An international team led by researchers from the Instituto de Astrofísica de Canarias (IAC) and the Universidad de La Laguna (ULL) has cataloged around 200 oscillations of the solar prominences during the first half of 2014
When we look at the surface of the Sun the solar prominences are seen as dark filaments that populate the disk or as a blaze of plasma above it. Solar prominences are very dense plasma structures that levitate in the solar atmosphere. It is generally believed that the star's magnetic field supports them so that they do not fall on the surface due to their own weight. These magnetic structures can accumulate a large amount of energy that, when released, produces eruptions ejecting the prominence material into the interplanetary space.
Image of the Sun from GONG telescopes network in Hα filter. Prominences are seen as dark filaments over the solar disk. The arrow indicates a prominence that oscillates. The diagram shows the horizontal velocity of the prominence. In the first phase of the oscillations, the velocity reaches the 60 km/s. The periodic motion persists during several hours.
Credit: Manuel Luna (IAC).
Manuel Luna, researcher at the IAC and the ULL, leads the team that has cataloged about 200 solar prominence oscillations detected in the first half of 2014. This analysis, published today in The Astrophysical Journal Supplement Series, has served to verify that almost half of these events have been of large-amplitude. That is, oscillations with speeds between 10 km/s (36000 km/h) and 100 km/s. It has also been proven that these large-amplitude events are more common than previously thought.
The project is part of an international collaboration that began in 2015 through the International Space Science Institute (ISSI) and also the NASA project for the study of this type of oscillations.
Thanks to this compilation, a large variety of events have been found and it has been determined that, in many cases, the oscillations are produced by nearby flares. That is, by the sudden release of energy in the solar atmosphere.
With the collected data, a statistical study of the properties of the oscillations has been carried out. These movements consist of a cyclic movement of the prominences between two positions. It has been seen in it, that the oscillations (vibrations) have a period of approximately one hour. These periods are a characteristic of the prominences and reveal fundamental properties of their magnetic structure and the distribution of their mass. In addition, the oscillations show a large damping, or what is the same the vibration is reduced considerably after few cycles of oscillation. It is unknown why most of the protuberances oscillate with a period of one hour or why their movement is damped so quickly, therefore it will be necessary to continue investigating.
The data suggest that "the direction of movement of the oscillations forms an angle of about 27 degrees with the main axis of the prominence," Luna explains. He adds: "This direction coincides with the previous estimates of the orientation of the magnetic field." In addition, using seismological techniques, researchers have been able to deduce details about the geometry and intensity of the magnetic field that supports the prominences.
This study opens a new window to the investigation of the structure of the solar prominences and to the mechanisms that eventually destabilize them producing their eruption. In the future, the authors want to extend this analysis to an entire solar cycle to understand the evolution of these structures over the 11 years it lasts. To achieve this, artificial intelligence and big-data processing techniques will have to be applied.
Prensa IAC | EurekAlert!
Researchers discover a system with three Earth-sized planets
08.06.2018 | Instituto de Astrofísica de Canarias (IAC)
Is there an end to the periodic table? MSU professor explores its limits
08.06.2018 | Michigan State University Facility for Rare Isotope Beams
An international team of scientists has discovered a new way to transfer image information through multimodal fibers with almost no distortion - even if the fiber is bent. The results of the study, to which scientist from the Leibniz-Institute of Photonic Technology Jena (Leibniz IPHT) contributed, were published on 6thJune in the highly-cited journal Physical Review Letters.
Endoscopes allow doctors to see into a patient’s body like through a keyhole. Typically, the images are transmitted via a bundle of several hundreds of optical...
Light detection and control lies at the heart of many modern device applications, such as smartphone cameras. Using graphene as a light-sensitive material for...
Water molecules exist in two different forms with almost identical physical properties. For the first time, researchers have succeeded in separating the two forms to show that they can exhibit different chemical reactivities. These results were reported by researchers from the University of Basel and their colleagues in Hamburg in the scientific journal Nature Communications.
From a chemical perspective, water is a molecule in which a single oxygen atom is linked to two hydrogen atoms. It is less well known that water exists in two...
The more electronics steer, accelerate and brake cars, the more important it is to protect them against cyber-attacks. That is why 15 partners from industry and academia will work together over the next three years on new approaches to IT security in self-driving cars. The joint project goes by the name Security For Connected, Autonomous Cars (SecForCARs) and has funding of €7.2 million from the German Federal Ministry of Education and Research. Infineon is leading the project.
Vehicles already offer diverse communication interfaces and more and more automated functions, such as distance and lane-keeping assist systems. At the same...
A research team led by physicists at the Technical University of Munich (TUM) has developed molecular nanoswitches that can be toggled between two structurally different states using an applied voltage. They can serve as the basis for a pioneering class of devices that could replace silicon-based components with organic molecules.
The development of new electronic technologies drives the incessant reduction of functional component sizes. In the context of an international collaborative...
08.06.2018 | Event News
05.06.2018 | Event News
28.05.2018 | Event News
08.06.2018 | Life Sciences
08.06.2018 | Physics and Astronomy
08.06.2018 | Physics and Astronomy