HOME >> BIOLOGY >> NEWS
3.2 billion-year-old surprise: Earth had strong magnetic field

Geophysicists at the University of Rochester announce in todays issue of Nature that the Earths magnetic field was nearly as strong 3.2 billion years ago as it is today.

The findings, which are contrary to previous studies, suggest that even in its earliest stages the Earth was already well protected from the solar wind, which can strip away a planets atmosphere and bathe its surface in lethal radiation.

The intensity of the ancient magnetic field was very similar to todays intensity, says John Tarduno, professor of geophysics in the Department of Earth and Environmental Sciences at the University of Rochester. These values suggest the field was surprisingly strong and robust. Its interesting because it could mean the Earth already had a solid iron inner core 3.2 billion years ago, which is at the very limit of what theoretical models of the Earths formation could predict.

Geophysicists point to Mars as an example of a planet that likely lost its magnetosphere early in its history, letting the bombardment of radiation from the sun slowly erode its early atmosphere. Theories of Earths field say its generated by the convection of our liquid iron core, but scientists have always been curious to know when Earths solid inner core formed because this process provides an important energy source to power the magnetic field. Scientists are also interested in when Earths protective magnetic cocoon formed. But uncovering the intensity of a field 3.2 billion years in the past has proven daunting, and until Tardunos research, the only data scientists could tease from the rocks suggested the field was perhaps only a tenth as strong as todays.

Tarduno had previously shown that as far back as 2.5 billion years ago, the field was just as intense as it is today, but pushing back another 700 million years in time meant he had to find a way to overcome some special challenges. '"/>

Contact: Jonathan Sherwood
jonathan.sherwood@rochester.edu
585-273-4726
University of Rochester
4-Apr-2007


Page: 1 2 3

Related biology news :

1. What we can learn from the biggest extinction in the history of Earth
2. Chickens also orient themselves by the Earths magnetic field
3. Scientists ponder plant life on extrasolar Earthlike planets
4. NASA-funded robotic sub makes final dive to reach bottom of Earths deepest sinkhole
5. ESA presents the sharpest ever satellite map of Earth
6. Prototype space probe prepares to explore Earths deepest sinkhole
7. Worlds oldest rocks show how Earth may have dodged frozen fate of Mars
8. Climate change only one symptom of a stressed planet Earth
9. Researchers identify a heartbeat in Earths climate
10. Symposium Changes on Earth honors Yale Geologist Robert Berner
11. The Milky Way shaped life on Earth

Post Your Comments:
*Name:
*Comment:
*Email:


(Date:8/12/2020)... (PRWEB) , ... August 12, 2020 , ... ... and monitoring systems that are ideal for public health agencies of all sizes. ... contagious diseases and helping at-risk individuals find appropriate health care, Mosio helps public ...
(Date:8/7/2020)... Ky. (PRWEB) , ... August 06, 2020 , ... ... selected to participate in the prestigious National STEM Scholar Program, a unique professional ... network building, and project support for middle school science teachers nationwide. , Created ...
(Date:8/3/2020)... ... August 03, 2020 , ... Accumen ... partnership with medical equipment manufacturer, Spectrum Solutions, to provide COVID-19 saliva testing kits ... laboratory supply chain for more than 10 years. Early in the COVID-19 crisis, ...
Breaking Biology News(10 mins):
(Date:7/18/2020)... ... 16, 2020 , ... After research model surgery and catheter implantation, the long ... only the beginning of a successful study, while protecting and accessing the catheter or ... Head of Surgery from Envigo in a live webinar on ...
(Date:7/18/2020)... TORONTO (PRWEB) , ... July 17, 2020 , ... ... and global consulting firm for the life sciences and food industries, is pleased ... new Director of Clinical Research – Business Development. , Charles is an accomplished ...
(Date:7/10/2020)... ... July 09, 2020 , ... In most ... used to suppress pigment formation in zebrafish embryos, maintaining optical transparency to facilitate ... Dr MA has been using the zebrafish model to investigate the causes of ...
(Date:7/7/2020)... , ... July 06, 2020 , ... ... Awards. Entries from Roche, Eli Lilly, Bristol-Myers Squibb, the University of Chicago, Massachusetts ... Bio-IT World has hosted an elite awards program, highlighting outstanding examples of how ...
Breaking Biology Technology:
Cached News: