gas at a million degrees Kelvin is being ejected from the solar surface where the dark structures are only about 10,000 degrees.

Talking pictures: know your energy source

Wide-bandgap topics include optoelectronics and electronic materials (including fabrication and characterization of ultraviolet light emitting devices with nanometer scale compositionally inhomogeneous active regions and time-resolved photoluminescence of wideband gap semiconductor devices), and materials, devices and sensors.

State-of-the-art program on compound semiconductor 47 (SOTAPOCS 47) ...

California is one of the worlds most seismically active regions.

Los Angeles skyscrapers shaken by earthquake