[新聞] 五十年後到西伯利亞看極光
離人不挽
Earth's Magnetic Pole Drifting Quickly (http://hosted.ap.org/dynamic/stories/E/EARTH_MAGNETIC_POLE?SITE=WIJAN&SECTION=HOME&TEMPLATE=DEFAULT)
根據研究地球的磁場正快速的往西伯利亞移動中, 五十年後想要看極光就要到西伯利亞了.
根據研究地球的磁場正快速的往西伯利亞移動中, 五十年後想要看極光就要到西伯利亞了.
你的長相影響市容
科學家的確是有觀察到這樣的現象
磁北極正以40Km/yr的速度向北移動
那篇文章/讀者的解讀其實不是很精確，
基本上，西伯利亞現在就看得到極光了，主要是其北部靠近北極海的那一側
假設未來磁北極的移動速度不變，方向也不變的話，未來的二三十年，全球的極光帶都會向北移，對每個地方的觀賞都不利
假設這個移動持續往西伯利亞前進的話 (地球過去曾發生過好幾次，甚至還有磁南北極倒轉過)，最後極光帶就會偏向亞洲的中高緯地區 (而不是現在的美洲的中高緯地區)
也就是說，如果這個情形持續，五十年後(或100年後)，亞洲將成為觀察極光的好地方
依未來的磁北極位置而定，包括西伯利亞南部/蒙古國北部/中國(東北端)/哈薩客北部，都有可能有很高的機會看到極光
發生強烈的magnetic storm的時候，日本/韓國/中國也有機會
就像現在美國本土/加拿大南部的中緯度地區一樣，一年也看得到極光十來次
若干年後，磁北極還會再回到加拿大北部，基本上這是個複雜的循環
磁北極正以40Km/yr的速度向北移動
那篇文章/讀者的解讀其實不是很精確，
基本上，西伯利亞現在就看得到極光了，主要是其北部靠近北極海的那一側
假設未來磁北極的移動速度不變，方向也不變的話，未來的二三十年，全球的極光帶都會向北移，對每個地方的觀賞都不利
假設這個移動持續往西伯利亞前進的話 (地球過去曾發生過好幾次，甚至還有磁南北極倒轉過)，最後極光帶就會偏向亞洲的中高緯地區 (而不是現在的美洲的中高緯地區)
也就是說，如果這個情形持續，五十年後(或100年後)，亞洲將成為觀察極光的好地方
依未來的磁北極位置而定，包括西伯利亞南部/蒙古國北部/中國(東北端)/哈薩客北部，都有可能有很高的機會看到極光
發生強烈的magnetic storm的時候，日本/韓國/中國也有機會
就像現在美國本土/加拿大南部的中緯度地區一樣，一年也看得到極光十來次
若干年後，磁北極還會再回到加拿大北部，基本上這是個複雜的循環
香蕉你個不娜娜
原來的連結文章已不在了.不過網路上還是可以搜尋到其他網站的同樣文章.以下取自USToday報紙
http://www.usatoday.com/tech/science/discoveries/2005-12-08-magnetic-pole-shift_x.htm
Earth's magnetic pole drifting quickly
By Alicia Chang, Associated Press
Posted 12/8/2005 8:58 PM
SAN FRANCISCO — Earth's north magnetic pole is drifting away from North America and toward Siberia at such a clip that Alaska might lose its spectacular Northern Lights in the next 50 years, scientists said Thursday.
Despite accelerated movement over the past century, the possibility that Earth's modestly fading magnetic field will collapse is remote. But the shift could mean Alaska may no longer see the sky lights known as auroras, which might then be more visible in more southerly areas of Siberia and Europe.
The magnetic poles are part of the magnetic field generated by liquid iron in Earth's core and are different from the geographic poles, the surface points marking the axis of the planet's rotation.
Scientists have long known that magnetic poles migrate and in rare cases, swap places. Exactly why this happens is a mystery.
"This may be part of a normal oscillation and it will eventually migrate back toward Canada," Joseph Stoner, a paleomagnetist at Oregon State University, said Thursday at an American Geophysical Union meeting.
Previous studies have shown that the strength of the Earth's magnetic shield has decreased 10% over the past 150 years. During the same period, the north magnetic pole wandered about 685 miles out into the Arctic, according to a new analysis by Stoner.
The rate of the magnetic pole's movement has increased in the last century compared to fairly steady movement in the previous four centuries, the Oregon researchers said.
At the present rate, the north magnetic pole could swing out of northern Canada into Siberia. If that happens, Alaska could lose its Northern Lights, which occur when charged particles streaming away from the sun interact with different gases in Earth's atmosphere.
The north magnetic pole was first discovered in 1831 and when it was revisited in 1904, explorers found that the pole had moved 31 miles.
For centuries, navigators using compasses had to learn to deal with the difference between magnetic and geographic north. A compass needle points to the north magnetic pole, not the geographic North Pole. For example, a compass reading of north in Oregon is about 17 degrees east of geographic north.
In the study, Stoner examined the sediment record from several Arctic lakes. Since the sediments record the Earth's magnetic field at the time, scientists used carbon dating to track changes in the magnetic field.
They found that the north magnetic field shifted significantly in the last thousand years. It generally migrated between northern Canada and Siberia, but it sometimes moved in other directions, too.
http://www.usatoday.com/tech/science/discoveries/2005-12-08-magnetic-pole-shift_x.htm
Earth's magnetic pole drifting quickly
By Alicia Chang, Associated Press
Posted 12/8/2005 8:58 PM
SAN FRANCISCO — Earth's north magnetic pole is drifting away from North America and toward Siberia at such a clip that Alaska might lose its spectacular Northern Lights in the next 50 years, scientists said Thursday.
Despite accelerated movement over the past century, the possibility that Earth's modestly fading magnetic field will collapse is remote. But the shift could mean Alaska may no longer see the sky lights known as auroras, which might then be more visible in more southerly areas of Siberia and Europe.
The magnetic poles are part of the magnetic field generated by liquid iron in Earth's core and are different from the geographic poles, the surface points marking the axis of the planet's rotation.
Scientists have long known that magnetic poles migrate and in rare cases, swap places. Exactly why this happens is a mystery.
"This may be part of a normal oscillation and it will eventually migrate back toward Canada," Joseph Stoner, a paleomagnetist at Oregon State University, said Thursday at an American Geophysical Union meeting.
Previous studies have shown that the strength of the Earth's magnetic shield has decreased 10% over the past 150 years. During the same period, the north magnetic pole wandered about 685 miles out into the Arctic, according to a new analysis by Stoner.
The rate of the magnetic pole's movement has increased in the last century compared to fairly steady movement in the previous four centuries, the Oregon researchers said.
At the present rate, the north magnetic pole could swing out of northern Canada into Siberia. If that happens, Alaska could lose its Northern Lights, which occur when charged particles streaming away from the sun interact with different gases in Earth's atmosphere.
The north magnetic pole was first discovered in 1831 and when it was revisited in 1904, explorers found that the pole had moved 31 miles.
For centuries, navigators using compasses had to learn to deal with the difference between magnetic and geographic north. A compass needle points to the north magnetic pole, not the geographic North Pole. For example, a compass reading of north in Oregon is about 17 degrees east of geographic north.
In the study, Stoner examined the sediment record from several Arctic lakes. Since the sediments record the Earth's magnetic field at the time, scientists used carbon dating to track changes in the magnetic field.
They found that the north magnetic field shifted significantly in the last thousand years. It generally migrated between northern Canada and Siberia, but it sometimes moved in other directions, too.