Featured Research

from universities, journals, and other organizations

Surprisingly Rapid Changes In Earth’s Core Discovered

Date:
June 20, 2008
Source:
Technical University of Denmark
Summary:
The movements in the liquid part of the Earth's core are changing surprisingly quickly, and this affects the Earth's magnetic field, according to new research.

Ørsted magnetometer measurements form the base for the latest International Geomagnetic Reference Field, the IGRF2000. A graphical representation of the total magnetic field strength at the Earth's surface inferred from the IGRF2000 is shown below. The blueish-black range of colors represents a field strength above the mean field at the surface and the reddish-yellow range a field strength below the mean field.
Credit: Image courtesy of Danish Meteorological Institute

The movements in the liquid part of the Earth’s core are changing surprisingly quickly, and this affects the Earth’s magnetic field, according to new research from DTU Space.

Related Articles


The Ørsted satellite’s very precise measurements of the Earth’s magnetic field over the past nine years have made it possible for Nils Olsen, Senior Scientist with DTU Space, and several German scientists, to map surprisingly rapid changes in the movements in the Earth’s core. The results have just been published in the scientific journal Nature Geoscience.

“What is so surprising is that rapid, almost sudden, changes take place in the Earth’s magnetic field. This suggests that similar sudden changes take place in the movement of the liquid metal deep inside the Earth which is the reason for the Earth’s magnetic field,” Nils Olsen explains.

The Earth’s core consists of an inner solid core which is surrounded by an outer liquid core approx. 3,000 km below our feet. Both the liquid core and the solid core consist primarily of iron and nickel, and it is the movements in the outer liquid part of the Earth’s core which create the Earth’s magnetic field. Changes in these movements are seen as changes in the magnetic field, and scientists can therefore use satellite measurements of the magnetic field to find out what is going on in the liquid core deep inside the Earth.

Scientists from DTU Space and other institutions are currently preparing a joint European successor to the Ørsted satellite by the name of Swarm. The Swarm mission consists of three satellites, which will be measuring the Earth’s magnetic field even more accurately than the Ørsted satellite.

“By combining the Swarm and Ørsted magnetic measurements we hope to find out the reason for the-se rapid movements in the core,” Nils Olsen concludes.


Story Source:

The above story is based on materials provided by Technical University of Denmark. Note: Materials may be edited for content and length.


Journal Reference:

  1. Olsen et al. Rapidly changing flows in the Earth’s core. Nature Geoscience, 2008; 1 (6): 390 DOI: 10.1038/ngeo203

Cite This Page:

Technical University of Denmark. "Surprisingly Rapid Changes In Earth’s Core Discovered." ScienceDaily. ScienceDaily, 20 June 2008. <www.sciencedaily.com/releases/2008/06/080619102553.htm>.
Technical University of Denmark. (2008, June 20). Surprisingly Rapid Changes In Earth’s Core Discovered. ScienceDaily. Retrieved October 24, 2014 from www.sciencedaily.com/releases/2008/06/080619102553.htm
Technical University of Denmark. "Surprisingly Rapid Changes In Earth’s Core Discovered." ScienceDaily. www.sciencedaily.com/releases/2008/06/080619102553.htm (accessed October 24, 2014).

Share This



More Earth & Climate News

Friday, October 24, 2014

Featured Research

from universities, journals, and other organizations


Featured Videos

from AP, Reuters, AFP, and other news services

Dances With Wolves in China's Wild West

Dances With Wolves in China's Wild West

AFP (Oct. 23, 2014) — One man is on a mission to boost the population of wolves in China's violence-wracked far west. The animal - symbol of the Uighur minority there - is under threat with a massive human resettlement program in the region. Duration: 00:41 Video provided by AFP
Powered by NewsLook.com
San Diego Zoo's White Rhinos Provide Hope for the Critically Endangered Species

San Diego Zoo's White Rhinos Provide Hope for the Critically Endangered Species

Reuters - Light News Video Online (Oct. 22, 2014) — The pair of rare white northern rhinos bring hope for their species as only six remain in the world. Elly Park reports. Video provided by Reuters
Powered by NewsLook.com
Trick-or-Treating Banned Because of Polar Bears

Trick-or-Treating Banned Because of Polar Bears

Buzz60 (Oct. 21, 2014) — Mother Nature is pulling a trick on the kids of Arviat, Canada. As Mara Montalbano (@maramontalbano) tells us, the effects of global warming caused the town to ban trick-or-treating this Halloween. Video provided by Buzz60
Powered by NewsLook.com
Traditional Farming Methods Gaining Ground in Mali

Traditional Farming Methods Gaining Ground in Mali

AFP (Oct. 20, 2014) — He is leading a one man agricultural revolution in Mali - Oumar Diatabe uses traditional farming methods to get the most out of his land and is teaching others across the country how to do the same. Duration: 01:44 Video provided by AFP
Powered by NewsLook.com

Search ScienceDaily

Number of stories in archives: 140,361

Find with keyword(s):
 
Enter a keyword or phrase to search ScienceDaily for related topics and research stories.

Save/Print:
Share:  

Breaking News:

Strange & Offbeat Stories

 

Plants & Animals

Earth & Climate

Fossils & Ruins

In Other News

... from NewsDaily.com

Science News

Health News

Environment News

Technology News



Save/Print:
Share:  

Free Subscriptions


Get the latest science news with ScienceDaily's free email newsletters, updated daily and weekly. Or view hourly updated newsfeeds in your RSS reader:

Get Social & Mobile


Keep up to date with the latest news from ScienceDaily via social networks and mobile apps:

Have Feedback?


Tell us what you think of ScienceDaily -- we welcome both positive and negative comments. Have any problems using the site? Questions?
Mobile iPhone Android Web
Follow Facebook Twitter Google+
Subscribe RSS Feeds Email Newsletters
Latest Headlines Health & Medicine Mind & Brain Space & Time Matter & Energy Computers & Math Plants & Animals Earth & Climate Fossils & Ruins