The mission Rosetta of the European Space Agency (ESA, in English) is living more than ever, despite its suicide & # 39; in September 2016 by making uncontrolled landing on his kite study, 67P / Churyumov-Gerasimenko (67P / CG). So it is not now active. If at the beginning of October, the search engine gave us new image of the kite of your study, now the satellite brings us a new discovery.
One of the main objectives of ESA was to study plasma, because they needed to have Rosetta to see a River stars in the Comet of 67P. However, although researchers looked, they could not find it. In space trips these situations can occur: you expect to find a phenomenon to be able to study, but you do not see it. Despite this, the mission has not been considered a failure, vice versa, the auditor has provided much information about comedy and space. However, according to a new study of data, Rosetta hit the arc shock, one that was in its initial period and therefore was not noticed at the beginning, as explained by the ESA in a press release.
For two years, Rosetta seen with patience the 67P comet "from different perspectives", stating the European agency, and although no one was noticed, the shock arch crossed several times. Thanks to this, the search engine did "measurements on the site of this mysterious part of space".
But what's this from the shock arch? One of the best ways scientists have to study plasma and Solar System are comets. "Plasma is a fastest hot and gaseous issue that includes particles raised and the Solar System is in the form of a solar wind, a constant flow of particles that our star turns into space," they can explain from the ESA. Currently when the solar wind "passes to objects such as planets or smaller bodies, first it hit the so-called arc on the effect", they state. That is, this phenomenon could be compared to the wave that forms around a ship's bank while stealing incredible waters, "said the European agency.
67P is not the only spot where a shock blade was seen. Halley has also been able to climb. "Plasma phenomena they vary as the medium interacts with the surrounding environment and changes the size, shape and nature of structures such as shock arches over time, "they explain.
Nearer to the core than expected
Between 2014 and 2016, Rosetta's mission was looking for signs of this phenomenon and "ventured more than 1,500 kilometers away from the center of comet looking for large-scale comet terminals" and in the first place all the effort seemed to have been useless. But when reviewing the data they've got, finally.
"We were looking for a There is a typical cake in the area where one could expect, far from the comet's kernel, but we did not find anything, so we came to the conclusion that Rosetta had not been able to find it, "explained Herbert Gunell, the Royal Institute of Aerospace of Belgium and Umeå University (Sweden) , one of the two scientists who has led the study. "However, that seems the scanner found a shock shock, but it was in his early stages. During a new analysis of the data, we found some 50 times closer to the kernel of the comet or expectation in a case like 67P. He also moved in a way we did not expect, and that's why we did not see it first ".
there are two key dates when observing a shock shock by Rosetta. The first data comes from March 7, 2015, 67P was twice as Sun and Earth as it goes to the star, "Rosetta data showed signs that shock arc is beginning to form" , point of space agency. The following data comes from February 24, 2016, when the comet was not off star.
And now researchers have realized that "this limit disproportionate and fully developed shock surfaces found in other comets ", indicating the ESA.
"Rosetta fu & # 39; r first to hold such an early stage of development from comet shock ", notes Charlotte Goetz, from the Institute of Additional Geophysics and Physics Braunschweig (Germany) and co-author of the study." The arc developed in formats found in the 2015 data until it reached it full development when the comet goes to the Sun and increases its activity; however, we could not see this in the Rosetta data because at that time the search engine was too close to 67P to find the arc adult. When Rosetta was caught again, in 2016, the comedy moved away from the Sun, so the arc found at that point was in the same state, rather than forming it was abolished"he added.
What is Rosetta?
ESA's mission was sent in 2004 to a 67P Comet with the intention of "observing it", studying the gas and dust surrounding it, and explore your plasma environment", according to ESA.
To achieve this work, the auditor had Up to 11 scientific instruments (among them, a set of instruments formed by five different sensors to study the plasma that surround the comet) all for more about comedy and also for the origin of the System Solar. Herbert, Charlotte and their fellow researchers investigated the data collected by the Rosetta Plasma Consortium and "They combined the data with a plasma model to simulate the comet interactions with the solar wind and to set the properties of the shock arc, "collect ESA.