Navigation Links
Solar flares set the Sun quaking
Date:4/18/2008

Data from the ESA/NASA spacecraft SOHO shows clearly that powerful starquakes ripple around the Sun in the wake of mighty solar flares that explode above its surface. The observations give solar physicists new insight into a long-running solar mystery and may even provide a way of studying other stars.

The outermost quarter of the Suns interior is a constantly churning maelstrom of hot gas. Turbulence in this region causes ripples that criss-cross the solar surface, making it heave up and down in a patchwork pattern of peaks and troughs.

The joint ESA-NASA Solar and Heliospheric Observatory (SOHO) has proved to be an exceptional spacecraft for studying this phenomenon. Discovering how the ripples move around the Sun has provided valuable information about the Suns interior conditions. A class of oscillations called the 5-minute oscillations with a frequency of around 3 millihertz have proven particularly useful.

According to conventional thinking, the 5-minute oscillations can be thought of as the sound you would get from a bell sitting in the middle of the desert and constantly being touched by random sand grains, blown on the wind. But what Christoffer Karoff and Hans Kjeldsen, both at the University of Aarhus, Denmark, saw in the data, was very different.

The signal we saw was like someone occasionally walking up to the bell and striking it, which told us that there was something missing from our understanding of how the Sun works, Karoff says.

So they began looking for the culprit and discovered an unexpected correlation with solar flares. It seemed that when the number of solar flares went up, so did the strength of the 5-minute oscillations.

The strength of the correlation was so strong that there can be no doubt about it, says Karoff.

A similar phenomenon is known on Earth in the aftermath of large earthquakes. For example, after the 2004 Sumatra-Andaman Earthquake, the whole Earth rang with seismic waves like a vibrating bell for several weeks.

The correlation is not the end of the story. Now the researchers have to work to understand the mechanism by which the flares cause the oscillations. We are not completely sure how the solar flares excite the global oscillations, says Karoff.

In a broader context, the correlation suggests that, by looking for similar oscillations within other stars, astronomers can monitor them for flares. Already, Karoff has used high-technology instruments at major ground-based telescopes to look at other Sun-like stars. In several cases, he detected the tell-tale signs of oscillations that might originate from flares.

Now we need to monitor these stars for hundreds of days, he says. That will require dedicated spacecraft, such as the CNES mission with ESA participation, COROT. The hard work, it seems, is just starting.


'/>"/>

Contact: Bernhard Fleck
bfleck@esa.nascom.nasa.gov
301-286-4098
European Space Agency
Source:Eurekalert

Related biology news :

1. Nanotech could make solar energy as easy and cheap as growing grass
2. Smarter energy storage for solar and wind power
3. Hinode: new insights on the origin of solar wind
4. Nanowires hold promise for more affordable solar cells
5. Telecom research leads to solar cell breakthrough
6. Substantial improvement in essential cheap solar cell process
7. The future of solar-powered houses is clear
8. Popcorn-ball design doubles efficiency of dye-sensitized solar cells
Post Your Comments:
*Name:
*Comment:
*Email:
(Date:4/5/2017)... 2017 KEY FINDINGS The global ... a CAGR of 25.76% during the forecast period of ... factor for the growth of the stem cell market. ... MARKET INSIGHTS The global stem cell market is ... geography. The stem cell market of the product is ...
(Date:4/3/2017)... 3, 2017  Data captured by IsoCode, ... detected a statistically significant association between the ... treatment and objective response of cancer patients ... predict whether cancer patients will respond to ... well as to improve both pre-infusion potency testing ...
(Date:3/30/2017)... The research team of The Hong Kong Polytechnic University ... adopting ground breaking 3D fingerprint minutiae recovery and matching technology, pushing ... for use in identification, crime investigation, immigration control, security of access ... ... A research team led by Dr Ajay ...
Breaking Biology News(10 mins):
(Date:6/26/2017)... (PRWEB) , ... June 26, 2017 , ... Third Wave ... role of Sales Director, focused on leading new business development and ensuring quality customer ... of experience in the food ingredient industry in technical, marketing and sales roles. “Brett’s ...
(Date:6/23/2017)... (PRWEB) , ... June 23, 2017 , ... Ken Hanson, ... president of Physik Instrumente USA, have been selected as this year’s recipients of two ... The two have been invited along with other honorees to accept their awards at ...
(Date:6/22/2017)... ... June 21, 2017 , ... Building on the success of the inaugural RAADfest ... the very latest developments in radical life extension. RAADfest combines cutting edge science presented ... empowerment of personal development, making it the largest most comprehensive and inclusive super longevity ...
(Date:6/22/2017)... Linda, Ca (PRWEB) , ... June 22, 2017 , ... ... worldwide. It took 20 years until the first data on cross-contamination of human cell ... lines has been an increasing issue in cell culture labs and is associated with ...
Breaking Biology Technology: