[Video] If we look back at the 25 SOHO's last years 2020, this represents 25 years of good and sincere service from the Solar Observatory, of the NASA heliosphere and the European Space Agency: SOHO here is a compilation!

After leaving for a mission of less than three years, today's famous SOHO Solar Energy and Heliosphere Observatory, 2 December 2020, the 25th anniversary of its launch It should continue its mission until 2022 if we look back on some of the highlights of recent years

The 2 December 1995, the heliosphere and the heliosphere – by his little name Soho – took off from Cape Canaveral and headed for the sun and embarked on twelve instruments for a mission that was to last three years at most, more 25 years later, eight of them are still The tools regularly transmit data to astronomers, data of inestimable scientific value.

In these pictures, the sun presented itself to a Soho photographer in ultraviolet rays every spring between 1996 and 2017 images revealing the crown of our star, an atmosphere that can reach 2 millions of degrees Celsius and spanning millions of kilometers. © Soho, THAT, It's in

for example, Soho is the first to have had the opportunity to closely follow the activity of the Sun for more than a full cycle of 22 years because yes, if we are generally talking about sunspot cycles of about 11 years, then after 22 n the magnetic field of our star will return to Its initial direction This one, in fact, gradually drift, until it capsizes after 11 years, overturning the northern and southern hemispheres. And you have to wait for a second inversion to complete a magnetic cycle

The 30 mars 2001, the largest dark spot on the surface of the Sun has appeared. At the moment, our star was near the maximum activity cycle 23 © THAT, It's in, Soho

For a few weeks now, Sohu is the perfect spectator of the resumption of the sun's activity, and it officially entered its twenty-fifth session at the end of October. The probe presented us with the most spectacular images of the explosion of 2012, thanks to the intervention of an algorithm combining images from two of its devices Put astronomers in the front row to witness a series of coronal mass ejection (CME)

The #Sun Sun started the fireworks early in memory of # SOHO25 with this mind-blowing coronal mass ejection recorded on Sunday The latest SOHO shows are still available here https: // t Share / TMG231jiZXpic Twitter com / fJFFNrcFYv

«This is certainly the most important result obtained by Sohu in the 10 last years.» With all the metrics that set them apart, NASA astronomers, in August 2017, presented the work that was done using golf instrument data – for global oscillation at low frequencies – On board the probe, this measures the speed of the sun's surface movement, his data, patiently accumulated and processed over the years, finally allow to discover the surface imprint of deep waves. It is enough to estimate that the core of our star turns four times faster than its surface

Originally designed for a two year assignment, Sohu's office has since observed two solar cycles of 11 years as solar activity decreases and the solar cycle fades 25 wakes up on the 25th anniversary of the founding of SOHO! # SOHO25 https: // t Share / t69ZCa5CGbpic Twitter com / pzA6ADraFm

While the objective of the Soho mission was to study the internal structure of the sun as well as the winds and the sun's corona, the probe also provided other invaluable and unexpected information with invaluable help from citizen scientists who worked tirelessly to explore the images Soho had sent to Earth.

# Space // Former UGrenobleAlpes student discovers one culprit! 4000 discovered by the Solar and Heliosphere Observatory (SOHO) Trygve Prestgard graduated with a master's degree in geophysics IPAG_en Read the article (IN) esahttps: // tco / szYDYGbCu5 # CitizenSciencepic Twitter com / OS5RKfjbEz

In June 2020, the probe ejected no less than 4000 grazing comets – a Sungrazer comet as the English speakers say – not very bright and undetectable from Earth. The comet has appeared – like others before her – notably thanks to the convenient location of Soho and the Eclipse. Sun prosthesis created with a wide angle crown diagram

Comets are icy bodies that lose part of their mass as they approach the sun. These last years, Soho witnessed, Many times, the sublimation of comets that have been slightly exposed to the heat of our star.

After the series of discussions “Top 5” from yesterday, here are some random comet movies @ ESA / @ NASA SOHO from the last decade, starting with this cute group photo of Kreutz from August 2016, Twitter com / reSRQ2WP2l

In August 2016, NASA released an animation showing a comet disappearing behind the sun and never appearing on the other side again

The Solar and Heliosphere Observatory (SOHO) from NASA / ESA captured these images of comet Kreutz sungrazer on 15 August 2019 https: // t Share / 0iG9b2nFqqpic Twitter com / 4KAqNNxvWs

Three years later, this time a comet sinking directly into our sun which was surprised by a comet Soho, like the majority of the fly, it would have originated from the fragmentation of a comet nucleus several thousand years ago called X / 1106 C1, comets of the Kreutz group / p>

In 2018, le Stanford Laboratory for Experimental Physics (USA) recorded audio data from Soho, literally indicating the natural vibrations of the sun to astronomers, giving them a concrete representation of the dynamics of the atmosphere.”We don't have easy ways to look inside the sun”, a déclaré Alex Young, researcher at Goddard Space Flight Center, in a statement released by NASA Using the vibrations of the sun allows us to see what's inside. »

During the summer 2020, some thought Soho had surprised a spaceship in front of our sun because the images from the probe showed a mysterious black square on our star, but the heads of mission quickly put an end to the wildest speculations. The black square in question is simply a missing telemetry block due to an error in Transmission between Soho and our Earth

Some photos of Soho were delivered by NASA before processing and you might surprise those who see them with a strange black square © SoHO, THAT, It's in

The 2 December 2015, NASA and ESA celebrated the twentieth anniversary of the launch of SOHO This satellite dedicated exclusively to the study of our star and its environment has shed light on physicists on various mysteries related to its internal structure, its surface and its crown With 5000 publications related to these observations of almost two cycles of activity, scientists were able to build a more complete picture of the solar star.

