Aurora

An aurora, sometimes referred to as a polar light, is a natural light display in the sky, predominantly seen in the high latitude (Arctic and Antarctic) regions. Auroras are produced when the magnetosphere is sufficiently disturbed by the solar wind that the trajectories of charged particles in both solar wind and magnetospheric plasma, mainly in the form of electrons and protons, precipitate them into the upper atmosphere (thermosphere/exosphere), where their energy is lost. The resulting ionization and excitation of atmospheric constituents emits light of varying colour and complexity. The form of the aurora, occurring within bands around both polar regions, is also dependent on the amount of acceleration imparted to the precipitating particles. Precipitating protons generally produce optical emissions as incident hydrogen atoms after gaining electrons from the atmosphere. Proton auroras are usually observed at lower latitudes. Different aspects of an aurora are elaborated in various sections below.

Polar

Polar may refer to:

Geography

Pertaining to the geographical pole, either of two fixed points on the surface of a spinning body or planet, at 90 degrees from the equator, based on the axis around which a body spins

Pertaining to the Polar region, region within the polar circles, referred to as the Arctic and Antarctic

Polar climate, the climate common in polar regions

Places

Polar, Wisconsin, town in Langlade County, Wisconsin, United States

Polar (community), Wisconsin, unincorporated community in Langlade County, Wisconsin, United States

Polar (community), Wisconsin, unincorporated community in Langlade County, Wisconsin, United States

People

Polar (artist), Norwegian electronic music artist

Mathematics

Pole and polar (a point and a line), a construction in geometry

Polar cone
Polar coordinate system, uses a central point and angles
Polar curve (a point and a curve), a generalization of a point and a line
Polar set, with respect to a bilinear pairing of vector spaces

Polar cone

Polar coordinate system, uses a central point and angles

Light (disambiguation)

Light is an electromagnetic radiation, part of which stimulates the sense of vision.

Light may also refer to:

Devices producing light

Electric light

Traffic light

In religion

Divine light, an aspect of divine presence or illumination

Light of the World, in Christianity, light is a commonly used metaphor for Christ

People

Light (surname)

Places

Electoral district of Light, a state electoral district in South Australia

Light, Arkansas, an unincorporated community

Light River (New Zealand)

Light River (South Australia)

Food or beverages

Light or lite, a low-alcohol beer

Light, a category of 19th-century Scottish beer that would be a mid-range beer today

Lights (offal), the lungs of an animal used in cooking

In music

Light Records, a record label

Lights (musician) (born 1987), Canadian singer-songwriter

Lights (EP), a 2008 EP by Lights

Lights (EP), a 2008 EP by Lights

Albums

Light (Jeff Deyo album), 2003

Light (Matisyahu album), 2009

Lights (Archive album), 2006

Lights (Brigade album), 2006

National Geographic

National Geographic or NatGeo may refer to:

National Geographic (magazine), the official journal of the National Geographic Society

National Geographic Channel, a subscription television channel that airs non-fiction television programs produced by the National Geographic Society

National Geographic Society, an American non-profit scientific and educational institution

Northern Lights

Northern lights is a common name for the Aurora Borealis (Polar Aurorae) in the Northern Hemisphere.

Northern Lights or Northern Light may also refer to:

Books

Northern Lights, a 1975 novel by American author Tim O'Brien

The Northern Lights, a 1991 novel by Howard Norman

Northern Lights (novel), a 1995 novel by Philip Pullman

Northern Lights, 2001, English translation of Severni sij, a 1984 Slovene novel by Drago Jančar

The Northern Lights, 2002, a biography of Norwegian scientist Kristian Birkeland, by Lucy Jago

A Northern Light, a 2003 historical novel by Jennifer Donnelly

Northern Lights, a 2009 romance novel by Nora Roberts

Films

Northern Lights (1978 film), a 1979 movie directed by John Hanson and Rob Nilsson

Northern Lights (1997 film), a 1997 movie starring Diane Keaton

Northern Light (film), a 2006 Dutch film

The Golden Compass (film), a 2007 film adaption of the 1995 Philip Pullman novel

Northern Lights (2009 film), a made-for-television film based on the 2009 novel by Nora Roberts

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Relax Music & Stunning Aurora Borealis - Northern ...

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photo: AP Photo/Xinhua, Wang Jianmin

Russian Marine Corps line up for briefing on the beach in Qingdao, in east China´s Shangdong Province, Monday, Aug. 22, 2005 during "Peace Mission 2005" Sino-Russian joint military exercise. A 9,000-strong force of Chinese and Russian tro

China violates border again, this time in Uttarakhand's Barahoti - India

Edit The Times of India 31 Jul 2017

NEW DELHI. Two days before National Security Advisor Ajit Doval visited Beijing, Chinese soldiers transgressed into Uttarakhand's Barahoti and came into as much as one kilometre of Indian territory, reported Times Now on Monday. This is the second transgression, coming a little over a month after the June 16 incursion by Chinese troops in Doklam in the Sikkim sector of the India-China border ... You might also like. RELATED ... Find . ... YAHOO!....

photo: UN / Rick Bajornas

Nikki Haley, United States Permanent Representative to the UN and President of the Security Council for April, chairs the Council’s meeting on the situation in Syria

US says time for talk on North Korea 'is over'

Edit The Times of India 31 Jul 2017

WASHINGTON. The US has said the time for talk over North Korea was "over," spurning a UN response to Pyongyang's latest ICBM launch in favour of bomber flights and missile defence system tests ... US strategic bombers on Saturday flew over the Korean peninsula in a direct response to the launch, and on Sunday American forces successfully tested a missile interception system the US hopes will be installed on the Korean peninsula ... RELATED....

photo: AP / Alex Brandon

In this Friday, April 7, 2017 file photo, President Donald Trump and Chinese President Xi Jinping pause for photographs at Mar-a-Lago in Palm Beach, Fla. when Trump was meeting again with Xi with U.S. missile strikes on Syria adding weight to his threat to act unilaterally against the nuclear weapons program of China's ally, North Korea.

China Fires Back at Trump Criticism Over North Korea Missile Test

Edit WorldNews.com 31 Jul 2017

China did not take the claim from U.S. President Donald Trump that he was "very disappointed" in Beijing after Pyongyang's latest missile tests lightly, saying that the problem of North Korea did not begin in China and that a solution needs to be reached by all parties involved, according to Reuters ... Japanese Prime Minister Shinzo Abe spoke with Trump on Monday about the need for more action against North Korea, just hours after U.S ... ... ....

photo: AP / Alexander Zemlianichenko, POOL

Russian President Vladimir Putin chats with Defence Minister Sergei Shoigu as they attend the military parade during the Navy Day celebration in St.Petersburg, Russia, on Sunday, July 30, 2017.

Russia Working Behind-The-Scenes To Remake Afghanistan Image, Report Says

Edit WorldNews.com 31 Jul 2017

Newsweek is reporting Russia is working behind-the-scenes to remake its image by exploiting Afghani disappointment with discouraging results of the post-9/11 intervention by the U.S. and its allies.Russians are ramping up political, economic and propaganda activities to improve their image and reestablish influence amid growing corruption impeding progress in Afghanistan, the report said ... With U.S....

photo: AP / Cliff Owen

Sen. John McCain, R-Az., front left, is pursued by reporters after casting a 'no' vote on a a measure to repeal parts of former President Barack Obama's health care law, on Capitol Hill in Washington, Friday, July 28, 2017.

Sen. John McCain’s Heroism Isn’t Nearly Like That of Millions of Caregivers in America or Vietnam

Edit WorldNews.com 31 Jul 2017

Article by WN.com Correspondent Dallas Darling ... Another thing that’s real is the lasting effects of genocidal wars, like Vietnam, which leave behind birth defects and cancerous tumors, physical deformities and genetic mutations, unexploded ordinances and orphans, and millions of caregivers ... John McCain’s wartime heroism is obviously much different ... Another difference is the U.S ... soldiers randomly shot the elderly and children ... 16. ....

