Subscribe to our free daily newsletters
. 24/7 Space News .




Subscribe to our free daily newsletters



SOLAR SCIENCE
The sun's core makes a complete rotation in one week
by Staff Writers
Paris (SPX) Aug 09, 2017


Artist's impression of ESA and NASA's SOHO space observatory in orbit around the Sun (photograph taken by SOHO's EIT instrument (Extreme-ultraviolet Imaging Telescope) on 14 September 1999).

The rotation rate of the Sun's core has been accurately measured for the first time. The Sun, which has been remarkably stable for the past 4.6 billion years, is held together by the almost perfect equilibrium between the force of gravity, which tends to cause it to collapse, and the pressure of the thermonuclear reactions in its core.

Now, researchers working together with a team at the Laboratoire Lagrange (CNRS/Observatoire de la Cote d'Azur/Universite Nice Sophia Antipolis) have determined that the Sun's core makes a complete rotation once per week.

Using the GOLF instrument, orbiting around the Sun on board the SOHO space observatory, to measure solar oscillations, they developed a novel approach that enabled them to unambiguously detect gravity oscillation modes within our star. This work, which will certainly stimulate a new era of research into the physics of the solar core, is published in the journal Astronomy and Astrophysics.

The Sun, which has been remarkably stable for the past 4.6 billion years, is held together by the almost perfect equilibrium between the force of gravity, which tends to cause it to collapse, and the pressure of the thermonuclear reactions in its core.

The GOLF1 instrument, orbiting around the Sun on board the SOHO2 space observatory, measures solar oscillations, which carry information about the physical properties of its different layers. Every ten seconds, GOLF, which has been orbiting our star for over twenty years, records an integrated signal of oscillations of the solar surface.

Since these oscillations are particularly difficult to observe, the researchers used the GOLF data in a novel way, by making use of a differential parameter of the acoustic oscillation modes, which are observable at the surface.

This parameter measures the round trip time of acoustic waves traveling through the center of the Sun. The researchers detected the impact of gravity modes on them, thus demonstrating their existence.

The first result of this detection is that the researchers were able to accurately measure the mean rotation rate of the Sun's thermonuclear core, about which little was previously known. The core makes a complete rotation in one week, which is 3.8 times faster than the outer and intermediate layers.

This work should stimulate much research in solar physics, making it possible to further refine models of the Sun's birth, evolution, structure and chemical composition.

In particular, the gravity modes indicate that there is a region at the boundary of the thermonuclear core where the speed varies enormously, which is not predicted by the standard model of the Sun. It will also stimulate discussion about the nature of a possible magnetic field in the Sun's center.

Various teams analyze this flow of data with the aim of identifying the many oscillation modes exhibited by the Sun. Now, researchers from the Laboratoire Lagrange (CNRS/Observatoire de la Cote d'Azur/Universite Nice Sophia Antipolis), the Institut d'Astrophysique Spatiale (CNRS/Universite Paris-Sud), the Laboratoire Astrophysique, Interpretation, Modelisation (CNRS/Universite Paris Diderot/CEA), the Laboratoire d'Astrophysique de Bordeaux (CNRS/Universite de Bordeaux), the Instituto de Astrofisica de Canarias, and UCLA (University of California, Los Angeles) have successfully detected the Sun's gravity modes. These are similar to waves in which gravity is the restoring force, such as waves on the surface of the sea, although in the Sun they can only exist in its very deepest layers.

Research paper

SOLAR SCIENCE
Joint NASA-Brazil SPORT CubeSat mission will aid better space weather prediction
Huntsville AL (SPX) Aug 04, 2017
NASA and a team of Brazilian space researchers have announced a joint CubeSat mission to study phenomena in Earth's upper atmosphere - a region of charged particles called the ionosphere - capable of disrupting communications and navigation systems on the ground and potentially impacting satellites and human explorers in space. Two phenomena in the ionosphere - equatorial plasma bubbles an ... read more

Related Links
CNRS
Solar Science News at SpaceDaily


Thanks for being here;
We need your help. The SpaceDaily news network continues to grow but revenues have never been harder to maintain.

