Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

Violent truth behind Sun’s ‘Gentle Giants’ uncovered

10.02.2003


Solar Physicists at the Mullard Space Science Laboratory, University College London (MSSL-UCL) have discovered new clues to understanding explosions on the Sun.



Coronal mass ejections are violent explosions that can fling electrified gas [plasma] with a mass greater than Mount Everest towards the Earth with destructive consequences for satellites. They can originate from active regions on the Sun, long known to consist of forests of loops filled with plasma. These active loops are roughly 50,000 km in size. However, active regions on either side of the solar disk are frequently connected by giant loops, which can bridge the Sun’s equator. These loops have long been thought of as the gentle giants of the Sun, but in a paper to be published early this year in the journal of Astronomy and Astrophysics, the researchers describe the explosive characteristics of these giants.

An example of a giant loop can clearly be seen in figure one, where the width of the arrow represents the size of the Earth. These giant loops of plasma are 450,000 km long - large enough to engulf 40 Earths. If Concorde could fly along one of these loops, it would take nearly 9 days to complete the journey!


Coronal mass ejections are violent explosions that cause all sorts of effects from the destruction of satellites, to the creation of the aurora. These effects are commonly referred to as ’space weather’. Using data taken by the Yohkoh and SOHO satellites studying the Sun, the scientists analysed the giant loops to see how frequently they erupt. In the past only one eruption had been observed and so they have been considered the gentle giants of the Sun that do not explode. The researchers found that not only can these huge structures be thrown away from the Sun, but they can also be heated up by a factor of 5, to temperatures of 14 thousand times the temperature of boiling water. They investigated how the loops explode, and it was found that the longer the loop, the more likely it is to erupt - so these are culprits to watch more carefully in the future!

Alexi Glover, part of the space weather team at the European Space Agency [ESA], explains, "These huge loops have been observed for many years - but their connection with coronal mass ejections is only just being understood. In the future we hope to be able to predict coronal mass ejections before they take place, and step by step we are heading towards that goal."

Because of our increasing reliance on communication and navigation satellites for TV, GPS and national and international security, it is vital that we understand how the Sun can release these explosions.

Dr. Louise Harra of MSSL-UCL says, "Space weather is a rapidly developing field, and a vital key to progress is by understanding in detail the physics of Sun. The UK plays a leading role in solar physics and these new results are helping us make substantial advancements in our understanding of these beautiful, but potentially hazardous, coronal mass ejections."

Julia Maddock | alfa
Further information:
http://www.pparc.ac.uk/Nw/Press/giant_loops.asp

More articles from Physics and Astronomy:

nachricht Only an atom thick: Physicists succeed in measuring mechanical properties of 2D monolayer materials
17.01.2018 | Universität des Saarlandes

nachricht Black hole spin cranks-up radio volume
15.01.2018 | National Institutes of Natural Sciences

All articles from Physics and Astronomy >>>

The most recent press releases about innovation >>>

Die letzten 5 Focus-News des innovations-reports im Überblick:

Im Focus: Scientists decipher key principle behind reaction of metalloenzymes

So-called pre-distorted states accelerate photochemical reactions too

What enables electrons to be transferred swiftly, for example during photosynthesis? An interdisciplinary team of researchers has worked out the details of how...

Im Focus: The first precise measurement of a single molecule's effective charge

For the first time, scientists have precisely measured the effective electrical charge of a single molecule in solution. This fundamental insight of an SNSF Professor could also pave the way for future medical diagnostics.

Electrical charge is one of the key properties that allows molecules to interact. Life itself depends on this phenomenon: many biological processes involve...

Im Focus: Paradigm shift in Paris: Encouraging an holistic view of laser machining

At the JEC World Composite Show in Paris in March 2018, the Fraunhofer Institute for Laser Technology ILT will be focusing on the latest trends and innovations in laser machining of composites. Among other things, researchers at the booth shared with the Aachen Center for Integrative Lightweight Production (AZL) will demonstrate how lasers can be used for joining, structuring, cutting and drilling composite materials.

No other industry has attracted as much public attention to composite materials as the automotive industry, which along with the aerospace industry is a driver...

Im Focus: Room-temperature multiferroic thin films and their properties

Scientists at Tokyo Institute of Technology (Tokyo Tech) and Tohoku University have developed high-quality GFO epitaxial films and systematically investigated their ferroelectric and ferromagnetic properties. They also demonstrated the room-temperature magnetocapacitance effects of these GFO thin films.

Multiferroic materials show magnetically driven ferroelectricity. They are attracting increasing attention because of their fascinating properties such as...

Im Focus: A thermometer for the oceans

Measurement of noble gases in Antarctic ice cores

The oceans are the largest global heat reservoir. As a result of man-made global warming, the temperature in the global climate system increases; around 90% of...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

Event News

10th International Symposium: “Advanced Battery Power – Kraftwerk Batterie” Münster, 10-11 April 2018

08.01.2018 | Event News

See, understand and experience the work of the future

11.12.2017 | Event News

Innovative strategies to tackle parasitic worms

08.12.2017 | Event News

 
Latest News

Gran Chaco: Biodiversity at High Risk

17.01.2018 | Ecology, The Environment and Conservation

Only an atom thick: Physicists succeed in measuring mechanical properties of 2D monolayer materials

17.01.2018 | Physics and Astronomy

Fraunhofer HHI receives AIS Technology Innovation Award 2018 for 3D Human Body Reconstruction

17.01.2018 | Awards Funding

VideoLinks
B2B-VideoLinks
More VideoLinks >>>