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Man apparently climbs barrier to get selfie with polar bear at Buffalo Zoo

Edit Syracuse 31 Jul 2017

An apparent quest for a selfie with a 1,000-pound polar bear at the Buffalo Zoo ended with the arrest of a Lackawanna man Friday ... Taher, 35, of Elkhart Street with criminal trespass after he allegedly climbed over a barrier into a restricted area of the polar bear exhibit and approached a bear that was behind a wire-mesh fence ... Lackawanna man arrested after seeking close encounter with polar bear at Buffalo Zoo....

Australian Polar Bear cub explores new enclosure

Edit Reuters 31 Jul 2017

Sea World Australia's three-month-old polar bear cub starts a new stage in her development with her keepers introducing her to an enclosure specially designed for her. No reporter narration ... ....

Polar Bear Cub Is Killing The Internet With Cuteness

Edit CBS Sports 31 Jul 2017

QUEENSLAND (CBSMiami) – Social media is falling in love with a three-month-old polar bear at Sea World Australia who started a new a new ......

Magnon circular birefringence: Polarization rotation of spin waves and its applications

Edit Science Daily 31 Jul 2017

An international team of researchers has conducted a thorough study of an exotic behavior of material called 'noncentrosymmetric antiferromagnet.'  ... ....

A Georgia Republican says it’s time to rethink redistricting

Edit Atlanta Journal 31 Jul 2017

State Rep. Allen Peake, R – Macon. BOB ANDRES / BANDRES@AJC.COM. State Rep ... The main question ... We would have this instant polarization go away and we’d look at each other differently, work across party lines more.” ... “At the federal level, there’s a greater need to look at the redistricting so the districts aren’t so polarized ... But it’s clear that’s what has caused the polarization.” ....

Icebreaker sets mark for earliest Northwest Passage transit

Edit The Recorder 31 Jul 2017

St-Laurent left St ... Radar indicated the presence of the U.S ... For the most part, the ship’s only companions were Arctic sea birds, seals and the occasional whale, until two-thirds of the way through the voyage, as Nordica was plowing through sea ice in Victoria Strait, a crew member sighted a polar bear ... The expedition never made it ... Their two ships were found in 2014 and 2016, not far from where Nordica sighted its first polar bear ... ....

Bisciotti says Ravens keeping 'door open' on signing Colin Kaepernick

Edit Baltimore Sun 31 Jul 2017

The Ravens’ top executives have spoken to current and former players, including Ray Lewis, and both fans and sponsors as they continue to mull whether to sign polarizing free-agent quarterback Colin Kaepernick. Speaking alongside NFL commissioner Roger Goodell at a fan forum before the Ravens’... ....

Bisciotti says Ravens keeping ‘door open’ on signing Colin Kaepernick

Edit Lancaster Online 31 Jul 2017

Group says long-awaited high Arctic research station is nearly complete

Edit Topix 31 Jul 2017

A decade after it was first promised, Canada's new High Arctic Research Station is nearly complete and already giving scientists access to a vast new section of ice and tundra. "We're trying to come up with a long-term, systematic, multi-disciplinary view of this part of the world, which is really understudied," said David Scott, president of Polar Knowledge Canada, which operates the new station in Cambridge Bay, Nunavut ... ....

Everything You’ll Need to Survive the Coming Apocalypse

Edit New York Magazine 31 Jul 2017

All week long, Vulture is exploring how dystopias have been imagined in popular culture.With the renewed fear of mutually assured destruction by nuclear weapons and Delaware-sized chunks of ice melting off of the polar ice caps, our culture has become obsessed with what will happen after the world ends. Whether ... More » ... ....

Principle above party / Reader Response

Edit Philadelphia Daily News 31 Jul 2017

... Otherwise, we will perpetuate the political polarity and non-action we now have in Congress....

30 July Polar Bear Cub explores Cub Kindy

Edit Public Technologies 31 Jul 2017

Polar Bear Cub explores Cub Kindy!. The three-month old Polar Bear Cub at Sea World has reached the next stage in her development and has started to explore Cub Kindy. Cub Kindy is a specially designed area at the world-class Polar Bear Shores exhibit which allows for the cub to develop her life-skills and explore new substrates such as shaved ice all under the watchful eye of doting mum, Liya....

Aurora

Polar

Geography

Places

People

Mathematics

Light (disambiguation)

Devices producing light

In religion

People

Places

Food or beverages

In music

Albums

National Geographic

See also

Northern Lights

Books

Films

Night of the Northern Lights

Relax Music & Stunning Aurora Borealis - Northern Polar Lights - 2 Hours - HD 1080P

Polar Lights - A Beautiful Escape (Official Audio)

Polar Lights - Into The Light (Official Music Video)

Polar Lights - A Murder Machine

Jaymes Young - Northern Lights

Spectacular Norway Northern Lights | National Geographic

Complete Build | Polar Lights Guillotine

Bosca - Outro/Polar Lights (prod. von Johnny Illstrument & Joznez)

Polar Lights blasts away their fans - "A Beautiful Escape"

Polar Lights

ALBUMS

Night of the Northern Lights

Relax Music & Stunning Aurora Borealis - Northern Polar Lights - 2 Hours - HD 1080P

Polar Lights - A Beautiful Escape (Official Audio)

Polar Lights - Into The Light (Official Music Video)

Polar Lights - A Murder Machine

Jaymes Young - Northern Lights

Spectacular Norway Northern Lights | National Geographic

Complete Build | Polar Lights Guillotine

Bosca - Outro/Polar Lights (prod. von Johnny Illstrument & Joznez)

Polar Lights blasts away their fans - "A Beautiful Escape"

Night of the Northern Lights

Relax Music & Stunning Aurora Borealis - Northern Polar Lights - 2 Hours - HD 1080P

Polar Lights - A Beautiful Escape (Official Audio)

Polar Lights - Into The Light (Official Music Video)

Polar Lights - A Murder Machine

Jaymes Young - Northern Lights

Spectacular Norway Northern Lights | National Geographic

Complete Build | Polar Lights Guillotine

Bosca - Outro/Polar Lights (prod. von Johnny Illstrument & Joznez)

Polar Lights blasts away their fans - "A Beautiful Escape"

Night of the Northern Lights

Relax Music & Stunning Aurora Borealis - Northern Polar Lights - 2 Hours - HD 1080P

Polar Lights - A Beautiful Escape (Official Audio)

Polar Lights - Into The Light (Official Music Video)

Polar Lights - A Murder Machine

Jaymes Young - Northern Lights

Spectacular Norway Northern Lights | National Geographic

Complete Build | Polar Lights Guillotine

Bosca - Outro/Polar Lights (prod. von Johnny Illstrument & Joznez)

Polar Lights blasts away their fans - "A Beautiful Escape"

Night of the Northern Lights

Relax Music & Stunning Aurora Borealis - Northern Polar Lights - 2 Hours - HD 1080P

Polar Lights - A Beautiful Escape (Official Audio)

Polar Lights - Into The Light (Official Music Video)

Polar Lights - A Murder Machine

Jaymes Young - Northern Lights

Spectacular Norway Northern Lights | National Geographic

Complete Build | Polar Lights Guillotine

Bosca - Outro/Polar Lights (prod. von Johnny Illstrument & Joznez)

Polar Lights blasts away their fans - "A Beautiful Escape"

Relax Music & Stunning Aurora Borealis - Northern Polar Lights - 2 Hours - HD 1080P

Polar Lights- [LIVE]- At Dimapur, Nagaland.

1:350 Scale Polar Lights USS Enterprise Kits and both lighting sets

Polar Nights & Northern Lights. Natural wonders and life in Murmansk Region with James Brown

◄Unboxing Delorean Retour vers le futur III ► POLAR LIGHTS

Polar Lights 1/350 Scale Enterprise Refit Buildup - The Finale

Aurora Borealis in 4K UHD: "Northern Lights Relaxation" Alaska Real-Time Video 2 HOURS

The Aurora Borealis Projector - Have Northern Polar Lights in your Room

Bob Ross - Northern Lights (Season 8 Episode 13)