Illustration of Sohu superimposed on an image of our star taken by satellite on 14 September 1999 using the EIT tool (Ultraviolet Imaging Telescope) That day, there was a giant wrist-shaped projection that was growing on the edge of the sun Next, it will start the peak activity of the cycle 23 © Soho, That, Nasa et ATG medialab

Twenty years ago, the 2 December 1995, SOHO (heliosphere and heliosphere) left Earth to go and stand at a distance of 1A 5 millions of kilometers of the latter to constantly spy on our star and its environment The least that can be said is that this mission linking NASA and the space agency since its inception has enabled the physics of the Sun (or the physics of the Sun) to take big steps forward. His instruments actually photographed a dynamic star – which contrasts with the usual still image of astronomers until then – and allowed us to better characterize his guts, the activity on its surface, without forgetting the mystery The crown of the heliosphere was observed thanks to the diagrams of Soho, that create an artificial eclipse

Apart from the power failure of 4 months in 1998, when the probe was almost lost due to a software bug, Soho has been the distinct and constant witness over the past two decades, the activity that triggered two solar cycles (cycle 23 and current cycle 24 which appear to be in decline His grades have been the subject of more than 5 000 scientific papers.

Moreover, it should be noted that the satellite is also known as the “greatest comet hunter of all time” (according to NASA) last september, the expedition teams celebrated 3 000 discoveries, most of which were captured diving into this star of 330 blocs 000 times bigger than Earth, home of the solar system

In this image taken on 18 February 2003, the Sun masked by a SOHO corona diagram (the blue disk of the image) expelled millions of charged particles into the planetary medium (coronal mass ejection) at the same time, via comet NEAT ( Comet NEAT), discovered in 2002, this field of observation is one of the 15 photos that NASA selected for the competition. You can vote for your favorites here. © Soho, That, It's in

Since the launch of the Soho satellite, Knowledge of the sun has progressed well and we now better measure the effects of its activity on our environment, especially when fluctuations in the solar wind intensify and coronal mass ejections (CME) happen in our direction, causing auroras and sometimes geomagnetic storms that could affect our technological infrastructure on Earth and in orbit. The implications were previously underestimated, and with SOHO (more than 20000 CME have been studied in 20 years), physicists have learned that it is more frequent and variable during the cycle than they thought revealed. Observations of ultraviolet radiation have also reported hitherto unpredictable tsunami waves that have accumulated above the surface, in conjunction with CMEs, at several million kilometers per hour.”Thanks to Sohu, comments Joe Gorman, member of the GSFC mission (Goddard Space Flight Center), more and more people realize that we live in the long atmosphere of a magnetically active star”

Three objectives presided over the accomplishment of this mission which reminded us of NASA in its first press release linked to the internal structure of our star. The researchers wanted to verify their model of what happens inside a dwarf yellow like our sun, using sun science, and understand, for example, why solar neutrinos were intercepted. On earth, there are less than expected by theory in fact, this stems in particular from a misunderstanding about the nature of these supposed massless particles, like research into the famous Nobel Prize winning neutrino oscillation mystery 2015 for Arthur B. MacDonald et Takaki Kajita

A composite image of up close 20 full years of observation of the Sun by SOHO In these extreme ultraviolet ray satellite images, we can see changes in activity on the star's surface over time The cycle 23 ended around 2006-2007 and we are currently in Maximum of 24 cycles © Soho, Esa and Nasa

Another question that occupied physicists in 1995 and is now better understood: the acceleration of the solar wind far from being constant and equal in all points, this flow is most intense in areas called coronal holes in the crown, in fact, This is the third big puzzle that attempts How to explain that by moving tens of thousands of kilometers from the star's surface, the photosphere, where the temperature of the Sun is around 5900 degrees Celsius, suddenly got hundreds of times hotter? The problem is not resolved yet, but some tracks have been advanced (see «The solar crown heating puzzle finally solved?») It will belong to the future Solar Probe Plus mission, which must be launched in 2018, to enlighten us on the subject

«Sans Soho, there would be no SDO missions, Stereo, Iris and Hinode», explique Alex Young, GSFC researcher. Soho showed us things we haven't seen before, then we realized we needed more eyes on the sun », concludes Bernard Fleck. He is also a member of the expedition, until: “Soho changed the popular view of the Sun from the image of a fixed, unchanging body in the sky to the dynamic beast that is truly”

Giant spots and rashes: the sun is losing its calm

Solar and Heliospheric Observatory, Star, Comet, Soleil, NASA, Observation

News – FR – Sohu a 25 years: His greatest discoveries and his most beautiful photos

Source: https://www.futura-sciences.com/sciences/actualites/soleil-soho-25-ans-plus-grandes-decouvertes-plus-belles-images-60717/

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