With the rise of Ad Blockers, and Facebook - our traditional revenue sources via quality network advertising continues to decline. And unlike so many other news sites, we don't have a paywall - with those annoying usernames and passwords.

Our news coverage takes time and effort to publish 365 days a year.

If you find our news sites informative and useful then please consider becoming a regular supporter or for now make a one off contribution.

SpaceDaily Contributor
$5 Billed Once


credit card or paypal
SpaceDaily Monthly Supporter
$5 Billed Monthly


paypal only

Comment using your Disqus, Facebook, Google or Twitter login.

Share this article via these popular social media networks
del.icio.usdel.icio.us DiggDigg RedditReddit GoogleGoogle

SOLAR SCIENCE
A look inside the Space Station's experimental BEAM module

Two Voyagers Taught Us How to Listen to Space

NASA Offers Space Station as Catalyst for Discovery in Washington

Voyager spacecraft still in communication 40 years out into the void

SOLAR SCIENCE
Space Launch System Solid Rocket Boosters 'on Target' for First Flight

Dragon to be packed with new experiments for International Space Station

ISRO Develops Ship-Based Antenna System to Track Satellite Launches

NASA taps BWXT for reactor design for future Mars missions

SOLAR SCIENCE
Five Years Ago and 154 Million Miles Away: Touchdown!

For Moratorium on Sending Commands to Mars, Blame the Sun

Tributes to wetter times on Mars

Opportunity will spend three weeks at current location due to Solar Conjunction

SOLAR SCIENCE
China develops sea launches to boost space commerce

Chinese satellite Zhongxing-9A enters preset orbit

Chinese Space Program: From Setback, to Manned Flights, to the Moon

Chinese Rocket Fizzles Out, Puts Other Launches on Hold

SOLAR SCIENCE
ASTROSCALE Raises a Total of $25 Million in Series C Led by Private Companies

LISA Pathfinder: bake, rattle and roll

Airbus DS to expand cooperation with Russia

UK space companies to develop international partnerships

SOLAR SCIENCE
BAE Systems reveals iMOTR radar system

Lockheed to intro radar demonstrator prototype

Algorithms that can sketch, recreate 3-D shapes

Ferroelectric phenomenon proven viable for oxide electrodes, disproving predictions

SOLAR SCIENCE
Unexpected life found at bottom of High Arctic lakes

NASA hiring a planetary protection officer to guard against alien invaders

Researchers detect exoplanet with glowing water atmosphere

Hubble detects exoplanet with glowing water atmosphere

SOLAR SCIENCE
Twilight observations reveal huge storm on Neptune

Jovian storm looms large in the Jupiter's High North

New Horizons Video Soars over Pluto's Majestic Mountains and Icy Plains

Juno spots Jupiter's Great Red Spot




Memory Foam Mattress Review
Newsletters :: SpaceDaily :: SpaceWar :: TerraDaily :: Energy Daily
XML Feeds :: Space News :: Earth News :: War News :: Solar Energy News






The content herein, unless otherwise known to be public domain, are Copyright 1995-2017 - Space Media Network. All websites are published in Australia and are solely subject to Australian law and governed by Fair Use principals for news reporting and research purposes. AFP, UPI and IANS news wire stories are copyright Agence France-Presse, United Press International and Indo-Asia News Service. ESA news reports are copyright European Space Agency. All NASA sourced material is public domain. Additional copyrights may apply in whole or part to other bona fide parties. All articles labeled "by Staff Writers" include reports supplied to Space Media Network by industry news wires, PR agencies, corporate press officers and the like. Such articles are individually curated and edited by Space Media Network staff on the basis of the report's information value to our industry and professional readership. Advertising does not imply endorsement, agreement or approval of any opinions, statements or information provided by Space Media Network on any Web page published or hosted by Space Media Network. Privacy Statement